PFAS test results
Highest average at any one sampling point, from EPA's UCMR 5 testing (2023–2024), 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 2 detected compounds at this system (single highest result)
| Compound | Highest result | Results above reporting level |
|---|---|---|
| PFPeA | 6.7 ppt | 4 of 8 |
| PFHxA | 4.8 ppt | 4 of 8 |
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
No health-based violations began since 2021-10-26 in the EPA file for this system.
No lead 90th-percentile result from 2021 or later is in the EPA file (latest on file ends 2020-12-31), so none is shown.
Common questions
Is the tap water in Washington Suburban Sanitary Commission safe to drink?
PFAS were detected at Washington Suburban Sanitary Commission, but every regulated compound averaged under its limit. No health-based violations recorded since 2021-10-26. No recent lead 90th-percentile result in the EPA file. This is a summary of public EPA data, not a guarantee about the water at your tap.
Does Washington Suburban Sanitary Commission have PFAS in its water?
Yes. EPA's 2023–2025 testing detected 2 of 29 PFAS compounds at Washington Suburban Sanitary Commission.
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.