Water quality in East Dennis, Massachusetts
East Dennis is in Barnstable County. 124 active public water systems serve the county; 30 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 Barnstable County
29 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Brewster Water Department Brewster |
35,000 | 2 | 4.7 mi | |
| Yarmouth Water Department Yarmouth |
38,900 | 1 | 5.1 mi | |
| Harwich Water Department Harwich |
39,144 | 0 | 5.6 mi | |
| Barnstable Fire District Barnstable |
5,400 | 0 | 7.8 mi | |
| Hyannis Water System, Town of Barnstable Barnstable |
35,000 | 1 | 9.2 mi | |
| Chatham Water Department Chatham |
30,000 | 0 | 9.4 mi | |
| Orleans Water Department Orleans |
17,460 | 1 | 9.6 mi | |
| Town of Eastham Eastham |
6,199 | 0 | 11.4 mi | |
| Centerville Osterville Marstons Mills WD Barnstable |
50,000 | 2 | 13.0 mi | |
| Massasoit Hills Trailer Park Wellfleet |
120 | 1 | 13.0 mi | |
| Pleasant Water Wellfleet |
200 | 1 | 14.5 mi | |
| Harborside Village Wellfleet |
165 | 0 | 15.0 mi | |
| Wellfleet Apartments Wellfleet |
48 | 1 | 15.3 mi | |
| Wellfleet Municipal Water System Wellfleet |
750 | 1 | 15.6 mi | |
| Cotuit Fire District Water Department Barnstable |
4,938 | 0 | 16.4 mi | |
| Beechwood Point Condos Mashpee |
112 | 1 | 16.5 mi | |
| Sandwich Water District Sandwich |
23,000 | 1 | 16.6 mi | |
| Sea Oaks Condominiums Mashpee |
222 | 0 | 17.6 mi | |
| Upper Cape Regional Water Cooperative Sandwich |
56,250 | 0 | 17.6 mi | |
| Mashpee Water District Mashpee |
36,922 | 0 | 18.9 mi | |
| Otis Air National Guard Base Falmouth |
6,000 | 2 | 19.2 mi | |
| Stones Throw Condos Truro |
80 | 0 | 19.8 mi | |
| North Sagamore Water District Bourne |
4,668 | 0 | 19.9 mi | |
| Schooner Pass Trustees Condominiums Bourne |
136 | 0 | 21.6 mi | |
| Provincetown Water Department Provincetown |
22,250 | 0 | 21.6 mi |
Non-community systems in Barnstable County (94: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Barnstable County, nearest to East Dennis 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.