County · Connecticut
New Haven County, Connecticut: drinking water records
This overview covers 41 ZIP codes and 32 community water systems in New Haven County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Meriden Water Division CT0800011 | 58,441 | 566 | 7 | 1 | 0 ppb |
| Regional Water Authority CT0930011 | 418,900 | 900 | 4 | 0 | 0 ppb |
| Waterbury Water Department CT1510011 | 107,271 | 120 | 0 | 0 | 4 ppb |
| Wallingford Water Department CT1480011 | 37,267 | 240 | 3 | 0 | 0 ppb |
| Ctwc - Shoreline Region-Guilford System CT0608011 | 33,975 | 660 | 7 | 0 | 0 ppb |
| Ctwc - Naugatuck Region-Central System CT0880011 | 22,735 | 120 | 0 | 0 | 0 ppb |
| Aquarion-Valley CT1240011 | 13,080 | 300 | 6 | 0 | 1.1 ppb |
| Heritage Water Company CT1300021 | 7,300 | 120 | 2 | 0 | 0.7 ppb |
| Blue Trails Water Association CT0990011 | 224 | 0 | 0 | 2 | 2.4 ppb |
| Lindhbrook Water Company RI1000098 | 200 | 0 | 0 | 4 | 2.8 ppb |
| Crestview Condominium Association CT0251021 | 84 | 0 | 0 | 1 | 0 ppb |
| Northford Glen Condominium Association CT0990031 | 84 | 0 | 0 | 2 | 0 ppb |
| Aquarion-Woodrich Village CT1666011 | 72 | 60 | 5 | 0 | 1.6 ppb |
| Oakdale Manor Water Association CT1300071 | 40 | 0 | 0 | 3 | 0 ppb |
| Wolcott Water Department CT1661423 | 2,550 | 0 | 0 | 0 | 0 ppb |
| Ctwc - Legend Hill System CT0765101 | 1,368 | 0 | 0 | 0 | 0 ppb |
| Aquarion-East Derby CT0378011 | 1,101 | 0 | 0 | 0 | 0 ppb |
| Southbury Training School CT1300011 | 816 | 0 | 0 | 0 | 1.8 ppb |
| Quonnipaug Hills - Main System CT0600041 | 564 | 0 | 0 | 0 | 2.8 ppb |
| Harmony Acres Mobile Home Park CT1150031 | 465 | 0 | 0 | 0 | 1.4 ppb |
| Aquarion-Lakeside CT1300031 | 455 | 0 | 0 | 0 | 0 ppb |
| Aquarion-Oxford Towne Center CT1085061 | 449 | 0 | 0 | 0 | 0 ppb |
| Arrowhead By the Lake Association, INC. CT1669011 | 288 | 0 | 0 | 0 | 1 ppb |
| Aquarion-Clearview Hills CT1668011 | 215 | 0 | 0 | 0 | 2.3 ppb |
| Bethany Mobile Home Park CT0081011 | 138 | 0 | 0 | 0 | 0 ppb |
ZIP reports in New Haven County
No ZIP report in this county is published yet.
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.