Perfluorononanoic acid (PFNA)
North Castle Water District #4
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 | 0.231 ppt | 9 | 2 | ND - 1.13 ppt |
| 2022 | 0.194 ppt | 20 | 4 | ND - 1.11 ppt |
| 2023 | 0.214 ppt | 23 | 6 | ND - 1.18 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 |
|---|---|---|
| 2021-08-10 | L214312301-PFAS | ND |
| 2021-08-10 | L214312302-PFAS | ND |
| 2021-08-11 | L214313405-PFAS | ND |
| 2021-08-11 | L214313403-PFAS | 1.13 ppt |
| 2021-09-30 | L215350401-PFAS | ND |
| 2021-12-28 | L217129101-PFAS | 0.946 ppt |
| 2021-12-28 | L217129603-PFAS | ND |
| 2021-12-28 | L217129602-PFAS | ND |
| 2021-12-28 | L217129104-PFAS | ND |
| 2022-02-10 | L220739201-PFAS | ND |
| 2022-03-29 | L221627006-PFAS | 1.11 ppt |
| 2022-03-29 | L221627003-PFAS | ND |
| 2022-03-29 | L221627005-PFAS | ND |
| 2022-03-29 | L221627001-PFAS | ND |
| 2022-05-05 | L222365901-PFAS | ND |
| 2022-06-28 | L2234461-01-PFAS | ND |
| 2022-06-28 | L2234461-05-PFAS | ND |
| 2022-06-28 | L2234461-02-PFAS | ND |
| 2022-06-28 | L2234461-04-PFAS | 0.917 ppt |
| 2022-08-01 | L2241135-05-PFAS | ND |
| 2022-09-28 | L2253737-01-PFAS | ND |
| 2022-09-28 | L2253737-04-PFAS | ND |
| 2022-09-28 | L2253737-03-PFAS | 1.08 ppt |
| 2022-09-28 | L2253737-02-PFAS | ND |
| 2022-10-26 | L2259860-05-PFAS | ND |
| 2022-12-01 | L2267398-09-PFAS | 0.766 ppt |
| 2022-12-01 | L2267398-10-PFAS | ND |
| 2022-12-01 | L2267398-07-PFAS | ND |
| 2022-12-01 | L2267398-08-PFAS | ND |
| 2023-01-05 | L2300642-01-PFAS | ND |
| 2023-02-16 | L2308678-05-PFAS | ND |
| 2023-02-16 | L2308678-02-PFAS | ND |
| 2023-02-16 | L2308678-04-PFAS | 0.741 ppt |
| 2023-02-16 | L2308678-01-PFAS | ND |
| 2023-02-16 | L2308678-03-PFAS | 0.819 ppt |
| 2023-03-27 | L2315931-01-PFAS | ND |
| 2023-05-04 | L2324575-04-PFAS | ND |
| 2023-05-04 | L2324575-05-PFAS | ND |
| 2023-05-04 | L2324575-03-PFAS | 0.748 ppt |
| 2023-05-04 | L2324575-02-PFAS | ND |
| 2023-05-04 | L2324575-01-PFAS | ND |
| 2023-06-06 | L2331570-01-PFAS | ND |
| 2023-08-15 | L2347441-03-PFAS | ND |
| 2023-08-15 | L2347441-02-PFAS | ND |
| 2023-08-15 | L2347441-01-PFAS | 0.806 ppt |
| 2023-08-15 | L2347441-04-PFAS | ND |
| 2023-09-27 | L2357061-01-PFAS | ND |
| 2023-10-31 | L2364493-04-PFAS | ND |
| 2023-10-31 | L2364493-06-PFAS | ND |
| 2023-10-31 | L2364493-03-PFAS | 1.18 ppt |
| 2023-10-31 | L2364493-01-PFAS | ND |
| 2023-10-31 | L2364493-02-PFAS | 0.620 ppt |