PFAS Analyte · UCMR 5
PFMBA
Perfluoro-4-methoxybutanoic acid
CAS 863090-89-5· UCMR 5· No individual MCL set
1
Systems monitored
with official records
1
Systems with detections
100.0% detection rate
2
Detected samples
of 2 total samples
May 2023 – Oct 2023
Monitoring period
per UCMR 5 schedule
Detection Rate — PFMBA
Systems with any detection100.0%
1 of 1 monitored systems
Sample-level detection rate100.0%
2 detections across 2 total samples
States with Most PFMBA Detections
Water Systems with Most PFMBA 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.
PFMBA at a Glance
Full NamePerfluoro-4-methoxybutanoic acid
CAS Number863090-89-5
UCMR RoundUCMR 5
EPA MCLSee mixture rule
Systems Monitored1
Systems Detected1
Detection Rate100.0%
Note
No MCL as of April 2024.