Contaminant · PFAS
9Cl-PF3ONS in drinking water
A chlorinated polyfluoroether sulfonate (component of F-53B) used in metal plating.
What the rules say
9Cl-PF3ONS has no federal limit or EPA health reference value.
Read the EPA source for 9Cl-PF3ONS.
Across the country
EPA tested 10,307 water systems for 9Cl-PF3ONS and found it in 1. Half of the systems that found it measured less than 3.4 ppt, and one in ten measured more than 3.4 ppt.
EPA's final UCMR 5 occurrence file contains 66,343 9Cl-PF3ONS results from 10,307 systems. 1 results were at or above the minimum reporting level, across 1 systems. Among detections, the median was 3.4 ppt and the 90th percentile was 3.4 ppt.
Systems with the highest recorded 9Cl-PF3ONS results
| System | State | Population served | Recorded value | Records / periods |
|---|---|---|---|---|
| Ponca City Mun Water OK1021202 | Oklahoma | 27,155 | 3.4 ppt | 1 |
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 9Cl-PF3ONS or the specific contaminant you want to reduce. A utility-level record is not a test of your own faucet.