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accepted_inspectors
string
exemptions
string
governing_body
string
id
string
low_pressure_boiler_interval
string
power_boiler_interval
string
pressure_vessel_interval
string
source
string
source_quote
string
state
string
statute_citation
string
url
string
verified_fields
list
also_reported
list
disagreements
list
State deputy inspectors; insurance company inspectors holding a Certificate of Competency issued by the Secretary of Labor
Boilers and pressure vessels under federal control or under regulations of Title 49 of the Code of Federal Regulations, Parts 192 and 193; pressure vessels used for transportation and storage of compressed liquefied gases per US DOT specs; pressure vessels on vehicles under other state or federal authorities; air tanks...
Alabama Department of Workforce
alabama
one biennial inspection with an internal inspection every four years
one annual internal and external inspection
one biennial inspection with an internal inspection at the discretion of the inspector
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Wiggins, Jr., Director of Inspections, Chief Inspector Alabama Department of Workforce 50 N Ripley Street Montgomery, AL 36131 Telephone — 334.956.7412 Email — edward.wiggins@workforce.alabama.gov Fax ­— 334.956.7405 EMPOWERMENT Boiler Board: Yes. (Contact above official for more information.) DAT...
Alabama
Alabama State Statutes, Title 25. Labor, Chapter 12. The Boiler and Pressure Vessel Safety Act , Sections 25.12.1 through 25.12.22.
https://referencesource.org/boiler-inspection-requirements-by-state/alabama/
[ "governing_body", "state", "statute_citation" ]
null
null
Department inspector; insurance company inspectors (inspections accepted in lieu of department inspector); special inspector commission may be issued to insurance inspectors or owner/user inspectors holding a Certificate of Competency or commission issued by a state that has adopted the ASME Code
Boilers and unfired pressure vessels under federal regulation; unfired pressure vessels meeting US DOT requirements for shipment; air tanks on vehicles under other state authorities; air tanks on railroad rights-of-way; unfired pressure vessels of 5 cubic feet or less or inside diameter not exceeding 6 inches; unfired ...
Alaska Department of Labor and Workforce Development, Mechanical Inspection Section
alaska
certificate inspection every two years with an internal inspection every four years if construction permits
certificate inspection annually; external inspection while under pressure, or internal inspection as warranted
inspected internally and externally at intervals set by the Department of Labor and Workforce Development
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Alaska Statutes Title 18, Chapter 60 Boilers and Unfired Pressure Vessels 18.60.180 RULES FOR CONSTRUCTION AND STAMPING Construction:
Alaska
Alaska Statutes Title 18, Chapter 60 Boilers and Unfired Pressure Vessels 18.60.180
https://referencesource.org/boiler-inspection-requirements-by-state/alaska/
[ "state", "statute_citation" ]
null
null
Third party inspectors employed by National Board or ASME accredited companies and issued a special inspection certificate by the chief boiler inspector, accepted per A.R.S. 23-485
Boilers, lined hot water heaters and pressure vessels regulated by the US government; boilers, lined hot water heaters and pressure vessels located in private residences, or apartment complexes less than six units; boilers, lined hot water heaters and pressure vessels operated on Indian reservations; lined (potable) ho...
Industrial Commission of Arizona, Department of Safety and Health, Boiler & Elevator Safety Sections
arizona
certificate inspection every two years; internal inspection where construction permits
annual internal certificate inspection and an external inspection while under operating conditions; triennial (36-month) internal inspection and annual external inspection when fully attended by qualified attendants per Arizona Boiler Rule, R20-5-408(C)
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Arizona Revised Statutes, Title 23. Labor, Article 11. Arizona Boiler Act , Sections 471 through 488. RULES FOR CONSTRUCTION AND STAMPING Construction:
Arizona
Arizona Revised Statutes, Title 23. Labor, Article 11. Arizona Boiler Act , Sections 471 through 488.
https://referencesource.org/boiler-inspection-requirements-by-state/arizona/
[ "state", "statute_citation" ]
null
null
Insurance company inspectors commissioned by the department (accepted in lieu of department inspector, except field inspections of anhydrous ammonia vessels); inspectors holding a National Board commission employed by insurance company, owner user organization or the State of Arkansas
Air tanks of 12 gallons or less containing 150 psi or less; boilers and unfired pressure vessels under Interstate Commerce Commission inspection regulations; boilers and unfired pressure vessels for domestic purposes in private dwellings and apartment houses of eight or fewer apartments; unfired pressure vessels with M...
Arkansas Department of Labor & Licensing, Boiler Inspection Division
arkansas
one internal inspection every three years
one annual internal inspection; one annual external inspection
every two years
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Boilers and fired pressure vessels: One annual internal inspection. One annual external inspection. Unfired pressure vessels every two years. Boilers, gas, and electric water heaters located in schools, nursing homes, day-care centers, and hospitals: Once annually. Low-pressure steam-heating boilers: One internal inspe...
Arkansas
Arkansas Code 20-23-101et seq.; and 5-64-1301 through 1303.
https://referencesource.org/boiler-inspection-requirements-by-state/arkansas/
[ "low_pressure_boiler_interval", "pressure_vessel_interval" ]
null
null
Inspectors holding a valid Certificate of Competency issued by the division (accepted in lieu of Pressure Vessel Unit engineer); owner/user organization inspectors whose inservice programs have been approved by the Pressure Vessel Unit
Boilers and pressure vessels under federal inspection and control or exempted by the labor code; boilers on automobiles and road motor vehicles; boilers and unfired pressure vessels used in household service; air pressure tanks under US DOT, Public Utilities Commission, or Highway Patrol jurisdiction; unfired pressure ...
Department of Industrial Relations, Division of Industrial Safety and Health
california
null
one annual internal and external inspection (Exception: boilers in turbo-electric plants furnishing steam to a single turbine inspected internally at least once each 18 months); Title 8, Section 770 allows fired boilers to go up to three years without internal inspection after application and acceptance by the Pressure...
one inspection at least every three years for portable air tanks and five years for all other air tanks; LPG tanks on schedule by usage type (3–5 years)
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
California Code of Regulations, Title 8. Chapter 4. Division of Industrial Safety, Subchapter 1. Unfired Pressure Vessel Safety , Sections 450 through 560; Subchapter 2. Boiler and Fired Pressure Vessel Safety , Sections 750 through 797. RULES FOR CONSTRUCTION AND STAMPING Construction:
California
California Code of Regulations, Title 8. Chapter 4. Division of Industrial Safety, Subchapter 1. Unfired Pressure Vessel Safety , Sections 450 through 560; Subchapter 2. Boiler and Fired Pressure Vessel Safety , Sections 750 through 797.
https://referencesource.org/boiler-inspection-requirements-by-state/california/
[ "state", "statute_citation" ]
null
null
city-employed inspectors
null
The City of Chicago Boiler Bureau
chicago
periodic external inspections and internal inspections at the inspector's discretion
periodic internal and external inspections
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
The City of Chicago Boiler Bureau administers inspections under the Municipal Code of Chicago, Title 4, Chapter 344. Authorized inspector types: Chicago accepts only city-employed inspectors and does not recognize insurance company inspections. Inspection frequency: High-pressure boilers require periodic internal and e...
Chicago
Municipal Code of Chicago, Title 4, Chapter 344
https://referencesource.org/boiler-inspection-requirements-by-state/chicago/
[ "accepted_inspectors", "governing_body", "power_boiler_interval", "state", "statute_citation" ]
null
null
Insurance company inspectors commissioned by the division (accepted in lieu of division inspector, except first certificate inspection of new or reinstalled boiler must be by division inspector); owner/user inspection organizations approved by the director
Boilers owned or operated by the federal government; locomotive boilers of carriers subject to Federal Locomotive Inspection Act; boilers in private residences and apartment houses with fewer than six families; boilers in cities where city boiler inspectors and codes are comparable to state program; service and domesti...
Department of Labor and Employment, Division of Oil and Public Safety - Boiler Section
colorado
certificate inspection biennially; external or internal inspection
certificate inspection annually; internal inspection annually (may be extended to triennially with prior approval from the Boiler Division)
ASME Code vessels bearing ASME Code stamping considered suitable; non-ASME Code pressure vessel must be certified by the Boiler Inspection Section
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boilers and high-temperature water boilers shall receive a certificate inspection annually. Such boilers where construction permits shall also receive an internal inspection annually, or when the inspector deems necessary. The internal inspection frequency may be extended to triennially with prior approval from t...
Colorado
Colorado Revised Statutes, Title 9. Safety — Industrial and Commercial, Article 4. Buildings and Equipment, Boiler Inspection .
https://referencesource.org/boiler-inspection-requirements-by-state/colorado/
[ "power_boiler_interval" ]
null
null
Insurance company inspectors commissioned by the department (accepted in lieu of department inspector)
Boilers under federal control; portable boilers used in pumping, heating, steaming, and drilling in the open field; portable boilers for agricultural purposes; steam-heating boilers, hot-water heaters, and hot-water heating boilers in private homes or apartment houses of not more than five families; hot-water heaters a...
Department of Administrative Services, Bureau of Boilers, Office of the State Building Inspector, Division of Construction Services
connecticut
external biennially, with an internal at the discretion of the inspector
one annual internal and external inspection; one annual external inspection under operating conditions not more than six months after the internal and external inspection (power boilers with internal water treatment under qualified engineer: internal and external inspection every eighteen months, plus external inspecti...
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Public service companies as defined in Connecticut General Statutes (Section 16-1). OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, plus water heaters in public buildings, regardless of size or BTU rating. INSPECTIONS REQUIRED Power boilers: One annual inter...
Connecticut
Connecticut General Statutes, Chapter 540, Sections 29-231 through 29-244 .
https://referencesource.org/boiler-inspection-requirements-by-state/connecticut/
[ "low_pressure_boiler_interval", "power_boiler_interval", "state" ]
null
null
commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies
null
The Delaware Department of Natural Resources and Environmental Control
delaware
biennial external inspections
annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commis...
Delaware
Delaware Code, Title 7, Chapter 74B, Section 7401B
https://referencesource.org/boiler-inspection-requirements-by-state/delaware/
[ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual externa...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Con...
Insurance companies required to do inservice inspections of all insured boilers in areas of public assembly; upon filing report of satisfactory inspection, boiler exempt from inspection by the Boiler Safety Program
Boilers and lined hot-water heaters under the control of the federal government; HLW hot-water supply boilers or lined storage water heaters directly fired with oil, gas, electricity, or solar energy not exceeding 400,000 BTU per hour, 210°F, 120 gallons
Bureau of Fire Prevention, Boiler Safety Section, Division of the State Fire Marshal
florida
certificate inspection biennially; internal inspection if the construction so permits
certificate inspection annually; external inspection while under pressure; internal inspection if the construction so permits
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boilers and high-temperature water boilers: Certificate inspection annually; External inspection while under pressure; Internal inspection if the construction so permits. Low-pressure steam or vapor heating boilers: Certificate inspection biennially; Internal inspection if the construction so permits. Hot-water h...
Florida
Florida Statutes, Title 33. Regulations of Trade, Commerce, Investments and Solicitations, Chapter 554. Boiler Safety , Sections 101.1 through 115.0.
https://referencesource.org/boiler-inspection-requirements-by-state/florida/
[ "low_pressure_boiler_interval", "power_boiler_interval" ]
null
null
Insurance company inspectors commissioned by the department (accepted in lieu of department inspector); owner/user inspection organizations approved by the chief safety engineer
Boilers and pressure vessels under federal control; US DOT pressure vessels for transportation and storage of compressed or liquefied gases; unfired pressure vessels on vehicles under other state or federal agencies; air tanks on railroad rights-of-way; unfired pressure vessels not exceeding 5 cu ft/250 psig or 1-1/2 c...
Office of Insurance and Safety Fire Commissioner
georgia
certificate inspection biennially with an internal inspection quadrennially where construction permits
certificate inspection annually, internal inspection where construction permits, plus external inspection while under operating pressure
triennial certificate inspection (if subject to internal corrosion); all others at intervals set by the board with at least a quadrennial certificate inspection
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
King, Commissioner William "Butch" Lynch Jr., Chief Inspector Office of Insurance and Safety Fire Commissioner 2 Martin Luther King Jr. Drive West Tower, Suite 920 Atlanta , Georgia 30334 Telephone ­— 404.656.2064 Email — blynch@oci.ga.gov Firemarshal@oci.ga.gov Fax — 404.679.5818 EMPOWERMENT Dire...
Georgia
Official Code of Georgia Annotated, Title 25. Labor, Chapter 15 Article 2. Regulations of Boilers and Pressure Vessel Safety Act , Chapter 120-3-26. Georgia Boiler and Pressure Vessel Rules.
https://referencesource.org/boiler-inspection-requirements-by-state/georgia/
[ "governing_body", "state", "statute_citation" ]
null
null
Insurance companies required to inspect all insured objects; inspection reports submitted within thirty days
Boilers and pressure vessels under federal inspection and control; unfired pressure vessels meeting US DOT requirements for transporting liquids or gases under pressure; containers for storage of liquefied compressed flammable gases under other agencies; unfired pressure vessels with nominal water-containing capacity o...
Hawaii Department of Labor and Industrial Relations, Division of Occupational Safety and Health, Boiler and Elevator Inspection Branch
hawaii
biennial external inspection and/or an internal inspection where construction permits (large steam heating boilers require annual internal inspection, and external inspection at approximately six-months after each internal)
annual internal or permit inspection; external inspection at approximately six-months after each internal (biennial internal inspections permitted for power boilers with continuous internal water treatment under qualified supervision upon approval of the director)
biennial external inspection and/or internal inspection where construction permits
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Hawaii Revised Statutes, Chapter 397 Boiler and Elevator Safety Law . Hawaii Administrative Rules: Part 10, Boilers and Pressure Vessels. RULES FOR CONSTRUCTION AND STAMPING Construction:
Hawaii
Hawaii Revised Statutes, Chapter 397 Boiler and Elevator Safety Law . Hawaii Administrative Rules: Part 10, Boilers and Pressure Vessels.
https://referencesource.org/boiler-inspection-requirements-by-state/hawaii/
[ "state", "statute_citation" ]
null
null
Insurance company (contact insurance company for regular inspections)
null
Idaho Division of Occupational and Professional Licenses, Industrial Safety Section
idaho
null
null
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
The Idaho Legislature repealed the Boiler and Pressure Vessel Rules effective March 29, 2010. Contact your insurance company for regular inspections in order to maintain the safety of your workplace.
Idaho
null
https://referencesource.org/boiler-inspection-requirements-by-state/idaho/
[ "state" ]
null
null
division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors
null
The Illinois Office of the State Fire Marshal
illinois
biennial inspections
annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commission...
Illinois
Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act
https://referencesource.org/boiler-inspection-requirements-by-state/illinois/
[ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safe...
State-employed inspectors conduct all first inspections. For ongoing inspections, commissioned insurance inspectors when vessels are insured and commissioned owner inspection agency inspectors
null
Department of Homeland Security's Division of Fire and Building Safety
indiana
biennial certificate inspections conducted externally and internally, where construction permits
annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when...
Indiana
Indiana Administrative Code, Title 680
https://referencesource.org/boiler-inspection-requirements-by-state/indiana/
[ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety o...
Inspections made by inspectors employed by insurance companies and commissioned by the division are accepted in lieu of inspections made by a state inspector.
Section 89.4 identifies the objects that are exempted from section 89.3.
Department of Inspections, Appeals, & Licensing, Boilers & Pressure Vessel Inspection Bureau
iowa
null
null
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
INSPECTIONS REQUIRED <http://www.legis.iowa.gov/docs/ico/chapter/89.pdf> Iowa Code Chapter 89 Section 89.3 identifies the different equipment types, inspection type(s), and the inspection schedule(s) to be performed. Section 89.4 identifies the objects that are exempted from section 89.3. INSURANCE INSPECTION REQUIREME...
Iowa
Iowa Code Chapter 89; Iowa Administrative Code Chapters 481-390 through 481-395
https://referencesource.org/boiler-inspection-requirements-by-state/iowa/
[ "exemptions", "state" ]
null
null
Inspections made by inspectors employed by insurance companies and certified by the chief inspector are accepted in lieu of inspections made by a state inspector.
Boilers and pressure vessels under the control of the US government. Fire engine boilers brought into the state for temporary use in times of emergency. Boilers and pressure vessels located on producing oil and gas leases or storage areas outside the limits of any municipality, used solely for oil and gas production pu...
Office of the State Fire Marshal
kansas
Steam heating boilers: Annual certificate inspection; A triennial internal inspection where construction permits. Hot-water supply boilers: a triennial external certificate inspection (under 400,000 BTU per hour). Low-pressure hot-water supply boilers with heat input over 400,000 BTU: an annual external certificate ins...
Annual certificate inspection (internal inspection); Annual external inspection while under pressure, if possible, at approximately a six-month interval from the certificate inspection.
One-time inspection of new installations and the replacement of vessels 15 cubic feet and over constructed and installed after January 1, 1999.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
STATE DEPARTMENT Robert Stimson, Acting Chief Boiler Inspector Office of the State Fire Marshal 800 S.W. Jackson St., Suite 104 Topeka , Kansas 66612 Telephone &mdash; 785.296.3401 Email &mdash; boiler.inspection@ks.gov rob.stimson@ks.gov Fax &mdash; 785.296.0151 EMPOWERMENT Legislative committees empowered to make, al...
Kansas
Kansas Statutes Annotated, Chapter 44. Labor and Industries, Kansas Boiler Safety Act, K.S.A 44-913 et. seq.
https://referencesource.org/boiler-inspection-requirements-by-state/kansas/
[ "governing_body", "state", "statute_citation" ]
null
null
Department inspectors conduct all new installation inspections. For ongoing inspections, commissioned insurance company inspectors
null
Department of Housing, Buildings and Construction, Division of Plumbing
kentucky
biennial internal and external inspections, where construction permits, with a two-month grace period allowed
annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoi...
Kentucky
Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990
https://referencesource.org/boiler-inspection-requirements-by-state/kentucky/
[ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "exemptions", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance ...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boi...
Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by deputy boiler inspectors.
Boilers under federal control. Boilers on steam fire engines brought into the state for temporary use in times of emergency. Portable boilers used for agricultural purposes only. Boilers built for a pressure of 15 psig or less, for noncommercial use. All potable water boilers and hot-water heaters, except the provision...
Louisiana State Fire Marshal Office, Mechanical Safety Section
louisiana
A certificate inspection will be conducted biennially: Steam or vapor boilers: An external inspection and internal inspection biennially where construction permits; Hot-water heating and hot-water supply boilers: An external certificate inspection biennially, and – where construction permits — an internal inspection ev...
An annual external certificate inspection followed by an internal certificate inspection approximately six months after each external inspection. The interval between internal inspections may be extended for a period not to exceed 24 months on a stationary boiler provided certain conditions are met. Internal inspection...
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Louisiana Revised Statutes, Title 23, Chapter 5, Part III, Regulations Affecting Boilers .
Louisiana
Louisiana Revised Statutes, Title 23, Chapter 5, Part III, Regulations Affecting Boilers
https://referencesource.org/boiler-inspection-requirements-by-state/louisiana/
[ "state", "statute_citation" ]
null
null
Inspections made by inspectors employed by insurance companies and licensed by the Boiler and Pressure Vessel Safety Program are accepted in lieu of inspections made by a department inspector.
Boilers and pressure vessels under federal control. Boilers and pressure vessels used for agricultural purposes only. Boilers used solely for propelling motor road vehicles. Boilers of steam fire engines brought into the state for temporary use in times of emergency to check conflagrations. Low pressure steam heating b...
Boiler and Pressure Vessel Safety Program, Office of Professional and Occupational Regulation
maine
Low pressure steam heating boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection every third year, with an external or internal inspection at the discretion of the inspector on the two intervening years. Low pressure hot-water supply boilers located in schoolhouses: o...
One annual internal certificate inspection; One annual external inspection, in operation, approximately six months from the certificate inspection.
Initial inspection shall be an external safety inspection; Renewal certificate inspections are completed once every 3 years and it shall be an internal where construction permits.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
High-pressure boilers: One annual internal certificate inspection; One annual external inspection, in operation, approximately six months from the certificate inspection. Miniature boilers: One annual certificate inspection; One biennial internal inspection. Cast-iron boilers: one annual certificate inspection while un...
Maine
Maine Revised Statutes, Title 32. Professions and Occupations, Chapter 131. Boilers and Pressure Vessels, Sections 15101 through 15121.
https://referencesource.org/boiler-inspection-requirements-by-state/maine/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ]
null
null
commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request
null
Department of Labor, Licensing and Regulation's Safety Inspections Unit
maryland
biennial certificate inspections
annual internal inspections, where construction permits and annual external inspections performed while under pressure
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual...
Maryland
Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9
https://referencesource.org/boiler-inspection-requirements-by-state/maryland/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as ...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorize...
Inspections, except first inspections, made by inspectors employed by Authorized Inspection Agencies and commissioned by the department are accepted in lieu of inspections made by a department inspector.
All boilers, refrigeration and air conditioning systems, except when under the jurisdiction of the federal government. Heating boilers having less than 4 square feet grate surface; having a steam capacity less than 104 pounds per hour; used as a hot-water heating boiler with an output capacity less than 200,000 BTU per...
Department of Fire Services, Chief of Engineering Inspections
massachusetts
Hot-water heating and hot-water supply boilers: One inspection annually; One internal inspection every three years where construction permits.
One annual internal inspection; One annual external inspection with boiler in service at approximately a six-month interval from the internal inspection.
Air tanks: one internal inspection every two years.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
The General Laws of Massachusetts, Part I. Administration of the Government, Title 20. Public Safety and Good Order, Chapter 146. Inspection of Boilers, Air Tanks, etc. RULES FOR CONSTRUCTION AND STAMPING Construction:
Massachusetts
The General Laws of Massachusetts, Part I. Administration of the Government, Title 20. Public Safety and Good Order, Chapter 146. Inspection of Boilers, Air Tanks, etc.
https://referencesource.org/boiler-inspection-requirements-by-state/massachusetts/
[ "state", "statute_citation" ]
null
null
Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies
null
Department of Licensing and Regulatory Affairs' Boiler Division
michigan
biennial certificate inspections, with a two-month grace period allowed
annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. ...
Michigan
Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947
https://referencesource.org/boiler-inspection-requirements-by-state/michigan/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "exemptions", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", ...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades ...
Inspections made by inspectors employed by insurance companies and holding a valid Certificate of Competency issued by the department are accepted in lieu of inspections made by a department inspector.
Boilers and pressure vessels under federal control. Boilers and pressure vessels in buildings occupied solely for residential purposes with accommodations for not more than five families. Railroad locomotives. Air tanks installed on the right-of-way of railroads. Unfired pressure vessels having an internal or external ...
Minnesota Department of Labor and Industry, Construction Codes and Licensing Division, Boiler Division
minnesota
Boilers and steam generators: one annual inspection.
Boilers and steam generators: one annual inspection.
Unfired pressure vessels: biennial inspection.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Boilers and steam generators: one annual inspection. Unfired pressure vessels: biennial inspection. Stationary show boilers used for display and demonstration: Biennial inspection. Note: Refer to last two paragraphs under Insurance Inspection Requirements. INSURANCE INSPECTION REQUIREMENTS Inspections made by inspector...
Minnesota
Minnesota Statutes – 2023, Chapters 326B.93 to 326B.998, Boilers. Minnesota Rules – Chapter 5225.
https://referencesource.org/boiler-inspection-requirements-by-state/minnesota/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval", "state" ]
null
null
Inspections made by insurance company inspectors commissioned by the board are accepted in lieu of inspections made by a department inspector.
Boilers and pressure vessels located on US government property and/or under federal government control. Pressure vessels used for transportation and storage of compressed gases when constructed in compliance with specifications of the US Department of Transportation. Air tanks located on vehicles operating under the ru...
Mississippi State Department of Health, Boiler and Pressure Vessel Safety Branch
mississippi
Heating boilers shall receive a certificate inspection biennially.
Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible.
Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Pressure vessels covered under the Liquefied Compressed Gas Equipment Inspection Law of Mississippi (Sections 75-57-1 through 75-57-63), Mississippi Code of 1972 . Air-receiving tanks and attached tanks used in connection with automobile filling stations that do not exceed 15 cubic feet in volume and 250 psig pressure ...
Mississippi
Mississippi Code, Title 45. Public Safety and Good Order, Chapter 23. Boiler and Pressure Vessel Safety.
https://referencesource.org/boiler-inspection-requirements-by-state/mississippi/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval", "state" ]
null
null
Inspectors employed by insurance companies and approved owner/user inspection agencies are accepted in lieu of inspections made by the department.
Water heaters, pool heaters, and hot-water supply boilers in which none of the following limitations is exceeded: A heat input of 200,000 BTU per hour; A water temperature of 210°F; A nominal water-containing capacity of 120 gallons. Hot-water storage tanks less than or equal to 120 gallons. Pressure vessels that have ...
Division of Fire Safety, Boiler and Pressure Vessel Safety Unit
missouri
Low-pressure boilers and pressure vessels: A biennial certificate inspection: Steam or vapor boilers shall have an external inspection and an internal inspection biennially where construction permits; Hot-water heating and hot-water supply boilers shall have an external inspection biennially and where construction perm...
An annual certificate inspection which shall be an internal inspection where construction permits; An annual external inspection while under normal operating conditions.
Pressure vessels shall have an external inspection biennially.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boilers; high-pressure, high-temperature water boilers; waste heat boilers; and unfired steam boilers and thermal fluid heaters: An annual certificate inspection which shall be an internal inspection where construction permits; An annual external inspection while under normal operating conditions. Low-pressure bo...
Missouri
Missouri Revised Statutes, Chapter 650. Department of Public Safety, Boiler and Pressure Vessel Act, Sections 200 through 290. Rules of Department of Public Safety, Division 40, Chapter 2, Boiler and Pressure Vessel Safety Rules.
https://referencesource.org/boiler-inspection-requirements-by-state/missouri/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ]
null
null
Inspections made by inspectors employed by insurance companies may be accepted in lieu of inspections made by bureau inspectors as equivalent to those of the state inspectors. Each such special inspector shall hold a certificate as boiler inspector issued by the National Board of Boiler and Pressure Vessel Inspectors.
Boilers under federal control. Steam-heating boilers operated at not over 15 psig in private residences or apartments of six or fewer families. Hot-water heating or supply boilers operated at not over 50 psig and temperatures not over 250°F when in private residences, or apartments of six or fewer families.
Department of Labor and Industry, Building Codes Bureau, Boiler, Elevator, Weights and Measures
montana
All automatically fired boilers rated with an input of less than 400,000 BTU per hour: biennial inspection.
Steam heating and power boilers: annual internal inspection. All manually-fired boilers and all boilers and banks of boilers rated with a total input of 400,000 BTU per hour or greater: annual inspection.
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
All manually-fired boilers and all boilers and banks of boilers rated with a total input of 400,000 BTU per hour or greater: annual inspection. All automatically fired boilers rated with an input of less than 400,000 BTU per hour: biennial inspection. Steam heating and power boilers: annual internal inspection. This in...
Montana
Montana Code 2001, Title 50. Health and Safety, Chapter 60. Building Construction Standards and Chapter 74. Boiler and Steam Engines.
https://referencesource.org/boiler-inspection-requirements-by-state/montana/
[ "low_pressure_boiler_interval", "power_boiler_interval" ]
null
null
Inspections made by Special Inspectors employed by National Board Accredited Authorized Inspection Agencies are accepted in lieu of inspections made by an agency inspector.
Boilers under federal jurisdiction and control. Boilers of railway locomotives subject to federal inspection. Boilers operated and regularly inspected by railway companies operating in interstate commerce. Boilers used exclusively for agricultural purposes. Steam-heating boilers in single family residences and apartmen...
Nebraska State Fire Marshal Agency, Boiler Inspection Division
nebraska
Steam or vapor boilers shall receive an external inspection annually to renew the certificate and an internal inspection biennially where construction permits. Pool heaters, spa heaters, hot water heating boilers and hot water supply boilers shall receive an external inspection annually to renew the certificate, and, w...
Power boilers and high-pressure, high-temperature water boilers shall receive an internal inspection annually where construction permits and an external inspection while in operation, if possible; otherwise, it shall be as complete an inspection as possible. All jurisdictional boilers shall receive an annual external c...
Pressure vessels subject to internal corrosion shall be inspected internally and externally biennially. Pressure vessels not subject to corrosion shall receive an external inspection biennially. Pressure vessels not subject to internal corrosion shall be inspected internally, where construction permits, quinquennially ...
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Nebraska Administrative Code and the National Board Inspection Code , or API-510, as applicable. INSURANCE INSPECTION REQUIREMENTS Inspections made by Special Inspectors employed by National Board Accredited Authorized Inspection Agencies are accepted in lieu of inspections made by an agency inspector.
Nebraska
Nebraska Revised Statutes, Boiler Inspection Act. Title 81, Sections 81-5,165 to 81-5,189. Nebraska Administrative Code, Title 229. Chapters 1 through 28.
https://referencesource.org/boiler-inspection-requirements-by-state/nebraska/
[ "accepted_inspectors", "state" ]
null
null
An inspection made by a special inspector (employed by an inspection entity), holding a Certificate of Competency received from the division, is accepted in lieu of an inspection made by a Jurisdictional inspector.
Objects meeting exemption rules per NAC 455C.114
Department of Business & Industry, Division of Industrial Relations, Mechanical Compliance Section
nevada
Low-pressure steam heating boilers: one annual external inspection. Where design and construction permit, an internal inspection shall be conducted biennially. Hot-water heating boilers and hot-water supply boilers: one internal inspection biennially if design and construction permit and inspector/special inspector req...
One annual internal inspection; One annual external inspection at approximately a six-month interval from the internal inspection.
Mechanical Compliance Section jurisdiction: One external inspection quadrennially; internal if design and construction permit. Mine Section jurisdiction: One external inspection triennially; internal if design and construction permit.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Nevada Administrative Code, Title 455C. Boilers, Elevators, and Pressure Vessels Mine Section:
Nevada
Nevada Administrative Code, Title 455C. Boilers, Elevators, and Pressure Vessels
https://referencesource.org/boiler-inspection-requirements-by-state/nevada/
[ "state", "statute_citation" ]
null
null
Inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.
Properties used exclusively as private residences or apartment houses of fewer than three family units. Properties used exclusively as private residences or apartment houses with three or more family units with an output of less than 200,000 BTU per hour.
New Hampshire Department of Labor
new-hampshire
one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits
One annual certificate inspection; One annual external inspection while under pressure, if possible.
one biennial certificate inspection
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boilers and high-pressure, high-temperature water boilers: One annual certificate inspection; One annual external inspection while under pressure, if possible. Low-pressure steam or vapor heating boilers, hot-water heating and hot-water supply boilers: one biennial certificate inspection, with an internal inspect...
New Hampshire
New Hampshire Revised Statutes, Annotated and Administrative Rules, New Hampshire Department of Labor, Title 12. Public Safety and Welfare, Chapter 157-A. Boilers and Pressure Vessels, Sections A1 through A14.
https://referencesource.org/boiler-inspection-requirements-by-state/new-hampshire/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ]
null
null
commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs
null
Department of Labor and Workforce Development's Mechanical Inspection Bureau
new-jersey
annual external inspections and biennial internal inspections
annual internal and external inspections
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure b...
New Jersey
New Jersey State Statutes, Title 34, and Administrative Code 12:90
https://referencesource.org/boiler-inspection-requirements-by-state/new-jersey/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal insp...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized ins...
Any inspection agency, authorized by the National Board, licensed to sell boiler or pressure vessel insurance in New Mexico, and insuring a boiler located in the state is required to inspect. Insurance company inspectors must hold a National Board Commission and be commissioned by the state.
Public utilities, rural electric cooperatives, mine processing, refinery processing, gas processing, and lumber industries (sawmill only). Listed and approved potable water heaters when heat input does not exceed 200,000 BTU per hour, water temperature does not exceed 250°F and 160 psi pressure, and nominal water-conta...
Regulation and Licensing Department, Construction Industries Division
new-mexico
A biennial external inspection; An internal inspection if need indicates. (Applies to low-pressure steam boilers and low-pressure, hot-water heating boilers, and hot-water supply boilers.)
An annual external inspection; An annual internal inspection, where construction permits.
null
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Any inspection agency, authorized by the National Board, licensed to sell boiler or pressure vessel insurance in New Mexico, and insuring a boiler located in the state is required to inspect. Insurance company inspectors must hold a National Board Commission and be commissioned by the state. CERTIFICATE OF INSPECTION A...
New Mexico
New Mexico Administrative Code, Title 14. Housing and Construction, Chapter 9. Mechanical Codes, Part 4. Boilers.
https://referencesource.org/boiler-inspection-requirements-by-state/new-mexico/
[ "accepted_inspectors", "state" ]
null
null
commissioned insurance company inspectors and National Board-commissioned shop inspectors
null
New York Department of Labor's Boiler Safety Bureau
new-york
triennial internal inspections and biennial external inspections (steam); internal inspections every five years and biennial external inspections (hot-water)
annual internal and external inspections, with external inspections conducted approximately six months after internal inspections
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
The New York Department of Labor&#8217;s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-p...
New York
New York State Laws, Labor, Chapter 31, Article 7, Section 204
https://referencesource.org/boiler-inspection-requirements-by-state/new-york/
[ "accepted_inspectors", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "exemptions", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "value": "Boilers loc...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor&#8217;s Boiler Safety Bureau administers inspecti...
Department inspectors conduct all first inspections. For subsequent inspections, commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections
null
New York City Department of Buildings
new-york-city
annual external inspections and triennial internal inspections (steam); annual external inspections and internal inspections every five years (hot-water)
annual internal and external inspections (steam); annual external inspections and triennial internal inspections (hot-water)
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 als...
New York City
New York State Industrial Code Rules 4 and 14
https://referencesource.org/boiler-inspection-requirements-by-state/new-york-city/
[ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "exemptions", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boiler...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections ...
Inspections made by "Special" inspectors employed by insurance companies and commissioned by the Commissioner are accepted in lieu of inspections made by a State deputy inspector.
Boilers and pressure vessels owned and/or operated by the federal government. Boilers and pressure vessels which are located in private residences or in apartment houses of fewer than six families. Pressure vessels operating at a working pressure not exceeding 15 psig.
Department of Labor, Boiler Safety Bureau
north-carolina
Low-pressure boilers and pressure vessels: External 2 Years.
High-pressure boilers: Internal 1 Year, External 1 Year.
Low-pressure boilers and pressure vessels: External 2 Years. Hydropneumatic storage tanks: External 4 Years.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
North Carolina General Statutes, Chapter 95, Article 7A, and North Carolina Administrative Code, Title 13, Chapter 13. RULES FOR CODES AND STAMPING Codes:
North Carolina
North Carolina General Statutes, Chapter 95, Article 7A, and North Carolina Administrative Code, Title 13, Chapter 13.
https://referencesource.org/boiler-inspection-requirements-by-state/north-carolina/
[ "state", "statute_citation" ]
null
null
Inspections made by inspectors employed by National Board approved Authorized Inspection Agencies and commissioned by the department are accepted. Inspections made by inspectors employed by owners/users and commissioned by the department are accepted.
Boilers and pressure vessels subject to federal inspection or under federal control. Boilers and pressure vessels located on farms and used solely for agricultural purposes. Heating boilers which are located in private residences or in apartment houses of fewer than six family units. Miniature hobby boilers not exceedi...
North Dakota Department of Environmental Quality, Boiler Inspection Program
north-dakota
Low-pressure steam boilers, steel: Internal 2 Years, External 2 Years. Low-pressure steam boilers, cast-iron: External 1 Year. Hot-water heating and hot-water supply boilers: External 3 Years (one annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens).
High-pressure boilers: Internal 1 Year, External 1 Year (while under pressure).
Field inspection of pressure vessels (other than anhydrous ammonia pressure vessels) is not required.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Item | Internal | External | High-pressure boilers | 1 Year | 1 Year* | Low-pressure steam boilers, steel | 2 Years | 2 Years | Low-pressure steam boilers, cast-iron | &mdash; | 1 Year | Hot-water heating and hot-water supply boilers | &mdash; | 3 Years** | *External inspection while under pressure. **One annual extern...
North Dakota
North Dakota Statutes, Title 23.1. Environmental Quality, Chapter 23.1-16. Boiler Inspection, Sections 1 through 14.
https://referencesource.org/boiler-inspection-requirements-by-state/north-dakota/
[ "low_pressure_boiler_interval", "power_boiler_interval" ]
null
null
commissioned inspectors from authorized insurance companies
null
Ohio Department of Commerce's Division of Industrial Compliance
ohio
triennial internal inspections and annual external inspections under operating conditions
annual internal and external inspections while operating
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
Ohio Ohio&#8217;s inspection framework: Governing body: The Ohio Department of Commerce&#8217;s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection ...
Ohio
Ohio Revised Code, Title 41, Chapter 4104
https://referencesource.org/boiler-inspection-requirements-by-state/ohio/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR ...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio&#8217;s inspection framework: Governing body: The Ohio Department of Com...
Inspections made by insurance company inspectors may be accepted in lieu of inspections made by a department inspector, provided a photostatic copy of the inspector's National Board Certificate is furnished to the department and the inspector is authorized by the commissioner of labor.
Pressure vessels not exceeding 15 cubic feet in volume and 250 psig. Low-pressure steam boilers, hot-water heating boilers, hot-water supply boilers, hot-water supply heaters, or pressure vessels located in private residences or in apartment houses of fewer than six family units. Pressure vessels on remote sites limite...
Department of Labor, Safety Standards Division
oklahoma
Low-pressure steam and vapor heating boilers: Internal 2 Years, External 1 Year. Hot-water heating and hot-water supply boilers: Internal at the discretion of the inspector, External 1 Year.
Power boilers and high-temperature, high-pressure boilers: Internal 1 Year, External 1 Year (under pressure).
Pressure vessels subject to internal corrosion: Internal 3 Years, External 3 Years. Pressure vessels not subject to internal corrosion: Internal 10 Years, External 3 Years.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Item | Internal | External | Power boilers and high-temperature, high-pressure boilers | 1 Year | 1 Year* | Low-pressure steam and vapor heating boilers | 2 Years | 1 Year | Hot-water heating and hot-water supply boilers | ** | 1 Year | Hot-water supply heaters | *** | 2 Years | Pressure vessels, excluding those within...
Oklahoma
Oklahoma State Statutes, Title 40. Labor, Oklahoma Boiler and Pressure Vessel Law, Sections 141.0 through 141.20 and Administrative Rules 380:25.
https://referencesource.org/boiler-inspection-requirements-by-state/oklahoma/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ]
null
null
Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a deputy boiler inspector.
Boilers and pressure vessels under federal control. Domestic water heaters not exceeding 120 gallons, 210°F, 150 psig, and 200,000 BTU per hour. Boilers operated at less than 15 psig located on farms and used solely for agricultural purposes. Boilers or pressure vessels used in a single private residence (exempt from s...
Department of Consumer and Business Services, Building Codes Division, Boiler and Pressure Vessel Group
oregon
Low-pressure steam and vapor-heating boilers: Internal 2 Years, External 2 Years. Cast-iron boilers: External 2 Years. Low-pressure hot-water heating and hot-water supply boilers: Internal 6 Years, External 2 Years.
Power Boilers: Internal 1 Year, External 1 Year.
Pressure vessels subject to internal corrosion: Internal 2 Years, External 2 Years. Pressure vessels not subject to internal corrosion: External 2 Years. Pressure vessels containing anhydrous ammonia intended for use as a fertilizer: External 3 Years.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
INSURANCE INSPECTION REQUIREMENTS Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a...
Oregon
Oregon Revised Statutes, Volume 11, Title 38. Protection from Fire, Chapter 480. Explosives, Flammable Materials, Pressure Vessels, Sections 510 through 990.
https://referencesource.org/boiler-inspection-requirements-by-state/oregon/
[ "accepted_inspectors", "state" ]
null
null
commissioned inspectors from authorized insurance companies and registered owner inspection agencies
null
Department of Labor and Industry's Boiler Division
pennsylvania
biennial internal or external inspections
annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met
null
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
The Department of Labor and Industry&#8217;s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspectio...
Pennsylvania
Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17
https://referencesource.org/boiler-inspection-requirements-by-state/pennsylvania/
[ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ]
[ { "as_of": "2026-08-05T00:00:00", "field": "pressure_vessel_interval", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vess...
[ { "field": "governing_body", "versions": [ { "as_of": "2026-08-05T00:00:00", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry&#8217;s Boiler Division administers inspectio...
Inspections are made by private inspectors and inspectors employed by insurance companies authorized by the Secretary of Labor and Human Resources. (Department of Labor and Human Resources does not make inspections).
All boilers and pressure vessels, except definitions and exemptions as established by ASME Code.
Commonwealth of Puerto Rico, Department of Labor and Human Resources, P.R. Occupational Safety and Health Administration (PR OSHA), Boiler and Elevator Division
puerto-rico
One annual internal; One annual external and operational.
One annual internal; One annual external and operational.
One annual internal; One annual external and operational.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Boilers and Pressure Vessels: One annual internal; One annual external and operational.
Puerto Rico
Regulation Number 17 of the Office of the Assistant Secretary for Occupational Safety & Health, Regulation of Boilers and Pressure Vessels
https://referencesource.org/boiler-inspection-requirements-by-state/puerto-rico/
[ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ]
null
null
End of preview. Expand in Data Studio

US boiler and pressure vessel inspection requirements by state

Canonical, always-current version: https://referencesource.org/boiler-inspection-requirements-by-state/ Machine-readable: https://referencesource.org/boiler-inspection-requirements-by-state/data.json — this mirror is a point-in-time copy.

  • Last verified: 2026-08-05
  • Stale after: 2027-08-05 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
  • Records: 55

State-by-state comparison of boiler and pressure vessel inspection requirements across all US states. Each record is one state with its inspection intervals by boiler type (power, low-pressure steam, hot water, unfired pressure vessel), accepted inspector qualifications (state, insurance, owner-user), residential and size/pressure exemptions, governing statute citation, and administering agency. Answers 'how often does Ohio require boiler inspections', 'which states accept insurance company inspections in lieu of state inspections', and 'are residential boilers exempt in my state'.

Provenance — what every record carries

Every record carries source (the URL the value was read from) and source_quote (a verbatim quote from that page stating it). A value you cannot check against its page is indistinguishable from an invented one; these can all be checked. Each record is also individually addressable on the canonical site at its url.

Licence position

Facts extracted from state statutes (government works) and industry reference (National Board Synopsis, freely published). Inspection intervals and exemptions are regulatory facts, not copyrightable.

Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.

Sources

Fields

See any record in data/records.jsonl — field names are self-describing, and the canonical page for each record renders them with labels: https://referencesource.org/boiler-inspection-requirements-by-state/

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