Perfluorononanoic acid (PFNA)
Topsfield Water Department
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 |
|---|---|---|---|---|
| 2014 | ND | 4 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 0.646 ppt | 4 | 4 | 0.473 ppt - 0.830 ppt |
| 2021 | 0.723 ppt | 30 | 28 | ND - 1.17 ppt |
| 2022 | 0.350 ppt | 26 | 14 | ND - 0.847 ppt |
| 2023 | 0.300 ppt | 20 | 9 | ND - 0.767 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 | Result |
|---|---|
| 2014-02-12 | ND |
| 2014-02-12 | ND |
| 2014-08-18 | ND |
| 2014-08-18 | ND |
| 2020-02-19 | 0.830 ppt |
| 2020-02-19 | 0.473 ppt |
| 2020-07-17 | 0.676 ppt |
| 2020-07-17 | 0.605 ppt |
| 2021-01-22 | 1.17 ppt |
| 2021-01-22 | 1.13 ppt |
| 2021-01-29 | 0.995 ppt |
| 2021-01-29 | 0.820 ppt |
| 2021-01-29 | 0.900 ppt |
| 2021-02-03 | 0.720 ppt |
| 2021-02-03 | 0.940 ppt |
| 2021-02-03 | 0.720 ppt |
| 2021-03-03 | 0.580 ppt |
| 2021-03-03 | 0.510 ppt |
| 2021-04-14 | 0.710 ppt |
| 2021-04-14 | 0.660 ppt |
| 2021-07-02 | 0.670 ppt |
| 2021-07-02 | 0.730 ppt |
| 2021-07-02 | ND |
| 2021-08-06 | 0.600 ppt |
| 2021-08-06 | 0.940 ppt |
| 2021-08-06 | 0.850 ppt |
| 2021-09-10 | 0.950 ppt |
| 2021-09-10 | 0.760 ppt |
| 2021-09-10 | 0.560 ppt |
| 2021-10-29 | 0.850 ppt |
| 2021-10-29 | 1.10 ppt |
| 2021-10-29 | 0.480 ppt |
| 2021-11-05 | 0.950 ppt |
| 2021-11-05 | 0.410 ppt |
| 2021-11-05 | 0.760 ppt |
| 2021-12-03 | ND |
| 2021-12-03 | 0.700 ppt |
| 2021-12-03 | 0.530 ppt |
| 2022-01-13 | 0.570 ppt |
| 2022-01-13 | ND |
| 2022-01-13 | ND |
| 2022-01-13 | 0.390 ppt |
| 2022-01-13 | 0.770 ppt |
| 2022-02-17 | 0.760 ppt |
| 2022-02-17 | ND |
| 2022-02-17 | 0.657 ppt |
| 2022-02-17 | 0.630 ppt |
| 2022-02-17 | ND |
| 2022-03-11 | 0.660 ppt |
| 2022-03-11 | ND |
| 2022-03-11 | 0.460 ppt |
| 2022-04-14 | ND |
| 2022-05-25 | ND |
| 2022-06-09 | ND |
| 2022-07-14 | ND |
| 2022-07-14 | ND |
| 2022-07-14 | ND |
| 2022-08-11 | 0.585 ppt |
| 2022-09-08 | 0.592 ppt |
| 2022-10-13 | 0.847 ppt |
| 2022-10-13 | ND |
| 2022-10-13 | 0.844 ppt |
| 2022-11-10 | 0.728 ppt |
| 2022-12-08 | 0.596 ppt |
| 2023-01-12 | 0.682 ppt |
| 2023-01-12 | 0.767 ppt |
| 2023-01-12 | ND |
| 2023-02-09 | ND |
| 2023-03-09 | ND |
| 2023-04-13 | 0.629 ppt |
| 2023-04-13 | ND |
| 2023-04-13 | ND |
| 2023-05-11 | ND |
| 2023-06-08 | ND |
| 2023-07-13 | 0.723 ppt |
| 2023-07-13 | 0.627 ppt |
| 2023-07-13 | ND |
| 2023-08-10 | 0.681 ppt |
| 2023-09-14 | 0.675 ppt |
| 2023-10-11 | 0.607 ppt |
| 2023-11-09 | 0.607 ppt |
| 2023-11-09 | ND |
| 2023-11-09 | ND |
| 2023-12-14 | ND |