Water quality in Guilford, Connecticut
Guilford is in New Haven County. 212 active public water systems serve the county; 114 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in New Haven County
31 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Quonnipaug Hills Main System Guilford |
564 | 2 | 3.1 mi | |
| Ctwc Legend Hill System Madison |
1,368 | 0 | 3.6 mi | |
| Northford Glen Condominium Association North Branford |
84 | 5 | 4.9 mi | |
| Blue Trails Water Association Durham, North Branford |
224 | 4 | 5.1 mi | |
| Ctwc Green Springs System Madison |
104 | 1 | 5.3 mi | |
| Ctwc Shoreline Region-Guilford System Clinton, Guilford, Madison and 2 more |
33,975 | 0 | 9.2 mi | |
| Wallingford Water Department North Haven, Wallingford |
37,267 | 2 | 9.6 mi | |
| Regional Water Authority Ansonia, Bethany, Branford and 17 more |
418,900 | 0 | 12.4 mi | |
| Meriden Water Division Berlin, Cheshire, Meriden and 2 more |
58,441 | 4 | 13.3 mi | |
| Crestview Condominium Association Cheshire |
84 | 6 | 13.3 mi | |
| Meriden Care Center Llc-Silver Springs Meriden |
334 | 0 | 13.5 mi | |
| Harmony Acres Mobile Home Park Prospect |
465 | 1 | 15.9 mi | |
| Bethany Mobile Home Park Bethany |
138 | 2 | 17.1 mi | |
| Aquarion-East Derby Derby, Orange |
1,101 | 1 | 18.8 mi | |
| Aquarion-Valley Ansonia, Beacon Falls, Bethany and 3 more |
13,080 | 0 | 19.8 mi | |
| Ctwc Naugatuck Region-Central System Beacon Falls, Naugatuck, Prospect and 1 more |
22,735 | 0 | 20.6 mi | |
| Aquarion-Clearview Hills Wolcott |
215 | 0 | 21.8 mi | |
| Wolcott Water Department Waterbury, Wolcott |
2,550 | 0 | 21.9 mi | |
| Countryside Apartments Wolcott |
218 | 0 | 21.9 mi | |
| Waterbury Water Department Middlebury, Prospect, Waterbury and 2 more |
107,271 | 2 | 22.4 mi | |
| Aquarion-Woodrich Village Wolcott |
72 | 0 | 22.9 mi | |
| Idleview Mobile Home Park Naugatuck |
138 | 0 | 23.1 mi | |
| Aquarion-Hawkstone Oxford, Seymour |
120 | 0 | 23.4 mi | |
| Arrowhead by the Lake Association, Inc. Wolcott |
288 | 0 | 23.6 mi | |
| Aquarion-Oxford Towne Center Oxford |
449 | 0 | 24.2 mi |
Non-community systems in New Haven County (180: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to New Haven County, nearest to Guilford 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 county subdivision files or the centre of the first town EPA lists the system as serving, from Census Bureau place 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.