Water quality for ZIP code 11951
ZIP 11951 covers Mastic Beach and Shirley 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 |
|---|---|---|---|---|
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 4.2 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 7.6 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 7.7 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 12.2 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 13.0 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 13.4 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 13.7 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 17.8 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 18.7 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 18.9 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 20.7 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 21.9 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 25.8 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 26.4 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 27.1 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 27.6 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 30.8 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 31.1 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 32.5 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 32.9 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 33.3 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 34.3 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 38.0 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 38.5 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 38.6 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 |
|---|---|---|---|---|
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Exxon (fna Hess Mart Calverton) Brookhaven (t) |
100 | 0 | 0 | |
|
Silly Lilly Fishing Station Brookhaven (t) |
100 | 0 | 0 | |
|
Varneys Restaurant Brookhaven (t) |
48 | 0 | 0 | |
|
1983 Montauk Hwy Offices Coparts Brookhaven (t) |
190 | 0 | 0 | |
|
94 Montauk Highway |
25 | 0 | 0 | |
|
78 Montauk Highway LLC (previouslypiffe) |
100 | 0 | 0 | |
|
Ighl, East Moriches Brookhaven (t) |
50 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
Eastport Animal Hospital Brookhaven (t) |
50 | 0 | 0 | |
|
Long Island Game Farm Brookhaven (t) |
200 | 0 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
Shell Station Yaphank |
100 | 1 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
Hampton Hills Golf Club Southampton (t) |
150 | 0 | 0 | |
|
Coastal Pipeline Corp. Riverhead (t) |
30 | 0 | 0 | |
|
North Shore Office Building Brookhaven (t) |
50 | 0 | 0 | |
|
555 Professional Bldg. Brookhaven (t) |
30 | 0 | 0 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Sea Haven Resort Motel (fna Sun+sand) Southampton (v) |
50 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
South Harbor Park Southold (t) |
50 | 0 | 0 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Wolffer Estate Vineyard Southampton (t) |
50 | 0 | 0 | |
|
Gilgo Beach Babylon (t) |
500 | 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.