New York
Suffolk County drinking water quality
146 active public water systems serve 1,387,702 people in Suffolk County. 121 are compliant, 25 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Active systems
146
26 community systems
People served
1.4M
by public water systems
Systems with violations
25
17% of active systems, past 3 years
Serious violators
0
0 systems carry a health flag
Community water systems
26 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Suffolk County Water Authority Babylon (t), Brookhaven (t), East Hampton (t) and 6 more |
1,100,000 | 0 | 0 | |
|
South Huntington Water District Huntington (t) |
81,760 | 1 | 0 | |
|
Greenlawn Water District Huntington (t) |
42,000 | 3 | 0 | |
|
Riverhead Water District Riverhead (t) |
35,000 | 1 | 0 | |
|
Dix Hills Water District Huntington (t) |
34,522 | 1 | 0 | |
|
Smithtown Water District Smithtown (t) |
19,635 | 0 | 0 | |
|
Hampton Bays Water District Southampton (t) |
12,500 | 0 | 0 | |
|
Robert Moses State Park Babylon (t) |
11,600 | 0 | 0 | |
|
ST James Water District Smithtown (t) |
10,587 | 0 | 0 | |
|
Ocean Beach Water District Islip (t) |
4,500 | 0 | 0 | |
|
Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 0 | |
|
Northport VA Hospital Huntington (t) |
3,088 | 1 | 0 | |
|
Greenport Water District Southold (t) |
2,050 | 1 | 0 | |
|
Riverside Water District Southampton (v) |
2,050 | 0 | 0 | |
|
Saltaire Water District Islip (t) |
2,000 | 0 | 0 | |
|
Seaview Water Company Brookhaven (t) |
1,400 | 0 | 0 | |
|
Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 1 | |
|
Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 0 | |
|
Fishers Island Water Works Southold (t) |
380 | 1 | 1 | |
|
West Gilgo Beach Association Babylon (t) |
300 | 0 | 0 | |
|
West Neck Water District Shelter Island (t) |
100 | 0 | 0 | |
|
Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 0 | |
|
Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 0 | |
|
Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 0 | |
|
Maidstone Park Cottages East Hampton (v) |
34 | 2 | 0 | |
|
Dering Harbor Water District Shelter Island (t) |
14 | 0 | 0 |
Non-community systems (120: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
Orient Beach State Park Southold (t) |
800 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Gilgo Beach Babylon (t) |
500 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Shelter Island School Shelter Island (t) |
315 | 1 | 0 | |
|
Shelter Island Library |
258 | 0 | 0 | |
|
Dering Harbor Corp Shelter Island (t) |
250 | 0 | 0 | |
|
Atlantic Bluffs Club East Hampton (t) |
200 | 0 | 0 | |
|
Camp Blue Bay East Hampton (v) |
200 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
Long Island Game Farm Brookhaven (t) |
200 | 0 | 0 | |
|
Sag Harbor State Golf Course Southampton (t) |
200 | 0 | 0 | |
|
Speedway #7794 (fna Hess General Store) East Hampton (t) |
200 | 0 | 0 | |
|
Swans Marina East Hampton (v) |
200 | 0 | 0 | |
|
1983 Montauk Hwy Offices Coparts Brookhaven (t) |
190 | 0 | 0 | |
|
Camp Quinipet Shelter Island (t) |
150 | 0 | 0 | |
|
Coecles Harbor Marina Shelter Island (t) |
150 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
Hampton Hills Golf Club Southampton (t) |
150 | 0 | 0 | |
|
Kyles (previously Cafe 27) Shelter Island (t) |
150 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Old Stove Pub Southampton (t) |
150 | 1 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
Townline Bbq East Hampton (t) |
150 | 0 | 0 | |
|
Whales Tale Shelter Island (t) |
150 | 0 | 0 | |
|
Plum Island Animal Disease Lab Southold (t) |
130 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
Old Stone Market Brookhaven (t) |
125 | 0 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
78 Montauk Highway LLC (previouslypiffe) |
100 | 0 | 0 | |
|
American Legion Post #281 Shelter Island (t) |
100 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
Cross Sound Ferry Southold (t) |
100 | 0 | 0 | |
|
East Hampton Point East Hampton (v) |
100 | 1 | 1 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Exxon (fna Hess Mart Calverton) Brookhaven (t) |
100 | 0 | 0 | |
|
Fresh Pond Road Park & Beach East Hampton (v) |
100 | 0 | 0 | |
|
Gardiners Bay Country Club Shelter Island (t) |
100 | 0 | 0 | |
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
Island Boatyard & Marina Shelter Island (t) |
100 | 0 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
LA Capannina Southampton (t) |
100 | 0 | 0 | |
|
Maidstone Gun Club East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Harbor Marina East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Market East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Park Beach/ballfield East Hampton (t) |
100 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Montauk Lighthouse Reception Center East Hampton (t) |
100 | 0 | 0 | |
|
Montauk State Park East Hampton (t) |
100 | 0 | 0 | |
|
Montauket Hotel East Hampton (t) |
100 | 0 | 0 | |
|
Orient by the Sea Southold (t) |
100 | 0 | 0 | |
|
Orient Country Store Southold (t) |
100 | 0 | 0 | |
|
Pridwin Hotel Shelter Island (t) |
100 | 0 | 0 | |
|
Shell Station Yaphank |
100 | 1 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Silly Lilly Fishing Station Brookhaven (t) |
100 | 0 | 0 | |
|
Surfside Inn East Hampton (t) |
100 | 0 | 0 | |
|
Sylvester Manor |
100 | 0 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
Perlman Music School Shelter Island (t) |
80 | 0 | 0 | |
|
Vine Street Cafe Shelter Island (t) |
80 | 0 | 0 | |
|
Alberts Landing East Hampton (t) |
75 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
Bridge Street Water Shelter Island (t) |
75 | 0 | 0 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
Islander(pat & Steves Family Restaurant Shelter Island (t) |
75 | 0 | 0 | |
|
Shelter Island Nutrition Program Shelter Island (t) |
75 | 0 | 0 | |
|
Wades Beach Shelter Island (t) |
75 | 0 | 0 | |
|
Rita Cantina East Hampton (t) |
70 | 0 | 0 | |
|
Buckskill Tennis Club East Hampton (v) |
60 | 0 | 0 | |
|
Cards Cottages Shelter Island (t) |
60 | 0 | 0 | |
|
Shelter Island Slice Shelter Island (t) |
60 | 1 | 0 | |
|
All Seasons Catering Shelter Island (t) |
50 | 0 | 0 | |
|
Amagansett Laundry East Hampton (t) |
50 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
Commander Cody Seafood Shelter Island (t) |
50 | 0 | 0 | |
|
East End Disabilities |
50 | 0 | 0 | |
|
Eastport Animal Hospital Brookhaven (t) |
50 | 0 | 0 | |
|
Eccentric Bagel Shelter Island (t) |
50 | 0 | 0 | |
|
Ellis Country Market Shelter Island (t) |
50 | 0 | 0 | |
|
Fort Pond House East Hampton (t) |
50 | 0 | 0 | |
|
Ighl, East Moriches Brookhaven (t) |
50 | 0 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
Long House Reserve East Hampton (t) |
50 | 0 | 0 | |
|
Mashomack Pres. Visitor Ctr. Shelter Island (t) |
50 | 0 | 0 | |
|
Moonflower Southold (t) |
50 | 1 | 0 | |
|
North Shore Office Building Brookhaven (t) |
50 | 0 | 0 | |
|
Opties and Dinghies Shelter Island (t) |
50 | 0 | 0 | |
|
Orient Yacht Club Southold (t) |
50 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Rams Head Inn Shelter Island (t) |
50 | 0 | 0 |
Inactive systems (451, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.