Code of Massachusetts Regulations › 310 CMR - DEPARTMENT OF ENVIRONMENTAL PROTECTION › Title 310 CMR 15.000 - The State Environmental Code, Title 5: Standard Requirements for the Siting, Construction, Inspection, Upgrade and Expansion of On-site Sewage Treatment and Disposal Systems and for the Transport and Disposal of Septage › Subpart C - DESIGN, CONSTRUCTION, REPAIR, AND REPLACEMENT OF ON-SITE SEWAGE DISPOSAL SYSTEMS › Section 15.203 - System Sewage Flow Design Criteria

Current through Register 1525, July 5, 2024
(1) Each
				component of an on-site subsurface sewage disposal system shall be designed to
				treat sanitary sewage discharged from all buildings to be served by the system
				using the System Sewage Flow Design flows set forth at
				310
				CMR 15.203(2) through (5),
				except as provided in
				310
				CMR 15.203(6). Actual water
				meter data shall not be substituted for the design flow criteria for the
				activities listed in
				310
				CMR 15.203(2) through (5)
				unless pursuant to
				310
				CMR 15.416. Design flow is equivalent to
				estimated generated flow for the proposed use plus a factor representing flow
				variations.
TYPE OF ESTABLISHMENT
UNIT
GALLONS PER DAY
MINIMUM ALLOWABLE GPD FOR SYSTEM DESIGN
(2) RESIDENTIAL
Bed & Breakfast
per bedroom
110
440
Bed & Breakfast
per bedroom
110
with restaurant open to public add
per seat
35
1000
Camp, resident, mess hall, washroom and
								toilets
per person*
35
Camp, day, washroom and toilets
per person
10
Camp, day, mess hall,
per person
13
washroom and toilets Campground, showers and
								toilets
per site
90
Family Dwelling, Single including, but not limited
								to, single family condominiums & cooperatives
per bedroom
110
330**
Family Dwelling, Multiple
per bedroom
110
***
Family Mobile Home Park
per mobile home
300
Motel, Hotel, Boarding House
per bedroom
110
Retirement Mobile Home Park
per site
150
Housing for the Elderly
per two bedroom unit
150****
Work or Construction Camp
per person
50
(6)
				Facilities other than those listed in 310 CMR 15.203(2) through (5), and
				nonresidential facilities with unique design features that result in
				significantly different design flows than those listed above may apply to the
				Department for a determination of design flow using actual meter readings of
				established flows from existing or similar installations without the need for a
				variance pursuant to
				310 CMR
				15.410 or
				15.416.
				Prior to making a determination the Department will consult with the local
				Approving Authority. For state and federal facilities, the Department may also
				establish system design flows other than those listed above using actual meter
				readings of established flows from existing or similar installations. Any
				design flow established by the Department pursuant to 310 CMR 15.203(6), shall
				be based on 200% of average water meter readings in order to assimilate maximum
				daily flows or on other methods determined to be appropriate by the
				Department.
(7) In schools, flows
				generated from sinks or other drains receiving wastes from science
				laboratories, graphics arts classrooms, or vocational school activities,
				including, but not limited to, automotive repair painting, or metal fabrication
				are classified industrial wastes and shall be directed pursuant to an
				appropriate permit, to a sewer, if a sewer connection is feasible and, if not,
				then to an industrial waste holding tank in accordance with 314 CMR 18.000:
Industrial Wastewater Holding Tank and Container Construction,
				Operation, and Record Keeping Requirements
or an approved hazardous
				waste collection receptacle.