County · Connecticut
New London County, Connecticut: drinking water records
This overview covers 33 ZIP codes and 83 community water systems in New London County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Norwich Public Utilities CT1040011 | 36,163 | 300 | 5 | 6 | 0 ppb |
| Jewett City Water Company CT0580011 | 6,840 | 180 | 1 | 1 | 0 ppb |
| Groton Utilities CT0590011 | 30,200 | 120 | 0 | 0 | 0 ppb |
| New London Dept. of Public Utilities CT0950011 | 27,620 | 120 | 0 | 0 | 0 ppb |
| Waterford Wpca CT1520071 | 16,578 | 120 | 0 | 0 | 1.5 ppb |
| East Lyme Water & Sewer Commission CT0450011 | 15,245 | 420 | 6 | 0 | 0 ppb |
| Aquarion-Mystic CT1370011 | 10,788 | 180 | 1 | 0 | 3 ppb |
| Colchester Sewer & Water Commission CT0280011 | 4,020 | 240 | 2 | 0 | 0 ppb |
| Ledyard Wpca - Ledyard Center CT0727091 | 3,294 | 0 | 0 | 3 | 0 ppb |
| Scwa, Tower-Ferry View Division CT0720041 | 2,567 | 0 | 0 | 1 | 3.3 ppb |
| Scwa, North Stonington Division (Nst) CT1020021 | 1,860 | 0 | 0 | 1 | 1.9 ppb |
| Scwa, Oakdale Heights Division CT0860031 | 876 | 0 | 0 | 1 | 7.6 ppb |
| Preston Plains Water Company CT1140011 | 550 | 0 | 0 | 1 | 5.3 ppb |
| Scwa, Cedar Ridge Division CT1020011 | 370 | 0 | 0 | 1 | 0 ppb |
| Chadwick Homeowners Assn., INC. CT1050011 | 292 | 0 | 0 | 1 | 0 ppb |
| St. Thomas More School-Main System CT0861251 | 270 | 0 | 0 | 1 | 1.1 ppb |
| Westchester Hills Condominium Assn. CT0280031 | 225 | 0 | 0 | 1 | 0 ppb |
| Colchester Commons CT0286011 | 224 | 0 | 0 | 2 | 0 ppb |
| Carefree Homeowners Association CT0710011 | 172 | 0 | 0 | 1 | 0 ppb |
| Lincoln Park Elderly Housing CT1140021 | 80 | 0 | 0 | 1 | 0.6 ppb |
| Northstone Gardens CT1021001 | 79 | 0 | 0 | 4 | 2.3 ppb |
| Thompson Hill Water Co - Beechwood Acres CT0867071 | 77 | 0 | 0 | 2 | 0.7 ppb |
| Ashland Pond Mobile Home Park CT0580061 | 74 | 0 | 0 | 1 | 2 ppb |
| Lakeside Manor Apartments CT0860091 | 72 | 0 | 0 | 2 | 1.3 ppb |
| Round Hill LLC - Well# 1&2 CT0731021 | 72 | 0 | 0 | 1 | 2.8 ppb |
ZIP reports in New London County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 06350, 06439.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.