Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CT0280011
PWS Name	COLCHESTER SEWER & WATER COMMISSION
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	4020
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
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	75399	Returned to Compliance	10-AUG-2025	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	75400	Returned to Compliance	01-JUL-2025	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	75398	Returned to Compliance	15-JUN-2025	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	75397	Returned to Compliance	15-JUN-2025	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	75394	Returned to Compliance	25-MAY-2024	-	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75392	Returned to Compliance	01-MAR-2024	31-MAR-2024	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	75396	Returned to Compliance	01-JAN-2024	31-DEC-2024	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	75395	Returned to Compliance	01-JAN-2024	31-DEC-2024	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75393	Returned to Compliance	01-JAN-2024	31-JAN-2024	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	75391	Returned to Compliance	01-JUL-2023	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75390	Returned to Compliance	01-OCT-2022	31-DEC-2022	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	75389	Returned to Compliance	01-JUL-2021	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	75384	Returned to Compliance	27-FEB-2020	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	75385	Returned to Compliance	26-FEB-2020	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75383	Returned to Compliance	01-OCT-2019	31-DEC-2019	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75377	Returned to Compliance	01-MAR-2019	31-MAR-2019	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75369	Returned to Compliance	01-DEC-2018	31-DEC-2018	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	75371	Returned to Compliance	01-DEC-2018	31-DEC-2018	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75368	Returned to Compliance	01-DEC-2018	31-DEC-2018	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	75370	Returned to Compliance	01-DEC-2018	31-DEC-2018	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75376	Returned to Compliance	01-OCT-2018	31-DEC-2018	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75366	Returned to Compliance	01-APR-2016	30-JUN-2016	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75365	Returned to Compliance	01-JUL-2015	30-SEP-2015	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	75364	Returned to Compliance	01-NOV-2014	30-NOV-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	75347	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	75346	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	75345	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	75343	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	75342	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	75341	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	75340	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	75336	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	75321	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	75348	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	75349	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	75350	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	75351	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	75353	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	75355	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	75356	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	75357	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	75358	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	75361	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	75320	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75264	Returned to Compliance	01-JUL-2013	30-SEP-2013	No
MR	Monitoring, Regular	Inorganic Chemicals	Asbestos	75387	Known	01-JAN-2012	31-DEC-2020	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	75260	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	71009	Returned to Compliance	01-JUL-2008	30-SEP-2008	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	70908	Returned to Compliance	01-APR-2008	30-JUN-2008	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	66607	Returned to Compliance	01-JUL-2007	-	No

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
74778	75396	SOX	State Compliance achieved	31-DEC-2025	State	Monitoring Resumed
74778	75395	SOX	State Compliance achieved	31-DEC-2025	State	Monitoring Resumed
74781	75397	SOX	State Compliance achieved	29-AUG-2025	State	-
74780	75392	SIF	State Public Notification received	29-AUG-2025	State	-
74785	75390	SIF	State Public Notification received	29-AUG-2025	State	-
74782	75393	SIF	State Public Notification received	29-AUG-2025	State	-
74779	75398	SOX	State Compliance achieved	29-AUG-2025	State	-
74788	75399	SOX	State Compliance achieved	29-AUG-2025	State	-
74784	75394	SOX	State Compliance achieved	29-AUG-2025	State	-
74787	75400	SOX	State Compliance achieved	25-JUL-2025	State	-
74768	75391	SOX	State Compliance achieved	17-JUL-2023	State	2022 CCR completed
74763	75389	SIA	State Violation/Reminder Notice	15-JUN-2022	State	-
74761	75387	SIF	State Public Notification received	03-DEC-2021	State	-
74758	75369	SIF	State Public Notification received	25-OCT-2021	State	-
74758	75368	SIF	State Public Notification received	25-OCT-2021	State	-
74760	75370	SIF	State Public Notification received	25-OCT-2021	State	-
74760	75371	SIF	State Public Notification received	25-OCT-2021	State	-
74751	75385	SIA	State Violation/Reminder Notice	23-SEP-2020	State	-
74751	75384	SIA	State Violation/Reminder Notice	23-SEP-2020	State	-
74748	75383	SIA	State Violation/Reminder Notice	23-JAN-2020	State	-
74744	75377	SIA	State Violation/Reminder Notice	28-MAY-2019	State	-
74741	75376	SOX	State Compliance achieved	06-MAR-2019	State	Results Received
74732	75366	SOX	State Compliance achieved	03-NOV-2016	State	results received
74729	75365	SOX	State Compliance achieved	23-DEC-2015	State	results received
74726	75364	SIF	State Public Notification received	06-MAY-2015	State	-
74724	75349	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75320	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75321	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75336	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75340	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75341	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75342	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75343	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75345	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75346	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75347	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75348	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75361	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75358	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75357	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75356	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75355	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75353	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75350	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74724	75351	SIA	State Violation/Reminder Notice	23-APR-2015	State	-
74720	75264	SOX	State Compliance achieved	26-FEB-2014	State	Results Received
74713	75260	SOX	State Compliance achieved	22-MAR-2010	State	-
74609	70908	SOX	State Compliance achieved	24-DEC-2008	State	results received
74409	71009	SOX	State Compliance achieved	15-DEC-2008	State	results received
73507	66607	SIA	State Violation/Reminder Notice	06-SEP-2007	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL 5	27800	Yes	Well	Ground water	Emergency	Active
WELL 4	27803	Yes	Well	Ground water	Seasonal	Active
WELL 4A	27802	Yes	Well	Ground water	Permanent	Inactive
WELL 3A	62210	Yes	Well	Ground water	Permanent	Active
WELL 5A	53574	Yes	Well	Ground water	Permanent	Active
WELL 3	27801	Yes	Well	Ground water	Permanent	Active
WELL 2A	27799	Yes	Well	Ground water	Emergency	Inactive
WELL 1	27798	Yes	Well	Ground water	Emergency	Inactive
TAINTOR HILL ROAD CLEAR WELL	56459	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	20075	No	Distribution System/Zone	-	-	Active
ELMWOOD BOOSTER STATION	52023	No	Pump Facility	-	-	Active
CABIN ROAD WTP ENTRY POINT	38811	No	Sampling Station	-	-	Active
WELL #4 WTP ENTRY POINT	45771	No	Sampling Station	-	-	Active
ELMWOOD STANDPIPE	49781	No	Storage	-	-	Active
ELMWOOD STANDPIPE 2	49783	No	Storage	-	-	Active
HIGHLAND STANDPIPE	49785	No	Storage	-	-	Active
CABIN RD TOWER CLEARWELL	52017	No	Storage	-	-	Active
CABIN ROAD TREATMENT PLANT	36243	No	Treatment Plant	-	-	Active
WELL #4 TREATMENT PLANT	36244	No	Treatment Plant	-	-	Active
ELMWOOD BOOSTER STATION	49779	No	Treatment Plant	-	-	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
CABIN ROAD TREATMENT PLANT	36243	Hypochlorination, Post	Disinfection
CABIN ROAD TREATMENT PLANT	36243	Inhibitor, Polyphosphate	Corrosion control
CABIN ROAD TREATMENT PLANT	36243	Aeration, Packed Tower	Organics removal
CABIN ROAD TREATMENT PLANT	36243	Filtered	Manganese removal
CABIN ROAD TREATMENT PLANT	36243	Filtered	Iron removal
CABIN ROAD TREATMENT PLANT	36243	Hypochlorination, Pre	Disinfection
WELL #4 TREATMENT PLANT	36244	pH Adjustment	Corrosion control
WELL #4 TREATMENT PLANT	36244	Hypochlorination, Post	Disinfection
WELL #4 TREATMENT PLANT	36244	Sequestration	Iron removal
ELMWOOD BOOSTER STATION	49779	Hypochlorination, Post	Disinfection

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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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