Greenlawn Water District

Water Quality Snapshot: Greenlawn Water District

Greenlawn Water District is a local-owned community water system that delivers drinking water to 42,000 residents in Greenlawn, New York (Suffolk County) through 11,500 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 87 total violations for this system , of which 4 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 48 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Nitrate-Nitrite, recorded in 5 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 3 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 11 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%).

Greenlawn Water District's 87 violations sit above 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.