Is Suffolk County Tap Water Safe? What Suffolk County Water Authority’s EPA Records Show
Suffolk County Water Authority, which serves about 1,100,000 people in Suffolk County, Long Island, reported PFOA, PFOS, PFHxS above the EPA limit in the EPA’s UCMR5 PFAS monitoring (2023-2025). That is the system’s own reported occurrence — “reported above the limit,” not “in violation”; enforcement of the PFAS limits phases in through 2029-2031. Its most recent EPA-record lead 90th-percentile was 1.25 ppb — under the current 15 ppb action level. The system has 14 health-based violations on its federal SDWA record.
See the full interactive report for this system — every PFAS analyte, lead and copper rounds, violations, and the filter that handles what was found: open the Suffolk County report → Or check YOUR exact ZIP: check your water by ZIP →
Common questions about Suffolk County water
Is Suffolk County's tap water safe to drink?
The records show PFOA, PFOS, PFHxS above a current EPA limit or action level — the details, with dates, are in the sections above. That is a system-level occurrence record, not a verdict on any individual tap. These are system-level records for public water systems, not a reading of any individual home’s tap, and they do not cover private wells. Confirm your own utility’s current Consumer Confidence Report, and test your tap if you’re unsure.
Does Suffolk County have PFAS in its drinking water?
Suffolk County Water Authority reported PFOA, PFOS, PFHxS above the EPA’s limit in UCMR5 monitoring — an occurrence flag, not a compliance finding (enforcement 2029-2031).
Who supplies Suffolk County's drinking water?
Suffolk County Water Authority (PWSID NY5110526) serves about 1,100,000 people in Suffolk County, Long Island, per EPA SDWIS records. A metro area is usually served by more than one water system — this page covers the area’s largest. Suburbs and neighboring towns often have their own systems with their own results; check your exact ZIP for yours.
How do I check my exact address?
Water systems report by system, not by address. Enter your ZIP on the water checker to see the system(s) serving it and what each reported.
Statewide, 9.9% of New York’s UCMR5-tested systems reported PFOA or PFOS over the EPA limit — see the New York water page.
Other large systems in New York
New York City Monroe County (the Rochester suburbs), New York Onondaga County (the Syracuse area), New York
See the 100 largest US water systems, water quality by state, and the national PFAS data study.
Sources: EPA UCMR5 occurrence data, Feb 2026 release (~95% complete; final reporting 2026) (2026-06); lead/copper + violations: EPA SDWIS via ECHO; population served: EPA SDWIS via ECHO (system-reported population served). PWSID NY5110526. Public-domain federal/state records; assembly by WaterByTheBook. Built 2026-07-25. Plain-markdown mirror: https://waterbythebook.com/md/suffolk-county.md