EPA system NY7003493 · New York

New York City System: No PFAS or lithium found in EPA testing

System ID NY7003493; community water system; New York; source: surface water; serves 8,271,000 people via 727,058 connections; status: active

In focus8,271,000people served, EPA registry

Public records. Clearer context.

New York City System is a local-government-owned community water system in New York serving about 8,271,000 people, matched to 211 ZIP codes.

PFAS treatment declared to EPA: None declared (16 of 16 sampling events) · PFAS found before UCMR 5: Yes, at 16 of 16 sampling events

PFAS and lithium: what EPA's national survey found

EPA tested this water for 30 substances and found none of them at levels its laboratories can measure.

Between October 2023 and January 2025, EPA's UCMR 5 program tested 480 samples from 4 sampling locations for 30 contaminants (29 PFAS plus lithium). None were found above their minimum reporting levels.

Sampling-point average: mean of a location's two (ground water) or four (surface water) UCMR 5 results with non-detects counted as zero, EPA's method for comparing UCMR 5 data to the PFAS MCLs. EPA rounds to the reference value's significant digits before deciding whether an average is "greater than" an MCL (PFOA/PFOS averages count as above 4.0 ng/L only from 4.05 ng/L; lithium results count as above the 10 ppb reference only from 15 ppb). This site does not apply that rounding: "at or above" here means the measured value is numerically at or above the reference.

Utility-reported context (UCMR 5 questionnaire, aggregated across sampling events): PFAS previously found at this system: yes at 16 of 16 sampling events; potential PFAS sources nearby: yes at 16 of 16 sampling events; PFAS treatment in place: no PFAS treatment at 16 of 16 sampling events.

Lead at customer taps

In the latest completed monitoring period, ending Dec 31, 2024, 9 in 10 sampled homes had lead at or below 10 ppb, below the 15 ppb action level that triggers utility action. The action level has been reached in 7 of the 31 periods on record.

In the most recent completed lead monitoring period, ending Dec 31, 2024, the 90th-percentile lead result at customer taps was 10 ppb, below the action level of 15 ppb; 7 of the 31 monitoring periods on record reached the action level. The 90th percentile is the value that 9 in 10 sampled homes were at or below. Values are in parts per billion (ppb).

Drinking water violations since Sep 3, 2016

EPA lists 1 violation since Sep 3, 2016. 1 is health-based, meaning a contaminant or treatment rule was not met. 1 is still open.

EPA's SDWIS database lists 1 violation recorded since Sep 3, 2016: 1 health-based (a contaminant above its maximum contaminant level, a disinfectant above its maximum residual level, or a required treatment technique not met); 1 is not yet resolved.

Sanitary surveys and site visits

Most recent state inspection: Dec 18, 2025 (sanitary survey); 79 visits since Sep 3, 2021.

What you can do about these results

ZIP codes served

Sources

Data vintage: EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.

• EPA ECHO detailed facility report
• EPA UCMR 5 Data Finder
• EPA service-area boundary: modeled, 297.5 sq mi