Water quality in Southold, New York
Southold 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 |
|---|---|---|---|---|
| West Neck Water District Shelter Island (t) |
100 | 0 | 2.9 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 3.0 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 3.3 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 6.7 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 10.4 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 12.5 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 15.4 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 17.9 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 18.4 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 19.1 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 19.7 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 25.6 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 28.3 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 33.7 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 41.4 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 45.2 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 49.5 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 50.9 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 51.7 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 53.0 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 54.3 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 55.2 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 55.9 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 56.2 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 62.2 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 |
|---|---|---|---|---|
|
Pridwin Hotel Shelter Island (t) |
100 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Eccentric Bagel Shelter Island (t) |
50 | 0 | 0 | |
|
Bridge Street Water Shelter Island (t) |
75 | 0 | 0 | |
|
Dering Harbor Corp Shelter Island (t) |
250 | 0 | 0 | |
|
Opties and Dinghies Shelter Island (t) |
50 | 0 | 0 | |
|
Sylvester Manor |
100 | 0 | 0 | |
|
Marias Kitchen Shelter Island (t) |
25 | 0 | 0 | |
|
Shelter Island Library |
258 | 0 | 0 | |
|
American Legion Post #281 Shelter Island (t) |
100 | 0 | 0 | |
|
Shelter Island Town Hall Shelter Island (t) |
50 | 0 | 0 | |
|
Cards Cottages Shelter Island (t) |
60 | 0 | 0 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
Shelter Island Nutrition Program Shelter Island (t) |
75 | 0 | 0 | |
|
Shelter Island School Shelter Island (t) |
315 | 1 | 0 | |
|
Island Boatyard & Marina Shelter Island (t) |
100 | 0 | 0 | |
|
Kyles (previously Cafe 27) Shelter Island (t) |
150 | 0 | 0 | |
|
South Harbor Park Southold (t) |
50 | 0 | 0 | |
|
All Seasons Catering Shelter Island (t) |
50 | 0 | 0 | |
|
Gardiners Bay Country Club Shelter Island (t) |
100 | 0 | 0 | |
|
Wades Beach Shelter Island (t) |
75 | 0 | 0 | |
|
Ellis Country Market Shelter Island (t) |
50 | 0 | 0 | |
|
Vine Street Cafe Shelter Island (t) |
80 | 0 | 0 | |
|
Shelter Island Senior Citizens Center Shelter Island (t) |
35 | 0 | 0 | |
|
Coecles Harbor Marina Shelter Island (t) |
150 | 0 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
Mashomack Pres. Visitor Ctr. Shelter Island (t) |
50 | 0 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Rams Head Inn Shelter Island (t) |
50 | 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 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Orient Yacht Club Southold (t) |
50 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Moonflower Southold (t) |
50 | 1 | 0 | |
|
Orient Country Store Southold (t) |
100 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
Orient Beach State Park Southold (t) |
800 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
Camp Quinipet Shelter Island (t) |
150 | 0 | 0 | |
|
Sag Harbor State Golf Course Southampton (t) |
200 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Orient by the Sea Southold (t) |
100 | 0 | 0 | |
|
Cross Sound Ferry Southold (t) |
100 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Southold 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.