County · Connecticut
Fairfield County, Connecticut: drinking water records
This overview covers 46 ZIP codes and 63 community water systems in Fairfield County. It also stands in for 1 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 |
|---|---|---|---|---|---|
| Danbury Water Department CT0340011 | 62,055 | 240 | 4 | 1 | 0 ppb |
| South Norwalk Electric & Water CT1030021 | 42,000 | 120 | 0 | 3 | 2 ppb |
| Aquarion-Eastern Fairfield County CT0150011 | 351,756 | 420 | 7 | 0 | 1.7 ppb |
| Aquarion-Stamford CT1350011 | 119,214 | 240 | 3 | 0 | 0 ppb |
| Aquarion-Greenwich CT0570011 | 53,297 | 360 | 4 | 0 | 2.2 ppb |
| Norwalk First Taxing District CT1030011 | 40,256 | 180 | 6 | 0 | 3 ppb |
| Aquarion-Darien CT0350011 | 18,737 | 240 | 4 | 0 | 2 ppb |
| Aquarion-New Milford Regional CT0960011 | 13,331 | 300 | 5 | 0 | 2 ppb |
| Aquarion-New Canaan CT0900011 | 10,097 | 120 | 3 | 0 | 0 ppb |
| Bethel Water Dept CT0090011 | 9,507 | 60 | 3 | 0 | 1.4 ppb |
| Aquarion-Ridgefield CT1180011 | 7,476 | 300 | 7 | 0 | 3.1 ppb |
| Aquarion-Newtown Regional CT0970011 | 6,054 | 120 | 8 | 0 | 4 ppb |
| Fairfield Hills CT0970021 | 2,610 | 0 | 0 | 1 | 4 ppb |
| Stone Bridge Center for Health & Rehab CT0971011 | 504 | 0 | 0 | 1 | 1.3 ppb |
| Knollcrest Tax District CT0910081 | 356 | 0 | 0 | 3 | 0 ppb |
| 55 Sugar Street CT0970071 | 158 | 0 | 0 | 1 | 0.9 ppb |
| Brookfield Hills Condominium Unit Owners CT0180171 | 144 | 0 | 0 | 4 | 0.8 ppb |
| Aquarion-Pearce Manor CT0340081 | 133 | 0 | 0 | 1 | 1 ppb |
| Lake Lillinonah Shores Condos CT0180231 | 130 | 0 | 0 | 7 | 4.5 ppb |
| Cornell Hills Assoc, INC CT0340181 | 108 | 0 | 0 | 1 | 0 ppb |
| Weston Water Supply CT1570011 | 100 | 0 | 0 | 2 | 0 ppb |
| Woodcreek Village Condominium Assn, INC CT0180201 | 72 | 0 | 0 | 1 | 2 ppb |
| Cedar Terrace Prop Owners Assn CT0340141 | 66 | 0 | 0 | 3 | 1.1 ppb |
| Abenaki Water/Tioga Belmont NH0202030 | 55 | 0 | 0 | 1 | 34 ppb |
| Brookview Water Company CT1180091 | 55 | 0 | 0 | 1 | 3.4 ppb |
ZIP reports in Fairfield 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: 06896.
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.