PFAS in New York drinking water

Highest PFAS-4 in New York

Ranked by the PFAS-4 sum in each system's headline sample. The pill flags PFOA or PFOS above the 2029 federal MCL.

Counties (60)

Other water systems in New York (305)

Largest first. "Not detected" means below the 3 to 4 ng/L reporting limits, not zero.

New York PFAS limits (state MCLs)

Source: New York State Department of Health (NYSDOH), Bureau of Water Supply Protection, 10 NYCRR Subpart 5-1. https://www.health.ny.gov/environmental/water/drinking/regulations/

How to read these numbers

This page lists all 320 community water systems in New York with UCMR 5 PFAS results, across 60 counties. We compare each one with our 0.5 ng/L PFAS-4 benchmark and with the 4.0 ng/L federal MCL for PFOA and PFOS, which applies from April 2029. UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards. The samples come from entry points, with 3 to 4 ng/L reporting limits. New York also enforces its own PFAS MCLs under 10 NYCRR Subpart 5-1 (table above). State agency: New York State Department of Health (NYSDOH), Bureau of Water Supply Protection. State monitoring: quarterly compliance monitoring since 2020; annual mean and maximum per system published by the Environmental Public Health Tracker. Regulation data retrieved September 19, 2026.