Water quality in Nissequogue, New York
Nissequogue 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 |
|---|---|---|---|---|
| ST James Water District Smithtown (t) |
10,587 | 0 | 2.2 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 2.8 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 9.0 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 10.9 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 11.6 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 13.6 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 16.2 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 16.9 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 17.0 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 17.0 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 17.8 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 19.7 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 19.8 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 23.4 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 24.6 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 24.9 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 26.7 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 27.6 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 34.6 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 45.3 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 45.3 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 45.7 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 49.0 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 52.4 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 53.4 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 |
|---|---|---|---|---|
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
555 Professional Bldg. Brookhaven (t) |
30 | 0 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
Shell Station Yaphank |
100 | 1 | 0 | |
|
North Shore Office Building Brookhaven (t) |
50 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
1983 Montauk Hwy Offices Coparts Brookhaven (t) |
190 | 0 | 0 | |
|
Varneys Restaurant Brookhaven (t) |
48 | 0 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
Exxon (fna Hess Mart Calverton) Brookhaven (t) |
100 | 0 | 0 | |
|
Silly Lilly Fishing Station Brookhaven (t) |
100 | 0 | 0 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
Long Island Game Farm Brookhaven (t) |
200 | 0 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
Gilgo Beach Babylon (t) |
500 | 0 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
94 Montauk Highway |
25 | 0 | 0 | |
|
78 Montauk Highway LLC (previouslypiffe) |
100 | 0 | 0 | |
|
Ighl, East Moriches Brookhaven (t) |
50 | 0 | 0 | |
|
Eastport Animal Hospital Brookhaven (t) |
50 | 0 | 0 | |
|
Coastal Pipeline Corp. Riverhead (t) |
30 | 0 | 0 | |
|
Hampton Hills Golf Club Southampton (t) |
150 | 0 | 0 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
Sea Haven Resort Motel (fna Sun+sand) Southampton (v) |
50 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
South Harbor Park Southold (t) |
50 | 0 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Pridwin Hotel Shelter Island (t) |
100 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Nissequogue 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.