Water quality in Northwest Harbor, New York
Northwest Harbor 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 |
|---|---|---|---|---|
| Maidstone Park Cottages East Hampton (v) |
34 | 2 | 2.5 mi | |
| Dering Harbor Water District Shelter Island (t) |
14 | 0 | 3.2 mi | |
| Shelter Island Heights Association Shelter Island (t) |
500 | 2 | 7.1 mi | |
| West Neck Water District Shelter Island (t) |
100 | 0 | 7.5 mi | |
| Fishers Island Water Works Southold (t) |
380 | 1 | 9.7 mi | |
| Greenport Water District Southold (t) |
2,050 | 1 | 10.1 mi | |
| Hampton Bays Water District Southampton (t) |
12,500 | 0 | 18.5 mi | |
| Calverton Hills Owners Association Brookhaven (t) |
897 | 2 | 24.0 mi | |
| Peconic River Mobile Home Park Riverhead (t) |
75 | 0 | 24.8 mi | |
| Riverhead Water District Riverhead (t) |
35,000 | 1 | 26.4 mi | |
| Peconic View Mobile Home Park Riverhead (t) |
40 | 0 | 26.4 mi | |
| Riverside Water District Southampton (v) |
2,050 | 0 | 32.2 mi | |
| Brookhaven National Laboratory Brookhaven (t) |
3,500 | 0 | 35.1 mi | |
| Seaview Water Company Brookhaven (t) |
1,400 | 0 | 39.5 mi | |
| ST James Water District Smithtown (t) |
10,587 | 0 | 49.3 mi | |
| Smithtown Water District Smithtown (t) |
19,635 | 0 | 53.2 mi | |
| Ocean Beach Water District Islip (t) |
4,500 | 0 | 55.1 mi | |
| Saltaire Water District Islip (t) |
2,000 | 0 | 56.8 mi | |
| Greenlawn Water District Huntington (t) |
42,000 | 3 | 59.8 mi | |
| Dix Hills Water District Huntington (t) |
34,522 | 1 | 60.6 mi | |
| Robert Moses State Park Babylon (t) |
11,600 | 0 | 61.9 mi | |
| Oak Beach Public Water Supply Babylon (t) |
66 | 1 | 61.9 mi | |
| Northport VA Hospital Huntington (t) |
3,088 | 1 | 62.6 mi | |
| South Huntington Water District Huntington (t) |
81,760 | 1 | 64.0 mi | |
| West Gilgo Beach Association Babylon (t) |
300 | 0 | 68.5 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 |
|---|---|---|---|---|
|
Camp Quinipet Shelter Island (t) |
150 | 0 | 0 | |
|
Swans Marina East Hampton (v) |
200 | 0 | 0 | |
|
East Hampton Point East Hampton (v) |
100 | 1 | 1 | |
|
Maidstone Harbor Marina East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Market East Hampton (t) |
100 | 0 | 0 | |
|
Maidstone Park Beach/ballfield East Hampton (t) |
100 | 0 | 0 | |
|
Alberts Landing East Hampton (t) |
75 | 0 | 0 | |
|
Long House Reserve East Hampton (t) |
50 | 0 | 0 | |
|
Rita Cantina East Hampton (t) |
70 | 0 | 0 | |
|
Sag Harbor State Golf Course Southampton (t) |
200 | 0 | 0 | |
|
Camp Blue Bay East Hampton (v) |
200 | 0 | 0 | |
|
Buckskill Tennis Club East Hampton (v) |
60 | 0 | 0 | |
|
Fresh Pond Road Park & Beach East Hampton (v) |
100 | 0 | 0 | |
|
Fort Pond House East Hampton (t) |
50 | 0 | 0 | |
|
South Lake Drive Park East Hampton (t) |
50 | 0 | 0 | |
|
Barcelona Bungalows East Hampton (v) |
36 | 0 | 0 | |
|
Maidstone Gun Club East Hampton (t) |
100 | 0 | 0 | |
|
Old Stone Market Brookhaven (t) |
125 | 0 | 0 | |
|
Speedway #7794 (fna Hess General Store) East Hampton (t) |
200 | 0 | 0 | |
|
Wolffer Estates Stables Southampton (t) |
45 | 1 | 0 | |
|
LA Capannina Southampton (t) |
100 | 0 | 0 | |
|
Whales Tale Shelter Island (t) |
150 | 0 | 0 | |
|
Perlman Music School Shelter Island (t) |
80 | 0 | 0 | |
|
Islander(pat & Steves Family Restaurant Shelter Island (t) |
75 | 0 | 0 | |
|
Shelter Island Slice Shelter Island (t) |
60 | 1 | 0 | |
|
Commander Cody Seafood Shelter Island (t) |
50 | 0 | 0 | |
|
Old Stove Pub Southampton (t) |
150 | 1 | 0 | |
|
Amagansett Laundry East Hampton (t) |
50 | 0 | 0 | |
|
Wolffer Estate Vineyard Southampton (t) |
50 | 0 | 0 | |
|
Rams Head Inn Shelter Island (t) |
50 | 0 | 0 | |
|
Mashomack Pres. Visitor Ctr. Shelter Island (t) |
50 | 0 | 0 | |
|
Townline Bbq East Hampton (t) |
150 | 0 | 0 | |
|
Shelter Island Senior Citizens Center Shelter Island (t) |
35 | 0 | 0 | |
|
Vine Street Cafe Shelter Island (t) |
80 | 0 | 0 | |
|
Wades Beach Shelter Island (t) |
75 | 0 | 0 | |
|
Ellis Country Market Shelter Island (t) |
50 | 0 | 0 | |
|
Mill Creek Marina Southampton (t) |
100 | 0 | 0 | |
|
Coecles Harbor Marina Shelter Island (t) |
150 | 0 | 0 | |
|
Island Boatyard & Marina Shelter Island (t) |
100 | 0 | 0 | |
|
All Seasons Catering Shelter Island (t) |
50 | 0 | 0 | |
|
Kyles (previously Cafe 27) Shelter Island (t) |
150 | 0 | 0 | |
|
Shelter Island School Shelter Island (t) |
315 | 1 | 0 | |
|
Shelter Island Nutrition Program Shelter Island (t) |
75 | 0 | 0 | |
|
Shelter Island Town Hall Shelter Island (t) |
50 | 0 | 0 | |
|
American Legion Post #281 Shelter Island (t) |
100 | 0 | 0 | |
|
Shelter Island Library |
258 | 0 | 0 | |
|
Cards Cottages Shelter Island (t) |
60 | 0 | 0 | |
|
Marias Kitchen Shelter Island (t) |
25 | 0 | 0 | |
|
Opties and Dinghies Shelter Island (t) |
50 | 0 | 0 | |
|
Atlantic Golf Club Southampton (t) |
100 | 0 | 0 |
About this data
Water systems are matched to Suffolk County, nearest to Northwest Harbor 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.