PFAS Analyte · UCMR 5

PFHpA

Perfluoroheptanoic acid

CAS 375-85-9· UCMR 5· No individual MCL set
530
Systems monitored
with official records
530
Systems with detections
100.0% detection rate
1,422
Detected samples
of 1,422 total samples
Jan 2023 – Nov 2025
Monitoring period
per UCMR 5 schedule

Detection Rate — PFHpA

Systems with any detection100.0%

530 of 530 monitored systems

Sample-level detection rate100.0%

1,422 detections across 1,422 total samples

States with Most PFHpA Detections

Water Systems with Most PFHpA Detections

Systems ranked by number of samples detected above the minimum reporting limit. Detection count reflects monitoring frequency, not concentration level.

All records are from official EPA UCMR 5 monitoring data. Detection counts reflect the number of samples where the analyte was reported above the minimum reporting limit (MRL). They are not compliance determinations and do not imply a health violation.

PFHpA at a Glance

Full NamePerfluoroheptanoic acid
CAS Number375-85-9
UCMR RoundUCMR 5
EPA MCLSee mixture rule
Systems Monitored530
Systems Detected530
Detection Rate100.0%

Note

No individual MCL. Part of PFAS mixture Hazard Index rule (April 2024).

EPA PFAS Drinking Water RegulationEPA UCMR 5 Source Data Back to PFAS Watchlist