PFAS test results
Highest average at any one sampling point, from EPA's UCMR 5 testing (2023–2025), against the levels EPA set in 2024. ND = not detected above EPA's reporting level. EPA's comparison rounds like this: an average of 4.05 ppt or more counts as above the 4 ppt PFOA/PFOS limit, and 15 ppt or more counts as above the 10 ppt level for PFHxS, PFNA and GenX.
Hazard index (PFHxS, PFNA, GenX, PFBS mix): 0.00 (limit 1, EPA comparison threshold 1.5).
All 1 detected compound at this system (single highest result)
| Compound | Highest result | Results above reporting level |
|---|---|---|
| lithium | 139 µg/L | 1 of 13 |
Read this as a screening result, not a compliance finding. UCMR 5 samples are occurrence data. Legal compliance is judged on a running annual average from the utility's own monitoring, reported to the state. PFOA and PFOS at 4 ppt are in force; EPA has proposed to rescind the PFHxS, PFNA, GenX and hazard-index levels.
Violations and lead
3 health-based violations began since 2021-10-26 (0 limit exceedances, 3 treatment-technique; 0 still open). Most recent began 2024-07-01.
| Contaminant group | Violations |
|---|---|
| Lead and copper rule | 3 |
Health-based means a limit exceedance or a missed treatment requirement. Many violations are fixed within weeks; a count says nothing about severity. Missed-sample (monitoring) violations are not counted.
Lead 90th percentile: 0.0 ppb for the period ending 2025-12-31 (action level 15 ppb). This is a system-wide statistic, not your home's tap; lead usually comes from household plumbing and service lines.
Lithium: highest result 139 µg/L. EPA's non-regulatory reference concentration is 10 µg/L (results above 15 are counted as above it). Lithium has no federal drinking-water limit.
What helps, and what does not
Match the filter to the contaminant, not the other way round. See the filter-fit table.
Common questions
Is the tap water in Liberty Utilities New York - Merrick safe to drink?
No PFAS were detected at Liberty Utilities New York - Merrick above EPA's reporting levels in the 2023–2025 survey. 3 health-based violations recorded since 2021-10-26 (0 not yet closed). Lead 90th percentile 0.0 ppb in the sampling period ending 2025-12-31 (action level 15 ppb). This is a summary of public EPA data, not a guarantee about the water at your tap.
Does Liberty Utilities New York - Merrick have PFAS in its water?
EPA's 2023–2025 testing did not detect any of the 29 PFAS compounds above reporting levels (reporting levels run from 2 to 20 ppt depending on the compound).
Not medical or legal advice. Results describe the utility's system, not your tap. Compare with your utility's annual Consumer Confidence Report.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.