reglab/statecodes huggingface dataset:
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 23 - INITIAL DISTRIBUTION SYSTEM EVALUATION (IDSE) › Section 179-23-005 - SYSTEM SPECIFIC STUDIES

Current through June 17, 2024
005.01 System
				Specific Study Plan
005.02 IDSE
				Report
The IDSE report must include the following elements. A system
				  must submit its IDSE report according to the time frame in 179 NAC
				  23-003.01.
1. The IDSE report must
				include all TTHM and HAA5 analytical results from 179 NAC 16 or 24 compliance
				monitoring and all system specific study monitoring conducted during the period
				of the system specific study presented in a tabular or spreadsheet format
				acceptable to the Department. If changed from the system specific study plan
				submitted under 179 NAC 23-005.01, the IDSE report must also include a
				schematic of the distribution system, the population served, and system type:
				surface water/GWUDI or ground water.
2. If a system used the modeling provision
				under 179 NAC 23-005.01B, the system must include final information for the
				elements described in 179 NAC
				23-005.01B item
				2, and a 24-hour time series graph of residence time for each 179 NAC 24
				compliance monitoring location selected.
3. A system must recommend and justify 179
				NAC 24 compliance monitoring locations and timing based on the protocol in 179
				NAC
				23-008.
4. The IDSE report must include an
				explanation of any deviations from the system's approved system specific study
				plan.
5. The IDSE report must
				include the basis (analytical and modeling results) and justification used to
				select the recommended 179 NAC 24 monitoring locations.
6. A system may submit its IDSE report in
				lieu of a system specific study plan on the schedule identified in 179 NAC
				23-003.01 for submission of the system specific study plan if the system
				believes that it has the necessary information by the time that the system
				specific study plan is due. If a system elects this approach, its IDSE report
				must also include all information required under 179 NAC
				23-005.01
7. A system must retain a complete copy of
				its IDSE report submitted under 179 NAC 23-005 or 40 CFR 141 Subpart U for 10
				years after the date the system submitted it. If the Department modifies the
				179 NAC 24 monitoring requirements that the system recommended in its IDSE
				report or if the Department approves alternative monitoring locations, the
				system must keep a copy of the Department's notification on file for 10 years
				after the date of the Department's notification. A system must make the IDSE
				report and any Department notification available for review by the Department
				or the public.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 23 - INITIAL DISTRIBUTION SYSTEM EVALUATION (IDSE) › Section 179-23-006 - 40/30 CERTIFICATION

Current through June 17, 2024
Systems that submitted 40/30 certification to the Department
				  under 40 CFR 141 Subpart U must retain a complete copy of their certification
				  for 10 years after the date that they submitted their certification. Systems
				  must make the certification, all data upon which the certification is based,
				  and any Department notification available for review by the Department or the
				  public.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 23 - INITIAL DISTRIBUTION SYSTEM EVALUATION (IDSE) › Section 179-23-007 - VERY SMALL SYSTEM WAIVERS

Current through June 17, 2024
Systems serving <500 people that received a small system
				  waiver under 40 CFR 141 Subpart U prior to the effective date of these
				  regulations do not have to comply with 179 NAC 23.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-001 - SCOPE AND AUTHORITY

Current through June 17, 2024
These regulations establish monitoring and other requirements
				  for achieving compliance with maximum contaminant levels (MCLs) based on
				  locational running annual averages (LRAAs) for total trihalomethanes (TTHMs)
				  and haloacetic acids (five) (HAA5), and for achieving compliance with maximum
				  residual disinfectant levels for chlorine and chloramines for certain
				  consecutive systems. This chapter applies to community and non-transient
				  non-community public water systems that use a primary or residual disinfectant
				  other than ultraviolet light or deliver water that has been treated with a
				  primary or residual disinfectant other than ultraviolet light. The authority is
				  found in
Neb. Rev. Stat
. §§
									71-5301
				  to
				  71-5313.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-003 - GENERAL REQUIREMENTS

Current through June 17, 2024
003.01 Schedule
Systems must comply with the requirements in this chapter on
				  the schedule in the following table based on system type.
System type
Compliance date1
Systems that are not part of a combined distribution
				  system and systems that serve the largest population in the combined
				  distribution system
(1) System serving >= 100,000
Systems subject to 40 CFR 141 Subpart V prior to the
						  effective date of these regulations are subject to 179 NAC 24 as of the
						  effective date of these regulations.
(2) System serving 50, 000-99,999
Systems subject to 40 CFR 141 Subpart V prior to the
						  effective date of these reguations are subject to 179 NAC 24 as of the
						  effective date of these regulations.
(3) System serving 10, 000-49,999
October 1, 2013
(4) System serving < 10,000
October 1, 2013 if no
Cryptosporidium
monitoring is required under 179 NAC
						  25-004.01D or
						  October 1, 2014 if
Cryptosporidium
monitoring is required
						  under 179 NAC
						  25-004.01D or
						  25-004.01F
Other systems that are part of a combined distribution
				  system
(5) Consecutive system or wholesale system
At the same time as the system with the earliest
						  compliance date in the combined distribution system
1 The Department may grant up to
				  an additional 24 months for compliance with MCLs and operational evaluation
				  levels if the system requires capital improvements to comply with an
				  MCL.
24-003.01A Systems' monitoring
				frequency is specified in 179 NAC
				24-004.01B.
24-003.01A1 If a system is required to
				conduct quarterly monitoring, it must begin monitoring in the first full
				calendar quarter that includes the compliance date in the table in 179 NAC
				24-003.01.
24-003.01A2 If a system
				is required to conduct monitoring at a frequency that is less than quarterly,
				it must begin monitoring in the calendar month recommended in the initial
				distribution system evaluation (IDSE) report or the calendar month identified
				in the monitoring plan developed under 179 NAC
				24-005 no later than 12 months after
				the compliance date in the table in 179 NAC 24-003.01.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-004 - ROUTINE MONITORING

Current through June 17, 2024
004.01 Monitoring
24-004.01A If a system submitted an IDSE
				report under 40 CFR 141 Subpart U or submits an IDSE report under 179 NAC 23,
				it must begin monitoring at the locations and months the system recommended in
				its IDSE following the schedule in 179 NAC 24-003.01, unless the Department
				requires other locations or additional locations after its review. If a system
				submitted a 40/30 certification under 40 CFR 141 Subpart U or it qualified for
				a very small system waiver under 40 CFR 141 Subpart U or it is a non-transient
				non-community water system serving <10,000 individuals, it must monitor at
				the location(s) and dates identified in its monitoring plan in 179 NAC
				16-005.06, updated as required by 179 NAC
				24-005.
24-004.01B A system must monitor at no fewer
				than the number of locations identified in the following table.
Source water type
Population size category
Monitoring
Frequency1
Distribution
system
monitoring
location
						total
						per
monitoring
period2
Surface water and GWUDI
<500
per year
2 individual
500-3,300
per quarter
2 individual
3, 301-9,999
per quarter
2 dual
10, 000-49,999
per quarter
4 dual
50, 000-249,999
per quarter
8 dual
250, 000-999,999
per quarter
12 dual
1,000, 000-4,999,999
per quarter
16 dual
>=5,000,000
per quarter
20 dual
Ground Water:
<500
per year
2 individual
500-9,999
per year
2 dual
10, 000-99,999
per quarter
4 dual
100, 000-499,999
per quarter
6 dual
>=500,000
per quarter
8 dual
1 All systems must monitor during
				  month of highest DBP concentrations.
2 Systems on quarterly monitoring
				  must take dual sample sets every 90 days at each monitoring location, except
				  for surface water and GWUDI systems serving 500-3,300. Ground water systems
				  serving 500-9,999 on annual monitoring must take dual sample sets at each
				  monitoring location. All other systems on annual monitoring and surface water
				  and GWUDI systems serving 500-3,300 are required to take individual TTHM and
				  HAA5 samples (instead of a dual sample set) at the locations with the highest
				  TTHM and HAA5 concentrations, respectively. For systems serving fewer than 500
				  people, only one location with a dual sample set per monitoring period is
				  needed if highest TTHM and HAA5 concentrations occur at the same location and
				  month.
24-004.01C If a
				system is an undisinfected system that begins using a disinfectant other than
				UV light, the system must consult with the Department to identify compliance
				monitoring locations for 179 NAC 24. The system must then develop a monitoring
				plan under 179 NAC
				24-005 that includes those monitoring
				locations.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-005 - MONITORING PLAN

Current through June 17, 2024
005.01 Developing
				and Implementing
24-005.01A A system must
				develop and implement a monitoring plan to be kept on file for Department and
				public review. The monitoring plan must contain the following elements and be
				complete no later than the date the system conducts its monitoring under this
				chapter.
1. Monitoring locations;
2. Monitoring dates;
3. Compliance calculation procedures;
				and
4. Monitoring plans for any
				other systems in the combined distribution system if the Department has reduced
				monitoring requirements.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-007 - ADDITIONAL REQUIREMENTS FOR CONSECUTIVE SYSTEMS

Current through June 17, 2024
007.01 If a
				consecutive system does not add a disinfectant but delivers water that has been
				treated with a primary or residual disinfectant other than ultraviolet light,
				the system must comply with analytical and monitoring requirements for chlorine
				and chloramines in 179 NAC 16-004.03 and 179 NAC 16-005.03 item 1 and the
				compliance requirements in 179 NAC 16-006.03 item 1 and report monitoring
				results under 179 NAC 16-007.03.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-008 - CONDITIONS REQUIRING INCREASED MONITORING

Current through June 17, 2024
008.01 If a system
				is required to monitor at a particular location annually or less frequently
				than annually under 179 NAC
				24-004 or 179 NAC
				24-006, the system must increase
				monitoring to dual sample sets once per quarter (taken every 90 days) at all
				locations if a TTHM sample is > 0.080 mg/L or an HAA5 sample is > 0.060
				mg/L at any location.
008.02 A
				system is in violation of the MCL when the LRAA exceeds the 179 NAC 24 MCLs in
				179 NAC
				2-002.04E2a,
				calculated based on four consecutive quarters of monitoring (or the LRAA
				calculated based on fewer than four quarters of data if the MCL would be
				exceeded regardless of the monitoring results of subsequent quarters). A system
				is in violation of the monitoring requirements for each quarter that a
				monitoring result would be used in calculating an LRAA if the system fails to
				monitor.
008.03 A system may return
				to routine monitoring once the system has conducted increased monitoring for at
				least four consecutive quarters and the LRAA for every monitoring location is
				<= 0.060 mg/L for TTHMs and <= 0.045 mg/L for HAA5s.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-009 - OPERATIONAL EVALUATION LEVELS

Current through June 17, 2024
009.01 A system has
				exceeded the operational evaluation level at any monitoring location where the
				sum of the two previous quarters' TTHM results plus twice the current quarter's
				TTHM result, divided by 4 to determine an average, exceeds 0.080 mg/L, or where
				the sum of the two previous quarters' HAA5 results plus twice the current
				quarter's HAA5 result, divided by 4 to determine an average, exceeds 0.060
				mg/L.
009.02 Operational
				Evaluations
24-009.02A If a system exceeds
				the operational evaluation level, the system must conduct an operational
				evaluation and submit a written report of the evaluation to the Department no
				later than 90 days after being notified of the analytical result that caused
				the system to exceed the operational evaluation level. The written report must
				be made available to the public upon request.
24-009.02B A system's operational evaluation
				must include an examination of system treatment and distribution operational
				practices, including storage tank operations, excess storage capacity,
				distribution system flushing, changes in source(s) or source water quality, and
				treatment changes or problems that may contribute to TTHM and HAA5 formation
				and what steps could be considered to minimize future exceedences.
24-009.02B1 A system may request and the
				Department may allow the system to limit the scope of its evaluation if the
				system is able to identify the cause of the operational evaluation level
				exceedance.
24-009.02B2 A system's
				request to limit the scope of the evaluation does not extend the schedule in
				179 NAC
				24-009.02A for
				submitting the written report. The Department must approve this limited scope
				of evaluation in writing and the system must keep that approval with the
				completed report.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-010 - REQUIREMENTS FOR REMAINING ON REDUCED TTHM AND HAA5 MONITORING BASED ON 179 NAC 16 RESULTS

Current through June 17, 2024
A system may remain on reduced monitoring after the dates
				  identified in 179 NAC 24-003.01 for compliance with 179 NAC 24 only if the
				  system qualified for a 40/30 certification under 40 CFR 141 Subpart U or has
				  received a very small system waiver under 40 CFR 141 Subpart U, plus the system
				  meets the reduced monitoring criteria in 179 NAC 24-006.01 and the system does
				  not change or add monitoring locations from those used for compliance
				  monitoring under 179 NAC 16. If a system's monitoring locations under this
				  chapter differ from its monitoring locations under 179 NAC 16, the system may
				  not remain on reduced monitoring after the dates identified in 179 NAC
				  24-003.01 for compliance with 179 NAC 24.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-011 - REQUIREMENTS FOR REMAINING ON INCREASED TTHM AND HAA5 MONITORING BASED ON 179 NAC 16 RESULTS

Current through June 17, 2024
If a system was on increased monitoring under 179 NAC
				  16-005.02 item 1, the system must remain on increased monitoring until it
				  qualifies for a return to routine monitoring under 179 NAC 24-008.03. The
				  system must conduct increased monitoring under 179 NAC
				  24-008 at the monitoring locations in
				  the monitoring plan developed under 179 NAC
				  24-005 beginning at the date
				  identified in 179 NAC 24-003.01 for compliance with this chapter and remain on
				  increased monitoring until the system qualifies for a return to routine
				  monitoring under 179 NAC 24-008.03.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs) › Section 179-24-012 - REPORTING AND RECORDKEEPING REQUIREMENTS

Current through June 17, 2024
012.01 Reporting
24-012.01A A system must report the following
				information for each monitoring location to the Department within 10 days of
				the end of any quarter in which monitoring is required:
1. Number of samples taken during the last
				quarter.
2. Date and results of
				each sample taken during the last quarter.
3. Arithmetic average of quarterly results
				for the last four quarters for each monitoring location (LRAA), beginning at
				the end of the fourth calendar quarter that follows the compliance date and at
				the end of each subsequent quarter. If the LRAA calculated based on fewer than
				four quarters of data would cause the MCL to be exceeded regardless of the
				monitoring results of subsequent quarters, the system must report this
				information to the Department as part of the first report due following the
				compliance date or anytime thereafter that this determination is made. If a
				system is required to conduct monitoring at a frequency that is less than
				quarterly, the system must make compliance calculations beginning with the
				first compliance sample taken after the compliance date, unless the system is
				required to conduct increased monitoring under 179 NAC
				24-008.
4. Whether, based on 179 NAC
				2-002.04E2a and
				this chapter, the MCL was violated at any monitoring location.
5. Any operational evaluation levels that
				were exceeded during the quarter, and if so, the location and date, and the
				calculated TTHM and HAA5 levels.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-001 - SCOPE AND AUTHORITY

Current through June 17, 2024
These regulations establish or extend treatment technique
				  requirements in lieu of maximum contaminant levels for
Cryptosporidium
. These requirements are in addition to
				  requirements for filtration and disinfection found in Title 179 NAC 13, 17, and
				  19. These regulations apply to all public water systems supplied by a surface
				  water source and all public water systems supplied by a ground water source
				  under the direct influence of surface water. Systems that were subject to 40
				  CRF 141 Subpart W before the effective date of these regulations must continue
				  to comply with the equivalent stage of these regulations upon their effective
				  date. The authority is found in
Neb. Rev. Stat.
§§
									71-5301
				  to
				  71-5313.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-003 - GENERAL REQUIREMENTS

Current through June 17, 2024
003.01
				Applicability
1. Wholesale systems must
				comply with the requirements of this chapter based on the population of the
				largest system in the combined distribution system.
2. The requirements of this chapter for
				filtered systems apply to systems required by Title 179 to provide filtration
				treatment, whether or not the system is currently operating a filtration
				system.
3. The requirements of this
				chapter for unfiltered systems apply only to unfiltered systems that timely met
				and continue to meet the filtration avoidance criteria in 179 NAC 13, 17, and
				19, as applicable.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-004 - SOURCE WATER MONITORING

Current through June 17, 2024
004.01 Source Water
				Monitoring
Systems must conduct the following monitoring on the schedule
				  in 179 NAC 25-004.02 unless they meet the monitoring exemption criteria in 179
				  NAC 25-004.03 or the Department has approved a different sampling
				  schedule.
25-004.01A Filtered systems
				serving at least 10,000 people must sample their source water for
Cryptosporidium
,
E. coli
, and turbidity at
				least monthly for 24 months.
25-004.01B Unfiltered systems serving at
				least 10,000 people must sample their source water for
Cryptosporidium
at least monthly for 24 months.
25-004.01C
Filtered Systems and
E. coli
monitoring
1. Filtered systems serving fewer than 10,000
				people must sample their source water for
E. coli
at least
				once every two weeks for 12 months.
2. A filtered system serving fewer than
				10,000 people may avoid
E. coli
monitoring if the system
				notifies the Department that it will monitor for
Cryptosporidium
as described in 179 NAC
				25-004.01D. The
				system must notify the Department no later than 3 months prior to the date the
				system is otherwise required to start
E. coli
monitoring.
25-004.01D Filtered systems serving fewer
				than 10,000 people must sample their source water for
Cryptosporidium
at least twice per month for 12 months or at least monthly for 24
				months if they meet one of the following, based on monitoring conducted under
				179 NAC
				25-004.01C or 40
				CFR 141 Subpart W:
1. The annual mean
E. coli
concentration is greater than 100
E.
				coli
/100 mL.
2. The system
				does not conduct
E. coli
monitoring as described in 179 NAC
				25-004.01C.
25-004.01E For filtered systems
				serving fewer than 10,000 people, the Department may approve monitoring for an
				indicator other than
E. coli
under 179 NAC
				25-004.01C. The
				Department also may approve an alternative to the
E. coli
concentration in 179 NAC
				25-004.01D item 1
				to trigger
Cryptosporidium
monitoring. This approval by the
				Department must be provided to the system in writing and must include the basis
				for the Department's determination that the alternative indicator and/or
				trigger level will provide a more accurate identification of whether a system
				will exceed the Bin 1
Cryptosporidium
level in 179 NAC
				25-012.
25-004.01F Unfiltered systems serving fewer
				than 10,000 people must sample their source water for
Cryptosporidium
at least twice per month for 12 months or at least monthly for 24
				months.
25-004.01G Systems may
				sample more frequently than required under 179 NAC 25-004 if the sampling
				frequency is evenly spaced throughout the monitoring period.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-005 - SAMPLING SCHEDULES

Current through June 17, 2024
005.01 Systems
				required to conduct source water monitoring must submit a sampling schedule
				that specifies the calendar dates when the system will collect each required
				sample.
25-005.01A Systems must submit
				sampling schedules to the Department no later than three months prior to the
				applicable date listed in 179 NAC 25-004.03 02 or 40 CFR 141 Subpart
				W.
25-005.01B If the Department
				does not respond to a system regarding its sampling schedule, the system must
				sample at the reported schedule.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-006 - SAMPLING LOCATIONS

Current through June 17, 2024
006.01 Systems
				required to conduct source water monitoring must collect samples for each plant
				that treats a surface water or GWUDI source. Where multiple plants draw water
				from the same influent, such as the same pipe or intake, the Department may
				approve one set of monitoring results to be used to satisfy the source water
				monitoring requirements for all plants.
006.02 Systems That Add Chemicals
25-006.02A Systems must collect source water
				samples prior to chemical treatment, such as coagulants, oxidants and
				disinfectants, unless the system meets the condition of 179 NAC
				25-006.02B.
25-006.02B The Department may approve a
				system to collect a source water sample after chemical treatment. To grant this
				approval, the Department must determine that collecting a sample prior to
				chemical treatment is not feasible for the system and that the chemical
				treatment is unlikely to have a significant adverse effect on the analysis of
				the sample.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-007 - ANALYTICAL METHODS

Current through June 17, 2024
007.01
				Cryptosporidium
Systems must analyze for
Cryptosporidium
using
Method 1623: Cryptosporidium
and
Giardia in Water by Filtration/IMS/FA
, 2005, United States
				  Environmental Protection Agency, EPA-815-R- 05-002 or
Method 1622:
				  Cryptosporidium in Water by Filtration/IMS/FA
, 2005, United States
				  Environmental Protection Agency, EPA-815-R- 05-001, which are incorporated by
				  reference or an equivalent method approved by EPA. A copy of these methods may
				  be obtained online from
http://www.epa.gov/safewater/disinfection/lt2
or from
				  the United States Environmental Protection Agency, Office of Ground Water and
				  Drinking Water, 1201 Constitution Ave., NW, Washington, DC 20460 (Telephone:
				  800-426-4791). A copy may be inspected at the office of the Division of Public
				  Health of the Department of Health and Human Services, 301 Centennial Mall
				  South, Lincoln, NE 68509.
25-007.01A
				Systems must analyze at least a 10 liter (L) sample or a packed pellet volume
				of at least 2 milliliter (mL) as generated by the methods listed in 179 NAC
				25-007.01. Systems unable to process a 10 L sample must analyze as much sample
				volume as can be filtered by two filters approved by EPA for the methods listed
				in 179 NAC 25-007.01, up to a packed pellet volume of at least 2 mL.
25-007.01B
Procedure for Matrix
				Spike Samples
25-007.01B1 Matrix
				Spike (MS) samples, as required by the methods in 179 NAC 25-007.01, must be
				spiked and filtered by a laboratory approved for
Cryptosporidium
analysis under 179 NAC
				25-008.
25-007.01B2 If the volume of the MS sample is
				greater than 10 L, the system may filter all but 10 L of the MS sample in the
				field, and ship the filtered sample and the remaining 10 L of source water to
				the laboratory. In this case, the laboratory must spike the remaining 10 L of
				water and filter it through the filter used to collect the balance of the
				sample in the field.
25-007.01C Flow cytometer-counted spiking
				suspensions must be used for MS samples and ongoing precision and recovery
				(OPR) samples.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-008 - APPROVED LABORATORIES

Current through June 17, 2024
008.01
				Cryptosporidium
Systems must have
Cryptosporidium
samples
				  analyzed by a laboratory that is approved under EPA's Laboratory Quality
				  Assurance Evaluation Program for Analysis of
Cryptosporidium
in Water or a laboratory that has been certified for
Cryptosporidium
analysis by an equivalent Department
				  laboratory certification program.
008.02 E. coli
Any laboratory certified by EPA, the National Environmental
				  Laboratory Accreditation Conference or the Department for total coliform or
				  fecal coliform analysis under 179 NAC
				  13-007 is approved for
E.
				  coli
analysis under this chapter when the laboratory uses the same
				  technique for
E. coli
that the laboratory uses for 179 NAC
				  13-007.
008.03 Turbidity
Measurements of turbidity must be made by
1. A Grade I, II, III, or IV licensed water
				operator, or
2. A person who has
				been trained to measure turbidity and has completed Attachment 1 which is
				incorporated herein by reference and has sent it to the Department.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-009 - REPORTING SOURCE WATER MONITORING RESULTS

Current through June 17, 2024
009.01 All systems
				must report results from the required source water monitoring to the Department
				no later than 10 days after the end of the first month following the month when
				the sample is collected.
009.02
				Systems must report the applicable information in 179 NAC
				25-009.02A and
				25-009.02B for
				required source water monitoring.
25-009.02A
				Systems must report the following data elements for each
Cryptosporidium
analysis:
Data element
1. PWS ID.
2. Facility ID.
3. Sample collection date.
4. Sample type (field or matrix
				spike).
5. Sample volume filtered
				(L) to the nearest ¼ L.
6.
				Was 100% of filtered volume examined.
7. Number of oocysts counted.
25-009.02A1 For matrix spike samples, systems
				must also report the sample volume spiked and estimated number of oocysts
				spiked. These data are not required for field samples.
25-009.02A2 For samples in which less than 10
				L is filtered or less than 100% of the sample volume is examined, systems must
				also report the number of filters used and the packed pellet volume.
25-009.02A3 For samples in which less than
				100% of sample volume is examined, systems must also report the volume of
				resuspended concentrate and volume of this resuspension processed through
				immunomagnetic separation.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-010 - REQUIREMENTS WHEN MAKING A SIGNIFICANT CHANGE IN DISINFECTION PRACTICE

Current through June 17, 2024
010.01 Following
				the completion of source water monitoring, a system that plans to make a
				significant change to its disinfection practice, as defined in 179 NAC
				25-010.02, must develop disinfection profiles and calculate disinfection
				benchmarks for
Giardia lamblia
and viruses as described in 179
				NAC
				25-011. Prior to changing the
				disinfection practice, the system must notify the Department and must include
				in this notice the following information:
25-010.01A A completed disinfection profile
				and disinfection benchmark for
Giardia lamblia
and viruses as
				described in 179 NAC
				25-011.
25-010.01B A description of the proposed
				change in disinfection practice.
25-010.01C An analysis of how the proposed
				change will affect the current level of disinfection.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-011 - DEVELOPING THE DISINFECTION PROFILE AND BENCHMARK

Current through June 17, 2024
011.01 Systems
				required to develop disinfection profiles must follow the requirements of 179
				NAC 25-011. Systems must monitor at least weekly for a period of 12 consecutive
				months to determine the total log inactivation for
Giardia lamblia
and viruses. If systems monitor more frequently, the monitoring
				frequency must be evenly spaced. Systems that operate for fewer than 12 months
				per year must monitor weekly during the period of operation. Systems must
				determine log inactivation for
Giardia lamblia
through the
				entire plant, based on contact time (CT)99.9 values in
				Tables 13.1 through 13.8 of 179 NAC
				13-007.02C5 as
				applicable. Systems must determine log inactivation for viruses through the
				entire treatment plant based on a protocol approved by the
				Department.
011.02 Systems with a
				single point of disinfectant application prior to the entrance to the
				distribution system must conduct the monitoring in 179 NAC 25-011.02A through
				011.02D. Systems
				with more than one point of disinfectant application must conduct the
				monitoring in 179 NAC 25-011.02A through
				25-011.02D for
				each disinfection segment. Systems must monitor the parameters necessary to
				determine the total inactivation ratio, using analytical methods in 179 NAC
				13-007.01.
25-011.02A For systems using a
				disinfectant other than UV, the temperature of the disinfected water must be
				measured at each residual disinfectant concentration sampling point during peak
				hourly flow or at an alternative location approved by the Department.
25-011.02B For systems using chlorine, the pH
				of the disinfected water must be measured at each chlorine residual
				disinfectant concentration sampling point during peak hourly flow or at an
				alternative location approved by the Department.
25-011.02C The disinfectant contact time(s)
				(t) must be determined during peak hourly flow.
25-011.02D The residual disinfectant
				concentration(s) (C) of the water before or at the first customer and prior to
				each additional point of disinfectant application must be measured during peak
				hourly flow.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-012 - BIN CLASSIFICATION FOR FILTERED SYSTEMS

Current through June 17, 2024
012.01 Following
				completion of required source water monitoring, filtered systems must calculate
				a
Cryptosporidium
bin concentration for each plant for which
				monitoring was required. Calculation of the bin concentration must use the
Cryptosporidium
results reported under 179 NAC 25-004.01 or 40
				CFR 141 Subpart W and must follow the following procedures:
012.02 Procedures for Bin Classification
25-012.02A For systems that collect a total
				of at least 48 samples, the bin concentration is equal to the arithmetic mean
				of all sample concentrations.
25-012.02B For systems that collect a total
				of at least 24 samples, but not more than 47 samples, the bin concentration is
				equal to the highest arithmetic mean of all sample concentrations in any 12
				consecutive months during which
Cryptosporidium
samples were
				collected.
25-012.02C For systems
				that serve fewer than 10,000 people and monitor for
Cryptosporidium
for only one year (i.e., collect 24 samples in 12 months), the bin
				concentration is equal to the arithmetic mean of all sample
				concentrations.
25-012.02D For
				systems with plants operating only part of the year that monitor fewer than 12
				months per year under 179 NAC 25-004.04, the bin concentration is equal to the
				highest arithmetic mean of all sample concentrations during any year of
Cryptosporidium
monitoring.
25-012.02E If the monthly
Cryptosporidium
sampling frequency varies, systems must first
				calculate a monthly average for each month of monitoring. Systems must then use
				these monthly average concentrations, rather than individual sample
				concentrations, in the applicable calculation for bin classification in 179 NAC
				25-012.02A
				through
				25-012.02D.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-013 - FILTERED SYSTEM ADDITIONAL CRYPTOSPORIDIUM TREATMENT REQUIREMENTS

Current through June 17, 2024
013.01 Filtered
				systems must provide the level of additional treatment for
Cryptosporidium
specified in 179 NAC 25-013 based on their bin
				classification as determined under 179 NAC
				25-012 or 40 CFR 141 Subpart W and
				according to the schedule in 179 NAC
				25-015 or 40 CFR 141 Subpart W.
If the system bin classification is . . .
And the system uses the following filtration
						  treatment in full compliance with 179 NAC 13, 17 and 19 (as applicable), then
						  the additional
Cryptosporidium
treatment requirements are . .
						  .
Conventional filtration treatment (including softening)
Direct filtration
Slow sand or diatomaceous earth filtration
Alternative filtration technologies
Bin 1
No additional treatment
No additional treatment
No additional treatment
No additional treatment
Bin 2
1-log treatment
1.5-log treatment
1-log treatment
(1)
Bin 3
2-log treatment
2.5-log treatment
2-log treatment
(2)
Bin 4
2.5-log treatment
3-log treatment
2.5-log treatment
(3)
1 As determined by the Department
				  such that the total
Cryptosporidium
removal and inactivation
				  is at least 4.0-log.
2 As determined by the Department
				  such that the total
Cryptosporidium
removal and inactivation
				  is at least 5.0-log.
3 As determined by the Department
				  such that the total
Cryptosporidium
removal and inactivation
				  is at least 5.5-log.
013.02
				Required Cryptosporidium Treatment
25-013.02A
				Filtered systems must use one or more of the treatment and management options
				listed in 179 NAC
				25-017, termed the microbial toolbox,
				to comply with the additional
Cryptosporidium
treatment
				required in 179 NAC 25-013.01.
25-013.02B Systems classified in Bin 3 and
				Bin 4 must achieve at least 1-log of the additional
Cryptosporidium
treatment required under 179 NAC 25-013.01 using either one or a
				combination of the following: bag filters, bank filtration, cartridge filters,
				chlorine dioxide, membranes, ozone, or UV, as described in 179 NAC
				25-018 through 179 NAC
				25-022.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-014 - UNFILTERED SYSTEM CRYPTOSPORIDIUM TREATMENT REQUIREMENTS

Current through June 17, 2024
014.01
				Determination of Mean Cryptosporidium Level
25-014.01A Following completion of the source
				water monitoring, unfiltered systems must calculate the arithmetic mean of all
Cryptosporidium
sample concentrations. Systems must report
				this value to the Department for approval no later than six months after the
				month the system is required to complete source water monitoring.
25-014.01B If the monthly
Cryptosporidium
sampling frequency varies, systems must first
				calculate a monthly average for each month of monitoring. Systems must then use
				these monthly average concentrations, rather than individual sample
				concentrations, in the calculation of the mean
Cryptosporidium
level.
25-014.01C The
				report to the Department of the mean
Cryptosporidium
levels
				must include a summary of the source water monitoring data used for the
				calculation.
25-014.01D Failure to
				comply with the conditions of 179 NAC 25-014.01 is a violation of the treatment
				technique requirement.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-015 - SCHEDULE FOR COMPLIANCE WITH CRYPTOSPORIDIUM TREATMENT REQUIREMENTS

Current through June 17, 2024
015.01 Following
				bin classification, filtered systems must provide the level of treatment for
Cryptosporidium
required under 179 NAC
				25-013 according to the schedule in
				179 NAC 25-015.03 or according to a schedule set by the Department.
015.02 Following determination of the mean
Cryptosporidium
level, unfiltered systems must provide the
				level of treatment for
Cryptosporidium
required under 179 NAC
				25-014 according to the schedule in
				179 NAC 25-015.03 or according to a schedule set by the Department.
015.03 Cryptosporidium Treatment Compliance
				Dates
Cryptosporidium Treatment Compliance Dates Table
Systems that serve . . .
Must comply with
Cryptosporidium
treatment requirements no later than . . . 
						  a
(1) At least 100,000 people
the effective date of these regulations
(2) From 50,000 to 99,999 people
the effective date of these regulations
(3) From 10,000 to 49,999 people
October 1, 2013
(4) Fewer than 10,000 people
October 1, 2014
a The Department may allow up to
				  an additional two years for complying with the treatment requirement for
				  systems making capital improvements.
015.04 If the bin classification for a
				filtered system changes following source water monitoring, as determined under
				179 NAC 25-012.04, the system must provide the level of treatment for
Cryptosporidium
required under 179 NAC
				25-013 on a schedule the Department
				approves.
015.05 If the mean
Cryptosporidium
level for an unfiltered system changes
				following source water monitoring, and if the system must provide a different
				level of
Cryptosporidium
treatment under 179 NAC
				25-014 due to this change, the system
				must meet this treatment requirement on a schedule the Department
				approves.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-016 - REQUIREMENTS FOR UNCOVERED FINISHED WATER STORAGE FACILITIES

Current through June 17, 2024
Uncovered finished water storage facilities are not
				  allowed.
016.01 Failure to comply with
				the requirements of 179 NAC 25-016 is a violation of the treatment technique
				requirement.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-017 - MICROBIAL TOOLBOX OPTIONS FOR MEETING CRYPTOSPORIDIUM TREATMENT REQUIREMENTS

Current through June 17, 2024
017.01 Credits
25-017.01A Systems receive the treatment
				credits listed in the table in 179 NAC 25-017.02 by meeting the conditions for
				microbial toolbox options described in 179 NAC
				25-018 through 179 NAC
				25-022. Systems apply these treatment
				credits to meet the treatment requirements in 179 NAC
				25-013 or
				25-014, as applicable.
25-017.01B Unfiltered systems are eligible
				for treatment credits for the microbial toolbox options described in 179 NAC
				25-022 only.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-019 - PRE-FILTRATION TREATMENT TOOLBOX COMPONENTS

Current through June 17, 2024
019.01
				Presedimentation
Systems receive 0.5-log
Cryptosporidium
treatment credit for a presedimentation basin during any month the
				  process meets the following criteria:
1. The presedimentation basin must be in
				continuous operation and must treat the entire plant flow taken from a surface
				water or GWUDI source.
2. The
				system must continuously add a coagulant to the presedimentation
				basin.
3. The presedimentation
				basin must achieve the following performance criteria:
a. Demonstrates at least 0.5-log mean
				reduction of influent turbidity. This reduction must be determined using daily
				turbidity measurements in the presedimentation process influent and effluent
				and must be calculated as follows: log10(monthly mean of
				daily influent turbidity) - log10(monthly mean of daily
				effluent turbidity).
b. Complies
				with Department-approved performance criteria that demonstrate at least 0.5-log
				mean removal of micron-sized particulate material through the presedimentation
				process.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-020 - TREATMENT PERFORMANCE TOOLBOX COMPONENTS

Current through June 17, 2024
020.01 Combined
				Filter Performance
Systems using conventional filtration treatment or direct
				  filtration treatment receive an additional 0.5-log
Cryptosporidium
treatment credit during any month the system meets the criteria in
				  this paragraph. Combined filter effluent (CFE) turbidity must be less than or
				  equal to 0.15 NTU in at least 95% of the measurements. Turbidity must be
				  measured as described in 179 NAC 13-007.01 and 13-007.03.
020.02 Individual Filter Performance
Systems using conventional filtration treatment or direct
				  filtration treatment receive 0.5-log
Cryptosporidium
treatment
				  credit, which can be in addition to the 0.5-log credit under 179 NAC 25-020.01,
				  during any month the system meets the criteria in this paragraph. Compliance
				  with these criteria must be based on individual filter turbidity monitoring as
				  described in 179 NAC
				  17-006 or
				  19-010, as applicable.
25-020.02A The filtered water turbidity for
				each individual filter must be less than or equal to 0.15 NTU in at least 95%
				of the measurements recorded each month.
25-020.02B No individual filter may have a
				measured turbidity greater than 0.3 NTU in two consecutive measurements taken
				15 minutes apart.
25-020.02C Any
				system that has received treatment credit for individual filter performance and
				fails to meet the requirements of 179 NAC
				25-020.02A or
				25-020.02B during
				any month does not receive a treatment technique violation under 179 NAC
				25-013.03 if the Department determines the following:
1. The failure was due to unusual and
				short-term circumstances that could not reasonably be prevented through
				optimizing treatment plant design, operation, and maintenance.
2. The system has experienced no more than
				two such failures in any calendar year.
Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-022 - INACTIVATION TOOLBOX COMPONENTS

Current through June 17, 2024
022.01 Calculation
				of CT Values
25-022.01A CT is the product of
				the disinfectant contact time (T, in minutes) and disinfectant concentration
				(C, in milligrams per liter). Systems with treatment credit for chlorine
				dioxide or ozone under 179 NAC 25-022.02 or 25-022.03 must calculate CT at
				least once each day, with both C and T measured during peak hourly flow as
				specified in 179 NAC 13-007.01 through 13-007.02.
25-022.01B Systems with several disinfection
				segments in sequence may calculate CT for each segment, where a disinfection
				segment is defined as a treatment unit process with a measurable disinfectant
				residual level and a liquid volume. Under this approach, systems must add the
Cryptosporidium
CT values in each segment to determine the
				total CT for the treatment plant.