Water quality in South Dennis, Massachusetts
South 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 |
|---|---|---|---|---|
| Yarmouth Water Department Yarmouth |
38,900 | 1 | 4.0 mi | |
| Harwich Water Department Harwich |
39,144 | 0 | 4.5 mi | |
| Brewster Water Department Brewster |
35,000 | 2 | 5.3 mi | |
| Barnstable Fire District Barnstable |
5,400 | 0 | 7.7 mi | |
| Hyannis Water System, Town of Barnstable Barnstable |
35,000 | 1 | 8.4 mi | |
| Chatham Water Department Chatham |
30,000 | 0 | 8.5 mi | |
| Orleans Water Department Orleans |
17,460 | 1 | 10.2 mi | |
| Centerville Osterville Marstons Mills WD Barnstable |
50,000 | 2 | 12.6 mi | |
| Town of Eastham Eastham |
6,199 | 0 | 12.7 mi | |
| Massasoit Hills Trailer Park Wellfleet |
120 | 1 | 14.5 mi | |
| Cotuit Fire District Water Department Barnstable |
4,938 | 0 | 15.9 mi | |
| Pleasant Water Wellfleet |
200 | 1 | 16.2 mi | |
| Beechwood Point Condos Mashpee |
112 | 1 | 16.3 mi | |
| Harborside Village Wellfleet |
165 | 0 | 16.8 mi | |
| Sandwich Water District Sandwich |
23,000 | 1 | 16.9 mi | |
| Wellfleet Apartments Wellfleet |
48 | 1 | 17.0 mi | |
| Sea Oaks Condominiums Mashpee |
222 | 0 | 17.2 mi | |
| Wellfleet Municipal Water System Wellfleet |
750 | 1 | 17.5 mi | |
| Upper Cape Regional Water Cooperative Sandwich |
56,250 | 0 | 18.3 mi | |
| Mashpee Water District Mashpee |
36,922 | 0 | 18.4 mi | |
| Otis Air National Guard Base Falmouth |
6,000 | 2 | 19.4 mi | |
| North Sagamore Water District Bourne |
4,668 | 0 | 20.8 mi | |
| Barnstable County Jail Bourne |
600 | 1 | 21.8 mi | |
| Stones Throw Condos Truro |
80 | 0 | 21.8 mi | |
| Schooner Pass Trustees Condominiums Bourne |
136 | 0 | 22.1 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 South 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.