Water quality for ZIP code 11550
ZIP 11550 covers Hempstead, South Hempstead, West Hempstead, and Uniondale in Nassau County, New York, one of 69 ZIP codes in the 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 |
|---|---|---|---|---|
| Cathedral Gardens WD Hempstead (t) |
1,500 | 0 | 0.2 mi | |
| West Hempstead WD Hempstead (t) |
32,031 | 1 | 1.9 mi | |
| Garden City (v) Garden City (v) |
23,272 | 0 | 2.0 mi | |
| Rockville Centre (v) Rockville Center (v) |
24,700 | 0 | 2.7 mi | |
| Franklin Square WD Hempstead (t), Stewart Manor (v) |
20,000 | 0 | 3.2 mi | |
| Mineola (v) Mineola (v) |
20,600 | 0 | 3.3 mi | |
| Town of Hempstead Water Department Hempstead (t) |
110,000 | 0 | 3.5 mi | |
| Carle Place WD North Hempstead (t) |
9,005 | 0 | 3.5 mi | |
| Freeport (v) Freeport (v) |
45,000 | 0 | 3.9 mi | |
| Williston Park (v) Williston Park (v) |
7,287 | 0 | 4.2 mi | |
| East Williston (v) East Williston (v) |
2,556 | 0 | 4.2 mi | |
| WA of Western Nassau Hempstead (t), North Hempstead (t) |
120,000 | 0 | 4.2 mi | |
| Garden City Park WD New Hyde Park (v) |
18,000 | 0 | 4.4 mi | |
| Westbury WD North Hempstead (t), Westbury (v) |
20,500 | 0 | 4.8 mi | |
| Liberty Utilities New York Lynbrook Hempstead (t), Lynbrook (v) |
220,000 | 1 | 4.8 mi | |
| Albertson WD North Hempstead (t) |
13,500 | 1 | 5.2 mi | |
| Liberty Utilities New York Merrick Hempstead (t) |
135,000 | 1 | 6.0 mi | |
| Old Westbury (v) Old Westbury (v) |
4,700 | 1 | 6.0 mi | |
| Hicksville WD Oyster Bay (t) |
48,000 | 0 | 6.4 mi | |
| Manhasset Lakeville WD North Hempstead (t) |
43,000 | 0 | 6.7 mi | |
| Roslyn WD Roslyn (v) |
17,000 | 0 | 6.7 mi | |
| Lido-Point Lookout WD Hempstead (t) |
2,000 | 0 | 7.7 mi | |
| Bethpage WD Oyster Bay (t) |
33,000 | 0 | 7.9 mi | |
| Long Beach City Long Beach (c) |
35,000 | 0 | 8.2 mi | |
| Plandome (v) Plandome (v) |
1,600 | 0 | 8.5 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 |
|---|---|---|---|---|
|
Jones Beach State Park Hempstead (t) |
30,799 | 0 | 0 | |
|
Tobay Beach Oyster Bay (t) |
2,410 | 0 | 0 | |
|
Beaver Dam Winter Sports Matinecock (v), Oyster Bay (t) |
35 | 0 | 0 | |
|
Seawanhaka Yacht Club Centre Island (v), Oyster Bay (t) |
60 | 0 | 0 |
About this data
Water systems are matched to Nassau 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. Retrieved from ECHO on Oct 11, 2026.