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COLCHESTER SEWER & WATER COMMISSION

Connecticut — Community Water System — PWSID: CT0280011

System Information

PWSIDCT0280011
System NameCOLCHESTER SEWER & WATER COMMISSION
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region01
Serves SchoolNo
WholesalerNo
First ReportedMar 8, 1979
Last ReportedDec 15, 2025

Location & Contact

StateConnecticut
CityCOLCHESTER
ZIP Code06415
Address127 Norwich Ave
OrganizationLEONE, JOSEPH D.
Phone860-537-7288

Population & Service

Population Served4,020
Service Connections2,100

Drinking Water Violations (159)

This water system has 159 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Aug 10, 2025 — Consumer Confidence Rule Other No No — — — Resolved Aug 29, 2025 Consumer Confidence Rule
Jul 1, 2025 — Consumer Confidence Rule Other No No — — — Resolved Jul 25, 2025 Consumer Confidence Rule
Jun 15, 2025 — Public Notice Other No No — — — Resolved Aug 29, 2025 Public Notice Rule and Revised PN Rule
Jun 15, 2025 — Public Notice Other No No — — — Resolved Aug 29, 2025 Public Notice Rule and Revised PN Rule
May 25, 2024 — Public Notice Other No No — — — Resolved Aug 29, 2025 Public Notice Rule and Revised PN Rule
May 25, 2024 — Public Notice Other No No — — — Resolved Aug 29, 2025 Public Notice Rule and Revised PN Rule
Mar 1, 2024 Mar 31, 2024 E. COLI MR No Yes — — — Resolved Mar 31, 2024 Ground Water Rule
Mar 1, 2024 Mar 31, 2024 E. COLI MR No Yes — — — Resolved Mar 31, 2024 Ground Water Rule
Mar 1, 2024 Mar 31, 2024 E. COLI MR No Yes — — — Resolved Mar 31, 2024 Ground Water Rule
Mar 1, 2024 Mar 31, 2024 E. COLI MR No Yes — — — Resolved Mar 31, 2024 Ground Water Rule
Jan 1, 2024 Jan 31, 2024 E. COLI MR No Yes — — — Resolved Jan 31, 2024 Ground Water Rule
Jan 1, 2024 Jan 31, 2024 E. COLI MR No Yes — — — Resolved Jan 31, 2024 Ground Water Rule
Jan 1, 2024 Dec 31, 2024 TTHM MR No Yes — 0.080 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 TTHM MR No Yes — 0.080 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 TTHM MR No Yes — 0.080 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Jan 31, 2024 E. COLI MR No Yes — — — Resolved Jan 31, 2024 Ground Water Rule
Jan 1, 2024 Jan 31, 2024 E. COLI MR No Yes — — — Resolved Jan 31, 2024 Ground Water Rule
Jan 1, 2024 Dec 31, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 — Consumer Confidence Rule Other No No — — — Resolved Jul 17, 2023 Consumer Confidence Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Nov 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Nov 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Nov 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Nov 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2021 — Consumer Confidence Rule Other No No — — — Resolved Jul 2, 2021 Consumer Confidence Rule
Jul 1, 2021 — Consumer Confidence Rule Other No No — — — Resolved Jul 2, 2021 Consumer Confidence Rule
Feb 27, 2020 — Public Notice Other No No — — — Resolved Jun 30, 2020 Public Notice Rule and Revised PN Rule
Feb 27, 2020 — Public Notice Other No No — — — Resolved Jun 30, 2020 Public Notice Rule and Revised PN Rule
Feb 26, 2020 — Public Notice Other No No — — — Resolved Jun 30, 2020 Public Notice Rule and Revised PN Rule
Feb 26, 2020 — Public Notice Other No No — — — Resolved Jun 30, 2020 Public Notice Rule and Revised PN Rule
Oct 1, 2019 Dec 31, 2019 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2019 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2019 Dec 31, 2019 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2019 Stage 1 Disinfectants and Disinfection Byproducts Rule
Mar 1, 2019 Mar 31, 2019 E. COLI MR No Yes — — — Resolved Mar 31, 2019 Ground Water Rule
Mar 1, 2019 Mar 31, 2019 E. COLI MR No Yes — — — Resolved Mar 31, 2019 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2018 Revised Total Coliform Rule
Dec 1, 2018 Dec 31, 2018 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2018 Revised Total Coliform Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2018 Revised Total Coliform Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule
Dec 1, 2018 Dec 31, 2018 E. COLI MR No Yes — — — Resolved Dec 31, 2018 Ground Water Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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