PFAS Analyte · UCMR 5

PFPeA

Perfluoropentanoic acid

CAS 2706-90-3· UCMR 5· No individual MCL set
1,941
Systems monitored
with official records
1,941
Systems with detections
100.0% detection rate
6,541
Detected samples
of 6,541 total samples
Jan 2023 – Dec 2025
Monitoring period
per UCMR 5 schedule

Detection Rate — PFPeA

Systems with any detection100.0%

1,941 of 1,941 monitored systems

Sample-level detection rate100.0%

6,541 detections across 6,541 total samples

States with Most PFPeA Detections

Water Systems with Most PFPeA 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.

PFPeA at a Glance

Full NamePerfluoropentanoic acid
CAS Number2706-90-3
UCMR RoundUCMR 5
EPA MCLSee mixture rule
Systems Monitored1,941
Systems Detected1,941
Detection Rate100.0%

Note

No MCL as of April 2024.

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