Water quality in Sag Harbor, New York
Sag Harbor is in Suffolk County. 146 active public water systems serve the county; 25 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 Suffolk County
25 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 5.5 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 5.7 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 6.2 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 6.2 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 8.8 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 10.0 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 14.8 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 20.2 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 21.0 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 22.6 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 22.6 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 28.4 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 31.3 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 35.7 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 45.6 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 49.5 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 51.4 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 53.0 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 56.0 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 56.8 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 58.1 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 58.1 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 58.9 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 60.2 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 64.7 mi |
Non-community systems in Suffolk County (120: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sag Harbor State Golf Course Southampton (t) |
200 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Wolffer Estate Vineyard Southampton (t) |
50 | 0 | 0 | |
|
Old Stove Pub Southampton (t) |
150 | 1 | 0 | |
|
LA Capannina Southampton (t) |
100 | 0 | 0 | |
|
Wolffer Estates Stables Southampton (t) |
45 | 1 | 0 | |
|
Speedway #7794 (fna Hess General Store) East Hampton (t) |
200 | 0 | 0 | |
|
Camp Quinipet Shelter Island (t) |
150 | 0 | 0 | |
|
Whales Tale Shelter Island (t) |
150 | 0 | 0 | |
|
Perlman Music School Shelter Island (t) |
80 | 0 | 0 | |
|
Islander(pat & Steves Family Restaurant Shelter Island (t) |
75 | 0 | 0 | |
|
Shelter Island Slice Shelter Island (t) |
60 | 1 | 0 | |
|
Commander Cody Seafood Shelter Island (t) |
50 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Buckskill Tennis Club East Hampton (v) |
60 | 0 | 0 | |
|
Wades Beach Shelter Island (t) |
75 | 0 | 0 | |
|
Mashomack Pres. Visitor Ctr. Shelter Island (t) |
50 | 0 | 0 | |
|
Long House Reserve East Hampton (t) |
50 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Island Boatyard & Marina Shelter Island (t) |
100 | 0 | 0 | |
|
Shelter Island Senior Citizens Center Shelter Island (t) |
35 | 0 | 0 | |
|
Vine Street Cafe Shelter Island (t) |
80 | 0 | 0 | |
|
Ellis Country Market Shelter Island (t) |
50 | 0 | 0 | |
|
Townline Bbq East Hampton (t) |
150 | 0 | 0 | |
|
All Seasons Catering Shelter Island (t) |
50 | 0 | 0 | |
|
Kyles (previously Cafe 27) Shelter Island (t) |
150 | 0 | 0 | |
|
Shelter Island School Shelter Island (t) |
315 | 1 | 0 | |
|
Shelter Island Nutrition Program Shelter Island (t) |
75 | 0 | 0 | |
|
American Legion Post #281 Shelter Island (t) |
100 | 0 | 0 | |
|
Swans Marina East Hampton (v) |
200 | 0 | 0 | |
|
Maidstone Market East Hampton (t) |
100 | 0 | 0 | |
|
Shelter Island Town Hall Shelter Island (t) |
50 | 0 | 0 | |
|
Shelter Island Library |
258 | 0 | 0 | |
|
Rams Head Inn Shelter Island (t) |
50 | 0 | 0 | |
|
Marias Kitchen Shelter Island (t) |
25 | 0 | 0 | |
|
Fresh Pond Road Park & Beach East Hampton (v) |
100 | 0 | 0 | |
|
Fort Pond House East Hampton (t) |
50 | 0 | 0 | |
|
South Lake Drive Park East Hampton (t) |
50 | 0 | 0 | |
|
Barcelona Bungalows East Hampton (v) |
36 | 0 | 0 | |
|
Cards Cottages Shelter Island (t) |
60 | 0 | 0 | |
|
Coecles Harbor Marina Shelter Island (t) |
150 | 0 | 0 | |
|
East Hampton Point East Hampton (v) |
100 | 1 | 1 | |
|
Opties and Dinghies Shelter Island (t) |
50 | 0 | 0 | |
|
Maidstone Harbor Marina East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Park Beach/ballfield East Hampton (t) |
100 | 0 | 0 | |
|
Alberts Landing East Hampton (t) |
75 | 0 | 0 | |
|
Maidstone Gun Club East Hampton (t) |
100 | 0 | 0 | |
|
Sylvester Manor |
100 | 0 | 0 | |
|
Eccentric Bagel Shelter Island (t) |
50 | 0 | 0 | |
|
Rita Cantina East Hampton (t) |
70 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Sag Harbor 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 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 New York 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.