Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CT0450011
PWS Name	EAST LYME WATER & SEWER COMMISSION
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	15245
County Served	New London

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	9188127	Returned to Compliance	01-OCT-2024	31-DEC-2024	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	9188126	Returned to Compliance	01-OCT-2024	31-DEC-2024	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	9188081	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	9188032	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	9188122	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	9188070	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	9188119	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	9188069	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	9188118	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	9188068	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	9188117	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	9188116	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	9188067	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	9188114	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	9188065	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	9188112	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	9188063	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	9188111	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	9188062	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	9188061	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	9188110	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	9188060	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	9188109	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	9188108	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	9188059	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	9188058	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	9188107	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	9188057	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	9188106	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	9188104	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	9188055	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	9188054	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	9188103	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	9188102	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	9188053	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	9188101	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	9188052	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	9188048	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	9188097	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	9188082	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	9188033	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	9188073	Returned to Compliance	01-JAN-2021	31-DEC-2021	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	9188025	Returned to Compliance	01-JUL-2020	-	No
MR	Monitoring, Source Water (GWR)	Ground Water Rule	E. COLI	9187973	Returned to Compliance	20-SEP-2018	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	9187982	Returned to Compliance	01-JUL-2018	30-SEP-2018	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	9188023	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	9187984	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	9188024	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Pentachlorophenol	9188017	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Benzo(a)pyrene	9188016	Returned to Compliance	01-JAN-2017	31-DEC-2019	No

1 - 50 of 218

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9116864	9188127	SIF	State Public Notification received	01-MAY-2025	State	-
9116864	9188126	SIF	State Public Notification received	01-MAY-2025	State	-
9116853	9188032	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188122	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188048	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188052	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188053	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188054	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188055	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188057	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188058	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188059	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188060	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188061	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188062	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188063	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188065	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188067	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188068	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188069	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188070	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188073	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188081	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188082	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188097	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188101	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188102	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188103	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188104	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188106	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188107	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188108	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188109	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188110	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188111	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188112	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188114	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188116	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188117	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188118	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188119	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116853	9188033	SOX	State Compliance achieved	31-DEC-2022	State	Monitoring Resumed
9116847	9187984	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9188025	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187986	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187987	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187990	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187991	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187992	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.
9116847	9187993	SOX	State Compliance achieved	05-MAY-2020	State	Sample data received.

1 - 50 of 218

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
INTERCONNECTION - CT0950011 - NEW LONDON	58948	Yes	Consecutive Connection	Surface water	Seasonal	Active
WELL 2	27850	Yes	Well	Ground water	Permanent	Inactive
WELL 5	27411	Yes	Well	Ground water	Permanent	Inactive
WELL 5A	62868	Yes	Well	Ground water	Permanent	Active
WELL 3B	57524	Yes	Well	Ground water	Permanent	Active
WELL 1A	49235	Yes	Well	Ground water	Permanent	Active
WELL 6	47254	Yes	Well	Ground water	Permanent	Active
WELL 4A	36817	Yes	Well	Ground water	Permanent	Active
WELL 3A	27852	Yes	Well	Ground water	Permanent	Active
WELL 4 DODGE POND	27853	Yes	Well	Ground water	Other	Inactive
WELL 2A	56404	Yes	Well	Ground water	Interim	Active
WELL 3	27851	Yes	Well	Ground water	Emergency	Inactive
WELL 1	27849	Yes	Well	Ground water	Emergency	Inactive
DISTRIBUTION SYSTEM	20765	No	Distribution System/Zone	-	-	Active
SLEEPY HOLLOW PUMP STATION	50080	No	Pump Facility	-	-	Active
ORCHARD WOODS PUMP STATION	52047	No	Pump Facility	-	-	Active
DEERFIELD AKA KING ARTHUR PUMP STATION	52141	No	Pump Facility	-	-	Active
CEDAR BROOK PUMP STATION	52143	No	Pump Facility	-	-	Active
CHAPMAN WOODS PUMP STATION	52145	No	Pump Facility	-	-	Active
VILLAGE DRIVE PUMP STATION	52149	No	Pump Facility	-	-	Active
ANCIENT HIGHWAY PUMP STATION	52153	No	Pump Facility	-	-	Active
MACKINNON PLACE PUMP STATION	52157	No	Pump Facility	-	-	Active
SUNRISE TRAIL PUMP STATION	52161	No	Pump Facility	-	-	Active
JEAN DRIVE PUMP STATION	52165	No	Pump Facility	-	-	Active
EAST LYME PUMP STATION	58952	No	Pump Facility	-	-	Active
NEW LONDON PUMP STATION	58954	No	Pump Facility	-	-	Active
GATEWAY COMMONS PUMP STATION	59629	No	Pump Facility	-	-	Active
BRIDE BROOK ENTRY POINT-WELLS 2A,3A & 3B	45789	No	Sampling Station	-	-	Active
WELL 4A WTP ENTRY POINT	45791	No	Sampling Station	-	-	Active
WELL 5A WTP ENTRY POINT	45792	No	Sampling Station	-	-	Active
DARROW POND ENTRY POINT	56405	No	Sampling Station	-	-	Active
ENTRY POINT WELL 1A & WELL 6	62253	No	Sampling Station	-	-	Active
ENTRY POINT	38678	No	Sampling Station	-	-	Inactive
WELL 3A WTP ENTRY POINT	45787	No	Sampling Station	-	-	Inactive
INDUSTRIAL PARK ROAD WTP ENTRY POINT	45788	No	Sampling Station	-	-	Inactive
WELL 2 WTP ENTRY POINT	45790	No	Sampling Station	-	-	Inactive
WELL 6 WTP ENTRY POINT	48378	No	Sampling Station	-	-	Inactive
SLEEP HOLLOW ELDERLY HOUSING TANK	50078	No	Storage	-	-	Active
ORCHARD WOODS TANK	52045	No	Storage	-	-	Active
ROXBURY ROAD STORAGE TANK	52137	No	Storage	-	-	Active
BOSTON POST ROAD STORAGE TANK	52139	No	Storage	-	-	Active
CHAPMAN WOOD HYDROPNEUMATIC STORAGE TANK	52147	No	Storage	-	-	Active
ANCIENT HWY HYDROPNEUMATIC STORAGE TANK	52155	No	Storage	-	-	Active
JEAN DRIVE HYDROPNEUMATIC STORAGE TANK	52167	No	Storage	-	-	Active
BUTLERTOWN ROAD TANK	58950	No	Storage	-	-	Active
DEERFIELD HYDROPNEUMATIC STORAGE TANK	58971	No	Storage	-	-	Active
CEDAR BROOK HYDROPNEUMATIC STORAGE TANK	58973	No	Storage	-	-	Active
VILLAGE DR HYDROPNEUMATIC STORAGE TANK	52151	No	Storage	-	-	Inactive
MACKINNON PL HYDROPNEUMATIC STORAGE TANK	52159	No	Storage	-	-	Inactive
SUNRISE TRL HYDROPNEUMATIC STORAGE TANK	52163	No	Storage	-	-	Inactive

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
WELL 5A WTP	10963	Filtration, Greensand	Iron removal
WELL 5A WTP	10963	Permanganate	Iron removal
WELL 5A WTP	10963	Filtration, Greensand	Manganese removal
WELL 5A WTP	10963	Fluoridation	Other
WELL 5A WTP	10963	pH Adjustment	Corrosion control
WELL 5A WTP	10963	Hypochlorination, Post	Disinfection
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	Fluoridation	Other
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	pH Adjustment	Corrosion control
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	Sequestration	Iron removal
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	Sequestration	Manganese removal
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	Activated Carbon, Granular	Organics removal
WELL 1A (INDUSTRIAL PARK ROAD) WTP	36285	Hypochlorination, Post	Disinfection
WELL 2A WTP	36286	pH Adjustment	Corrosion control
WELL 2A WTP	36286	Fluoridation	Other
WELL 2A WTP	36286	Sequestration	Iron removal
WELL 2A WTP	36286	Sequestration	Manganese removal
WELL 2A WTP	36286	Hypochlorination, Post	Disinfection
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Filtration, Greensand	Iron removal
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Filtration, Greensand	Manganese removal
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Hypochlorination, Post	Disinfection
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Fluoridation	Other
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	pH Adjustment, Post	Corrosion control
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Hypochlorination, Pre	Iron removal
BRIDE BROOK - WELLS 2A,3A, & 3B TP	36287	Inhibitor, Orthophosphate	Corrosion control
WELL 4A WTP	36288	pH Adjustment	Corrosion control
WELL 4A WTP	36288	Filtration, Greensand	Iron removal
WELL 4A WTP	36288	Fluoridation	Other
WELL 4A WTP	36288	Filtration, Greensand	Manganese removal
WELL 4A WTP	36288	Hypochlorination, Post	Disinfection
WELL 4A WTP	36288	Hypochlorination, Pre	Iron removal
WELL 3 WTP	45754	pH Adjustment	Corrosion control
WELL 3 WTP	45754	Fluoridation	Other
WELL 3 WTP	45754	Filtration, Greensand	Manganese removal
WELL 3 WTP	45754	Filtration, Greensand	Iron removal
WELL 1A & WELL 6 WTP	51322	pH Adjustment	Corrosion control
WELL 1A & WELL 6 WTP	51322	Filtration, Greensand	Iron removal
WELL 1A & WELL 6 WTP	51322	Permanganate	Iron removal
WELL 1A & WELL 6 WTP	51322	Filtration, Greensand	Manganese removal
WELL 1A & WELL 6 WTP	51322	Fluoridation	Other
WELL 1A & WELL 6 WTP	51322	Hypochlorination, Post	Disinfection
WELL 1A & WELL 6 WTP	51322	Inhibitor, Orthophosphate	Corrosion control
WELL 3A/3B WTP	51482	pH Adjustment	Corrosion control
WELL 3A/3B WTP	51482	Fluoridation	Other
WELL 3A/3B WTP	51482	Sequestration	Iron removal
WELL 3A/3B WTP	51482	Sequestration	Manganese removal

1 - 45 of 45

For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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