Suffolk County Water Authority

Water Quality Snapshot: Suffolk County Water Authority

Suffolk County Water Authority is a local-owned community water system that delivers drinking water to 1,100,000 residents in Hauppauge, New York (Suffolk County) through 336,418 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 42 total violations for this system , of which 14 (33%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 13 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Nitrate, recorded in 6 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 10 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 43.5 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across New York, EPA tracks 8,098 public water systems serving 19,294,951 people, with 552,003 cumulative violations and 26,817 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 68.2 violations. Statewide, 129 of 332 UCMR5-tested systems have reported PFAS detections (38.9%).

Suffolk County Water Authority's 42 violations sit below the New York average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.