Water quality in Ayer, Massachusetts
Ayer is in Middlesex County. 206 active public water systems serve the county; 85 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 Middlesex County
97 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Devens Massdevelopment Ayer |
6,500 | 0 | 1.2 mi | |
| Shirley Water District Shirley |
4,165 | 4 | 2.8 mi | |
| McI Shirley Shirley |
3,500 | 0 | 3.4 mi | |
| Groton Water Department Groton |
5,017 | 0 | 4.1 mi | |
| Woodland Ridge Shirley |
125 | 0 | 4.2 mi | |
| The Village at Shepley Hill Groton |
52 | 0 | 4.4 mi | |
| Harvard Ridge Condominium Boxborough |
350 | 1 | 4.7 mi | |
| Brook Village Condominium Boxborough |
400 | 0 | 4.7 mi | |
| West Groton Water Supply District Groton |
1,853 | 0 | 4.9 mi | |
| Paddock Estates Boxborough |
463 | 1 | 5.1 mi | |
| Codman Hill Condominium Boxborough |
360 | 0 | 5.3 mi | |
| Littleton Water Department Littleton |
9,334 | 1 | 5.5 mi | |
| Enclave at Boxborough Boxborough |
100 | 1 | 5.8 mi | |
| Carriage House Condominium Boxborough |
68 | 0 | 6.2 mi | |
| Haystack Estates Westford |
60 | 0 | 6.3 mi | |
| Centre Village Apartments Boxborough |
36 | 1 | 6.3 mi | |
| Liberty House Condominium Boxborough |
80 | 0 | 6.9 mi | |
| Still Meadow Village Condominiums Groton |
50 | 0 | 6.9 mi | |
| Applewood Community Corporation Boxborough |
500 | 0 | 7.2 mi | |
| Regency at Stow Condominiums Stow |
132 | 1 | 7.9 mi | |
| Westford Water Department Westford |
18,848 | 1 | 8.0 mi | |
| Pepperell Dpw Water Division Pepperell |
9,217 | 0 | 8.1 mi | |
| Villages at Stow Stow |
300 | 0 | 8.7 mi | |
| Masters Academy International Stow |
225 | 4 | 8.8 mi | |
| Pilot Grove Apartments II Stow |
134 | 1 | 8.9 mi |
Non-community systems in Middlesex County (108: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Middlesex County, nearest to Ayer 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 Massachusetts 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.