Water quality in Locust Valley, New York
Locust Valley is in Nassau County. 44 active public water systems serve the county; 8 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 Nassau County
39 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Glen Cove City Glen Cove (c) |
28,000 | 0 | 2.1 mi | |
| Bayville (v) Bayville (v) |
6,700 | 1 | 2.6 mi | |
| Glenwood WD Oyster Bay (t) |
1,000 | 0 | 3.1 mi | |
| Liberty Utilities New York Mill Neck Mill Neck (v), Oyster Bay (t) |
280 | 0 | 3.2 mi | |
| Liberty Utilities New York Sea Cliff Sea Cliff (v) |
13,400 | 0 | 3.4 mi | |
| Oyster Bay WD Oyster Bay (t) |
8,700 | 0 | 3.7 mi | |
| Jericho WD Oyster Bay (t) |
58,000 | 1 | 4.8 mi | |
| Port Washington WD North Hempstead (t) |
34,000 | 0 | 6.0 mi | |
| Roslyn WD Roslyn (v) |
17,000 | 0 | 6.2 mi | |
| Sands Point (v) North Hempstead (t), Sands Point (v) |
2,900 | 0 | 6.2 mi | |
| Old Westbury (v) Old Westbury (v) |
4,700 | 1 | 6.3 mi | |
| Plandome (v) Plandome (v) |
1,600 | 0 | 7.7 mi | |
| Albertson WD North Hempstead (t) |
13,500 | 1 | 7.8 mi | |
| Westbury WD North Hempstead (t), Westbury (v) |
20,500 | 0 | 8.1 mi | |
| East Williston (v) East Williston (v) |
2,556 | 0 | 8.4 mi | |
| Hicksville WD Oyster Bay (t) |
48,000 | 0 | 8.8 mi | |
| Williston Park (v) Williston Park (v) |
7,287 | 0 | 8.8 mi | |
| Carle Place WD North Hempstead (t) |
9,005 | 0 | 8.8 mi | |
| Manhasset Lakeville WD North Hempstead (t) |
43,000 | 0 | 8.8 mi | |
| Mineola (v) Mineola (v) |
20,600 | 0 | 9.4 mi | |
| Garden City Park WD New Hyde Park (v) |
18,000 | 0 | 9.6 mi | |
| Plainview WD Oyster Bay (t) |
34,000 | 0 | 9.7 mi | |
| Bethpage WD Oyster Bay (t) |
33,000 | 0 | 10.7 mi | |
| Garden City (v) Garden City (v) |
23,272 | 0 | 10.9 mi | |
| Town of Hempstead Water Department Hempstead (t) |
110,000 | 0 | 10.9 mi |
Non-community systems in Nassau County (4: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Beaver Dam Winter Sports Matinecock (v), Oyster Bay (t) |
35 | 0 | 0 | |
|
Seawanhaka Yacht Club Centre Island (v), Oyster Bay (t) |
60 | 0 | 0 | |
|
Jones Beach State Park Hempstead (t) |
30,799 | 0 | 0 | |
|
Tobay Beach Oyster Bay (t) |
2,410 | 0 | 0 |
About this data
Water systems are matched to Nassau County, nearest to Locust Valley 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.