Contaminant · PFAS
PFMBA in drinking water
Perfluoro-4-methoxybutanoic acid, an ether PFAS.
What the rules say
PFMBA has no federal limit or EPA health reference value.
Read the EPA source for PFMBA.
Across the country
EPA tested 10,307 water systems for PFMBA and found it in 1. Half of the systems that found it measured less than 3.0 ppt, and one in ten measured more than 3.0 ppt.
EPA's final UCMR 5 occurrence file contains 66,361 PFMBA results from 10,307 systems. 2 results were at or above the minimum reporting level, across 1 systems. Among detections, the median was 3.0 ppt and the 90th percentile was 3.0 ppt.
Systems with the highest recorded PFMBA results
| System | State | Population served | Recorded value | Records / periods |
|---|---|---|---|---|
| Iowa-American Wtr Co-Clinton District IA2326048 | Iowa | 24,769 | 3.0 ppt | 2 |
Filters and testing
NSF/ANSI 58 (reverse osmosis)
A standard number by itself is not a contaminant claim. Check the product's current certification listing and performance data sheet for PFMBA or the specific contaminant you want to reduce. A utility-level record is not a test of your own faucet.