COUNTY WATER-SYSTEM LEDGER
Nassau, New York
EPA’s September 2026 export lists 35 active community water systems serving Nassau, New York, with 0 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Nassau, New York
EPA associates 35 covered systems with Nassau, New York; their reported population-served values total 1,347,795 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Liberty Utilities New York - LynbrookNY2902835 | 220,000 | Ground water | No current violation flagged |
| Liberty Utilities New York - MerrickNY2902840 | 135,000 | Ground water | No current violation flagged |
| Wa Of Western NassauNY2902830 | 120,000 | Ground water | No current violation flagged |
| Town Of Hempstead Water DepartmentNY2900000 | 110,000 | Ground water | No current violation flagged |
| Jericho WdNY2902831 | 58,000 | Ground water | No current violation flagged |
| Hempstead (V)NY2902827 | 56,000 | Ground water | No current violation flagged |
| Hicksville WdNY2902829 | 48,000 | Ground water | No current violation flagged |
| Freeport (V)NY2902823 | 45,000 | Ground water | No current violation flagged |
| South Farmingdale WdNY2902854 | 44,700 | Ground water | No current violation flagged |
| Manhasset Lakeville WdNY2902836 | 43,000 | Ground water | No current violation flagged |
| Massapequa WdNY2902837 | 43,000 | Ground water | No current violation flagged |
| Long Beach CityNY2902834 | 35,000 | Ground water | No current violation flagged |
| Plainview WdNY2902845 | 34,000 | Ground water | No current violation flagged |
| Port Washington WdNY2912267 | 34,000 | Ground water | No current violation flagged |
| Bethpage WdNY2902817 | 33,000 | Ground water | No current violation flagged |
| West Hempstead WdNY2902857 | 32,031 | Ground water | No current violation flagged |
| Glen Cove CityNY2902826 | 28,000 | Ground water | No current violation flagged |
| Rockville Centre (V)NY2902848 | 24,700 | Ground water | No current violation flagged |
| Garden City (V)NY2902824 | 23,272 | Ground water | No current violation flagged |
| Mineola (V)NY2902839 | 20,600 | Ground water | No current violation flagged |
| Westbury WdNY2902856 | 20,500 | Ground water | No current violation flagged |
| Franklin Square WdNY2902822 | 20,000 | Ground water | No current violation flagged |
| Garden City Park WdNY2902825 | 18,000 | Ground water | No current violation flagged |
| Roslyn WdNY2902851 | 17,000 | Ground water | No current violation flagged |
| Albertson WdNY2902815 | 13,500 | Ground water | No current violation flagged |
| Liberty Utilities New York - Sea CliffNY2902853 | 13,400 | Ground water | No current violation flagged |
| Carle Place WdNY2902818 | 9,005 | Ground water | No current violation flagged |
| Farmingdale (V)NY2902821 | 8,744 | Ground water | No current violation flagged |
| Oyster Bay WdNY2902844 | 8,700 | Ground water | No current violation flagged |
| Locust Valley WdNY2902833 | 7,500 | Ground water | No current violation flagged |
| Williston Park (V)NY2902858 | 7,287 | Ground water | No current violation flagged |
| Bayville (V)NY2902816 | 6,700 | Ground water | No current violation flagged |
| Old Westbury (V)NY2902843 | 4,700 | Ground water | No current violation flagged |
| Sands Point (V)NY2902852 | 2,900 | Ground water | No current violation flagged |
| East Williston (V)NY2902820 | 2,556 | Ground water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Nassau, New York
EPA classifies 35 systems serving Nassau, New York across 2 primary-source categories; Ground water is the largest category with 34 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.