Contaminant · PFAS
PFHpS in drinking water
Perfluoroheptanesulfonic acid.
What the rules say
PFHpS has no federal limit or EPA health reference value.
Read the EPA source for PFHpS.
Across the country
EPA tested 10,307 water systems for PFHpS and found it in 5. Half of the systems that found it measured less than 3.4 ppt, and one in ten measured more than 5.2 ppt.
EPA's final UCMR 5 occurrence file contains 66,361 PFHpS results from 10,307 systems. 6 results were at or above the minimum reporting level, across 5 systems. Among detections, the median was 3.4 ppt and the 90th percentile was 5.2 ppt.
Systems with the highest recorded PFHpS results
| System | State | Population served | Recorded value | Records / periods |
|---|---|---|---|---|
| Duxbury Water Department MA4082000 | Massachusetts | 16,387 | 3.3 ppt | 2 |
| Running Springs Water District CA3610062 | California | 5,268 | 5.5 ppt | 1 |
| Nashville, Town of NC0464020 | North Carolina | 5,900 | 3.6 ppt | 1 |
| Ridgewood Water NJ0251001 | New Jersey | 61,700 | 3.0 ppt | 1 |
| East Cedar Creek FWSD Brookshire TX1070167 | Texas | 14,823 | 4.9 ppt | 1 |
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 PFHpS or the specific contaminant you want to reduce. A utility-level record is not a test of your own faucet.