Water quality for ZIP code 11777
ZIP 11777 covers Port Jefferson, Belle Terre, East Setauket, Mount Sinai, and Port Jefferson Station in Suffolk County, New York, one of 108 ZIP codes in the 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 | 6.6 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 10.0 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 12.0 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 14.6 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 14.9 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 16.2 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 18.1 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 18.3 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 18.6 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 18.9 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 20.6 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 20.9 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 21.6 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 21.8 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 21.9 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 22.6 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 25.4 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 28.9 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 30.0 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 38.2 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 38.4 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 38.8 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 41.9 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 45.6 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 46.8 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 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
Shell Station Yaphank |
100 | 1 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 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 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
Eastport Animal Hospital Brookhaven (t) |
50 | 0 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
94 Montauk Highway |
25 | 0 | 0 | |
|
78 Montauk Highway LLC (previouslypiffe) |
100 | 0 | 0 | |
|
Ighl, East Moriches Brookhaven (t) |
50 | 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 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
Gilgo Beach 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 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
South Harbor Park Southold (t) |
50 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 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 | |
|
Eccentric Bagel Shelter Island (t) |
50 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.