Contaminant · PFAS
NFDHA in drinking water
Nonafluoro-3,6-dioxaheptanoic acid, an ether PFAS.
What the rules say
NFDHA has no federal limit or EPA health reference value.
Read the EPA source for NFDHA.
Across the country
EPA tested 10,307 water systems for NFDHA and found it in 4. Half of the systems that found it measured less than 26.9 ppt, and one in ten measured more than 35.9 ppt.
EPA's final UCMR 5 occurrence file contains 66,355 NFDHA results from 10,307 systems. 5 results were at or above the minimum reporting level, across 4 systems. Among detections, the median was 26.9 ppt and the 90th percentile was 35.9 ppt.
Systems with the highest recorded NFDHA results
| System | State | Population served | Recorded value | Records / periods |
|---|---|---|---|---|
| City of Clute TX0200004 | Texas | 10,604 | 26.9 ppt | 2 |
| G M WSC TX2020067 | Texas | 11,220 | 39.0 ppt | 1 |
| City of Richwood TX0200035 | Texas | 7,605 | 31.3 ppt | 1 |
| City of Cameron TX1660001 | Texas | 5,489 | 20.7 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 NFDHA or the specific contaminant you want to reduce. A utility-level record is not a test of your own faucet.