PFAS Analyte · UCMR 5
4:2FTS
4:2 Fluorotelomer sulfonic acid
CAS 757124-72-4· UCMR 5· No individual MCL set
2
Systems monitored
with official records
2
Systems with detections
100.0% detection rate
2
Detected samples
of 2 total samples
Jun 2023 – Jan 2024
Monitoring period
per UCMR 5 schedule
Detection Rate — 4:2FTS
Systems with any detection100.0%
2 of 2 monitored systems
Sample-level detection rate100.0%
2 detections across 2 total samples
States with Most 4:2FTS Detections
Water Systems with Most 4:2FTS 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.
4:2FTS at a Glance
Full Name4:2 Fluorotelomer sulfonic acid
CAS Number757124-72-4
UCMR RoundUCMR 5
EPA MCLSee mixture rule
Systems Monitored2
Systems Detected2
Detection Rate100.0%
Note
No MCL as of April 2024.