COUNTY WATER-SYSTEM LEDGER
Suffolk, New York
EPA’s September 2026 export lists 12 active community water systems serving Suffolk, New York, with 1 current-violation flags and 1 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 Suffolk, New York
EPA associates 12 covered systems with Suffolk, New York; their reported population-served values total 1,358,692 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 |
|---|---|---|---|
| Suffolk County Water AuthorityNY5110526 | 1,100,000 | Ground water | No current violation flagged |
| South Huntington Water DistrictNY5103263 | 81,760 | Ground water | No current violation flagged |
| Greenlawn Water DistrictNY5103271 | 42,000 | Ground water | Current serious-violator flag |
| Riverhead Water DistrictNY5103705 | 35,000 | Ground water | No current violation flagged |
| Dix Hills Water DistrictNY5103276 | 34,522 | Ground water | No current violation flagged |
| Smithtown Water DistrictNY5105656 | 19,635 | Ground water purchased | No current violation flagged |
| Hampton Bays Water DistrictNY5103704 | 12,500 | Ground water | No current violation flagged |
| Robert Moses State ParkNY5117671 | 11,600 | Ground water | No current violation flagged |
| St James Water DistrictNY5103266 | 10,587 | Ground water purchased | No current violation flagged |
| Ocean Beach Water DistrictNY5103280 | 4,500 | Ground water | No current violation flagged |
| Brookhaven National LaboratoryNY5111891 | 3,500 | Ground water | No current violation flagged |
| Northport Va HospitalNY5111894 | 3,088 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Suffolk, New York
EPA classifies 12 systems serving Suffolk, New York across 2 primary-source categories; Ground water is the largest category with 10 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.