Water quality in Stonington, Connecticut
Stonington is in New London County. 392 active public water systems serve the county; 204 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 London County
87 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Aquarion-Arlington Acres Stonington |
392 | 0 | 3.5 mi | |
| Northstone Gardens North Stonington |
79 | 3 | 3.8 mi | |
| Scwa, Cedar Ridge Division North Stonington |
370 | 0 | 3.9 mi | |
| Ctwc Shoreline Region-Masons Island Stonington |
445 | 0 | 4.0 mi | |
| Mystic Village Apartments Groton |
66 | 2 | 4.4 mi | |
| Neighbors of Rogers, LLC Groton |
57 | 4 | 5.0 mi | |
| Scwa, North Stonington Division (nst) North Stonington |
1,860 | 1 | 5.1 mi | |
| Noank Fire District Groton |
1,947 | 2 | 5.2 mi | |
| Ledyard Wpca Ledyard Center Ledyard |
3,294 | 3 | 5.5 mi | |
| Scwa, Chriswood Division (cwd) Ledyard |
164 | 0 | 6.1 mi | |
| Groton Long Point Association Groton |
2,400 | 2 | 6.4 mi | |
| Scwa, Barrett Division (bar) Ledyard |
300 | 0 | 6.8 mi | |
| Groton Utilities Groton, Ledyard |
30,200 | 1 | 7.1 mi | |
| Scwa, Ledyard Center Division Ledyard |
652 | 0 | 7.3 mi | |
| Ash Water Company, LLC Ledyard |
108 | 0 | 8.0 mi | |
| Scwa, Tower-Ferry View Division Ledyard |
2,567 | 1 | 8.8 mi | |
| Preston Plains Water Company Preston |
550 | 2 | 9.3 mi | |
| Ledyard Wpca, Gales Ferry System Groton, Ledyard |
2,369 | 1 | 9.7 mi | |
| New London Dept. of Public Utilities New London, Waterford |
27,620 | 1 | 10.2 mi | |
| Lincoln Park Elderly Housing Preston |
80 | 1 | 10.6 mi | |
| Marina Cove Montville |
70 | 1 | 11.1 mi | |
| Kitemaug Orchard Association, Inc. Montville |
490 | 0 | 11.1 mi | |
| Scwa, Mohegan Division Montville |
1,428 | 0 | 11.8 mi | |
| Mountview Apartments Montville |
105 | 3 | 11.9 mi | |
| Montville Water Supply Montville, Waterford |
1,300 | 0 | 11.9 mi |
Non-community systems in New London County (304: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to New London County, nearest to Stonington 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.