Water quality in Norwalk, Connecticut
Norwalk is in Fairfield County. 336 active public water systems serve the county; 249 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Fairfield County
60 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Norwalk First Taxing District New Canaan, Norwalk, Westport and 1 more |
40,256 | 0 | 0.7 mi | |
| Aquarion-Darien Darien, New Canaan, Norwalk and 1 more |
18,737 | 0 | 2.5 mi | |
| Aquarion-Stamford Darien, Greenwich, Stamford |
119,214 | 0 | 6.2 mi | |
| Aquarion-Eastern Fairfield County Beacon Falls, Bridgeport, Darien and 17 more |
351,756 | 2 | 6.4 mi | |
| Aquarion-New Canaan New Canaan, Stamford |
10,097 | 0 | 8.4 mi | |
| Weston Water Supply Weston |
100 | 1 | 8.5 mi | |
| Aquarion-Ridgefield Ridgefield |
7,476 | 1 | 11.9 mi | |
| Brookview Water Company Ridgefield |
55 | 4 | 14.5 mi | |
| Tashua Village Association, Inc. Trumbull |
35 | 6 | 14.7 mi | |
| Brunswick School (lower & Lower Middle) Greenwich |
567 | 0 | 14.8 mi | |
| Aquarion-Ridgefield Knolls Ridgefield |
958 | 1 | 15.1 mi | |
| Lake Waubeeka Association Danbury |
712 | 0 | 15.6 mi | |
| Aquarion-Scodon Ridgefield |
130 | 0 | 16.6 mi | |
| Shady Acres Mobile Home Park Danbury |
117 | 1 | 16.8 mi | |
| Bethel Water Dept Bethel, Danbury |
9,507 | 6 | 16.8 mi | |
| Elmwood Court, LLC Bethel |
54 | 6 | 17.7 mi | |
| Aquarion-McKeon Ridgefield |
67 | 0 | 18.0 mi | |
| Aquarion-Barnum Ridgefield |
120 | 0 | 18.0 mi | |
| 27 Maple Drive Monroe |
38 | 3 | 18.1 mi | |
| Aquarion-Ken Oaks Danbury |
152 | 0 | 18.2 mi | |
| Aquarion-Rolling Ridge Danbury |
115 | 0 | 18.6 mi | |
| Aquarion-Newtown Regional Newtown |
6,054 | 1 | 19.0 mi | |
| Danbury Water Department Bethel, Brookfield, Danbury and 1 more |
62,055 | 0 | 19.0 mi | |
| 55 Sugar Street Newtown |
158 | 5 | 19.7 mi | |
| Stone Bridge Center for Health & Rehab Newtown |
504 | 2 | 19.8 mi |
Non-community systems in Fairfield County (275: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Fairfield County, nearest to Norwalk first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files or the centre of the first town EPA lists the system as serving, from Census Bureau county subdivision files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Connecticut records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.