Water quality in Mount Sinai, New York
Mount Sinai 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 | 7.8 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 9.4 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 11.6 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 12.0 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 12.8 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 15.8 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 16.3 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 18.1 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 18.1 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 19.1 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 19.6 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 20.6 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 21.6 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 21.8 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 22.6 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 23.4 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 25.8 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 26.3 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 30.9 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 36.2 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 36.2 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 36.7 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 39.9 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 43.4 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 44.5 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 |
|---|---|---|---|---|
|
555 Professional Bldg. Brookhaven (t) |
30 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
North Shore Office Building Brookhaven (t) |
50 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
Shell Station Yaphank |
100 | 1 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
1983 Montauk Hwy Offices Coparts Brookhaven (t) |
190 | 0 | 0 | |
|
Varneys Restaurant Brookhaven (t) |
48 | 0 | 0 | |
|
Exxon (fna Hess Mart Calverton) Brookhaven (t) |
100 | 0 | 0 | |
|
Silly Lilly Fishing Station Brookhaven (t) |
100 | 0 | 0 | |
|
Long Island Game Farm Brookhaven (t) |
200 | 0 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
Coastal Pipeline Corp. Riverhead (t) |
30 | 0 | 0 | |
|
Eastport Animal Hospital Brookhaven (t) |
50 | 0 | 0 | |
|
94 Montauk Highway |
25 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
78 Montauk Highway LLC (previouslypiffe) |
100 | 0 | 0 | |
|
Ighl, East Moriches Brookhaven (t) |
50 | 0 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
Hampton Hills Golf Club Southampton (t) |
150 | 0 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Sea Haven Resort Motel (fna Sun+sand) Southampton (v) |
50 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
Gilgo Beach Babylon (t) |
500 | 0 | 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 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Mount Sinai 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.