Contaminant · PFAS
PFUnA in drinking water
Perfluoroundecanoic acid, a long-chain PFAS.
What the rules say
PFUnA has no federal limit or EPA health reference value.
Read the EPA source for PFUnA.
Across the country
EPA tested 10,307 water systems for PFUnA and found it in 6. Half of the systems that found it measured less than 2.7 ppt, and one in ten measured more than 13.6 ppt.
EPA's final UCMR 5 occurrence file contains 66,358 PFUnA results from 10,307 systems. 12 results were at or above the minimum reporting level, across 6 systems. Among detections, the median was 2.7 ppt and the 90th percentile was 13.6 ppt.
Systems with the highest recorded PFUnA results
| System | State | Population served | Recorded value | Records / periods |
|---|---|---|---|---|
| Emmaus Borough Public Water PA3390032 | Pennsylvania | 14,000 | 22.2 ppt | 3 |
| City of Pflugerville TX2270014 | Texas | 63,464 | 2.7 ppt | 4 |
| Doylestown Boro Water Dept PA1090081 | Pennsylvania | 8,700 | 3.0 ppt | 1 |
| Manville WSC TX2270033 | Texas | 39,648 | 2.7 ppt | 1 |
| Pa Amer Water Co Frackville PA3540032 | Pennsylvania | 5,583 | 2.3 ppt | 1 |
| Veolia Water Delaware, INC DE0000564 | Delaware | 100,495 | 3.8 ppt | 2 |
Filters and testing
NSF/ANSI 53 or 58 with a PFAS reduction claim
A standard number by itself is not a contaminant claim. Check the product's current certification listing and performance data sheet for PFUnA or the specific contaminant you want to reduce. A utility-level record is not a test of your own faucet.