Water quality in Derby, Connecticut
Derby 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
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in New Haven County
31 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Aquarion-East Derby Derby, Orange |
1,101 | 1 | 2.0 mi | |
| Aquarion-Valley Ansonia, Beacon Falls, Bethany and 3 more |
13,080 | 0 | 6.4 mi | |
| Aquarion-Hawkstone Oxford, Seymour |
120 | 0 | 7.5 mi | |
| Bethany Mobile Home Park Bethany |
138 | 2 | 9.8 mi | |
| Aquarion-Oxford Towne Center Oxford |
449 | 0 | 10.9 mi | |
| Harmony Acres Mobile Home Park Prospect |
465 | 1 | 11.3 mi | |
| Ctwc Naugatuck Region-Central System Beacon Falls, Naugatuck, Prospect and 1 more |
22,735 | 0 | 12.5 mi | |
| Crestview Condominium Association Cheshire |
84 | 6 | 12.9 mi | |
| Idleview Mobile Home Park Naugatuck |
138 | 0 | 13.5 mi | |
| Aquarion-Lakeside Southbury |
455 | 0 | 13.5 mi | |
| Heritage Water Company Middlebury, Oxford, Southbury |
7,300 | 0 | 13.6 mi | |
| Wallingford Water Department North Haven, Wallingford |
37,267 | 2 | 14.2 mi | |
| Northford Glen Condominium Association North Branford |
84 | 5 | 14.8 mi | |
| Oakdale Manor Water Association Southbury |
40 | 5 | 14.9 mi | |
| Middlebury Commons Middlebury |
76 | 1 | 15.4 mi | |
| Aquarion-West Shore Middlebury |
100 | 0 | 16.2 mi | |
| Blue Trails Water Association Durham, North Branford |
224 | 4 | 16.3 mi | |
| Waterbury Water Department Middlebury, Prospect, Waterbury and 2 more |
107,271 | 2 | 16.4 mi | |
| Quonnipaug Hills Section I Guilford |
27 | 0 | 17.5 mi | |
| Southbury Training School Southbury |
816 | 4 | 17.6 mi | |
| Quonnipaug Hills Main System Guilford |
564 | 2 | 17.6 mi | |
| Wolcott Water Department Waterbury, Wolcott |
2,550 | 0 | 17.8 mi | |
| Aquarion-Clearview Hills Wolcott |
215 | 0 | 18.3 mi | |
| Countryside Apartments Wolcott |
218 | 0 | 18.4 mi | |
| Meriden Water Division Berlin, Cheshire, Meriden and 2 more |
58,441 | 4 | 18.5 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 Derby 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.