Water quality in Yaphank, New York
Yaphank 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 | 4.0 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 4.4 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 7.0 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 12.0 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 12.9 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 13.5 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 14.5 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 15.3 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 15.5 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 17.4 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 18.5 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 21.5 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 21.7 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 21.7 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 22.7 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 23.3 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 25.0 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 25.3 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 29.6 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 34.6 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 35.1 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 35.4 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 39.2 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 41.2 mi | |
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 41.6 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 |
|---|---|---|---|---|
|
Shell Station Yaphank |
100 | 1 | 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 | |
|
Valero Brookhaven (t) |
1,000 | 0 | 0 | |
|
Caribbean Spot Brookhaven (t) |
200 | 0 | 0 | |
|
Oldcastle Infrastructure Brookhaven (t) |
40 | 0 | 0 | |
|
Joes Kwik Mart Brookhaven (t) |
200 | 0 | 0 | |
|
First Student-Middle Island(was Laidlaw) Brookhaven (t) |
125 | 0 | 0 | |
|
BP Gas-Ridge Brookhaven (t) |
75 | 0 | 0 | |
|
YMCA Brookhaven Roe Brookhaven (t) |
100 | 0 | 0 | |
|
Long Island Game Farm Brookhaven (t) |
200 | 0 | 0 | |
|
Bellport Village Beach Brookhaven (t) |
50 | 0 | 0 | |
|
555 Professional Bldg. Brookhaven (t) |
30 | 0 | 0 | |
|
Rock Hill Country Club Brookhaven (t) |
150 | 0 | 0 | |
|
East Moriches Primary Care |
500 | 0 | 0 | |
|
Great Gun Beach Brookhaven (t) |
100 | 1 | 0 | |
|
North Shore Office Building Brookhaven (t) |
50 | 0 | 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 | |
|
Kings Park Launch Ramp Smithtown (t) |
100 | 0 | 0 | |
|
D. S. Shanahans Smithtown (t) |
150 | 0 | 0 | |
|
Captree State Park Babylon (t) |
4,100 | 0 | 0 | |
|
EV and EM Vineyard Riverhead (t) |
100 | 0 | 0 | |
|
Shelter Island Iga Market Shelter Island (t) |
100 | 0 | 0 | |
|
Cedar Beach Sportfishing Educ. Center Babylon (t) |
200 | 0 | 0 | |
|
Sea Haven Resort Motel (fna Sun+sand) Southampton (v) |
50 | 0 | 0 | |
|
Rose Hill Vineyards |
30 | 0 | 0 | |
|
McCall Farm Winery Southold (t) |
40 | 0 | 0 | |
|
Overlook Beach Babylon (t) |
450 | 0 | 0 | |
|
Cedar Beach (golf Course/concession) Babylon (t) |
500 | 0 | 0 | |
|
LA Antigua Southold (t) |
150 | 0 | 0 | |
|
Pugliese Vineyards Southold (t) |
50 | 1 | 0 | |
|
Sandy Hollow Day Camp Southampton (t) |
120 | 0 | 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 | |
|
Oysterpond Elementary School Southold (t) |
106 | 1 | 0 | |
|
Jefferson Temple Church of God in Christ Southold (t) |
100 | 0 | 0 | |
|
Kingdom Hall of Jehovah Witnesses |
500 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Pridwin Hotel Shelter Island (t) |
100 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Yaphank 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.