Water quality in Mastic, New York
Mastic 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 |
|---|---|---|---|---|
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 3.9 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 4.3 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 4.8 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 10.2 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 11.4 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 11.4 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 12.0 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 16.6 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 17.5 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 19.7 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 20.1 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 21.2 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 26.0 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 26.1 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 26.3 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 26.3 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 29.5 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 29.7 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 31.7 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 32.1 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 32.8 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 32.9 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 36.6 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 37.8 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 38.0 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 |
|---|---|---|---|---|
|
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 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
Varneys Restaurant Brookhaven (t) |
48 | 0 | 0 | |
|
1983 Montauk Hwy Offices Coparts Brookhaven (t) |
190 | 0 | 0 | |
|
Shell Station Yaphank |
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 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 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 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Sea Haven Resort Motel (fna Sun+sand) Southampton (v) |
50 | 0 | 0 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 0 | 0 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Lenz Winery Southold (t) |
50 | 2 | 0 | |
|
BP Mart Peconic Southold (t) |
100 | 1 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
Corey Creek Vineyards Southold (t) |
75 | 1 | 0 | |
|
South Harbor Park Southold (t) |
50 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Pridwin Hotel Shelter Island (t) |
100 | 0 | 0 | |
|
Island Boatyard & Marina Shelter Island (t) |
100 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Mastic 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.