Perfluorononanoic acid (PFNA)
Delancy Street Foundation (castle)
Perfluorononanoic acid, otherwise known as PFNA or C9, is a PFC similar in function and use to PFOA. These chemicals were used in the production of non-stick, stain repellent and chemically inert coatings. Click here to read more about perfluorinated chemicals.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 1.80 ppt | 6 | 5 | ND - 2.38 ppt |
| 2022 | 1.41 ppt | 6 | 5 | ND - 1.88 ppt |
| 2023 | 0.976 ppt | 7 | 5 | ND - 1.82 ppt |
ppt = parts per trillion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.006 ppt
The EWG Health Guideline of 6 ppt for perfluorononanoic acid was defined by EPA recommended application of the toxicity value for PFDA published in the Integrated Risk Information System’s toxicological review . This health guideline harm to the immune system and harm to fetal growth and child development.
EPA Maximum Contaminant
Level (MCL): 10 ppt
ppt = parts per trillion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2021-05-28 | CI40956PFAS | 2.28 ppt |
| 2021-06-21 | CI59282PFAS | 2.26 ppt |
| 2021-08-31 | CJ18182PFAS | 2.38 ppt |
| 2021-09-16 | CJ30591PFAS | ND |
| 2021-11-24 | CL85244PFAS | 1.82 ppt |
| 2021-12-16 | CK00417PFAS | 2.06 ppt |
| 2022-03-07 | CK81666 | 1.49 ppt |
| 2022-03-22 | CK91516 | 1.88 ppt |
| 2022-05-25 | CL38342 | 1.60 ppt |
| 2022-09-16 | CM33905PFAS | 1.77 ppt |
| 2022-11-29 | CM93339 | 1.71 ppt |
| 2022-12-13 | CN03737 | ND |
| 2023-02-02 | CN34870 | ND |
| 2023-06-06 | CO20666PFAS | 1.01 ppt |
| 2023-06-20 | CO32816PFAS | 1.82 ppt |
| 2023-08-22 | CO81340PFAS | 1.41 ppt |
| 2023-09-13 | CO98818PFAS | 1.62 ppt |
| 2023-12-11 | CP64637PFAS | 0.975 ppt |
| 2023-12-21 | CP73311PFAS | ND |