Perfluorononanoic acid (PFNA)
Littleton 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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 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 | 0.0430 ppt | 18 | 1 | ND - 0.780 ppt |
| 2020 | 0.516 ppt | 18 | 13 | ND - 0.870 ppt |
| 2021 | 0.627 ppt | 39 | 30 | ND - 1.13 ppt |
| 2022 | 0.479 ppt | 51 | 26 | ND - 1.27 ppt |
| 2023 | 0.511 ppt | 37 | 20 | ND - 1.54 ppt |
| 2024 | ND | 1 | 0 | ND |
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 |
|---|---|
| 2019-06-19 | ND |
| 2019-06-19 | ND |
| 2019-06-19 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-09-23 | ND |
| 2019-09-23 | ND |
| 2019-09-23 | ND |
| 2019-11-18 | ND |
| 2019-12-09 | ND |
| 2019-12-09 | 0.780 ppt |
| 2019-12-09 | ND |
| 2020-07-28 | ND |
| 2020-07-28 | 0.760 ppt |
| 2020-07-28 | ND |
| 2020-10-15 | 0.608 ppt |
| 2020-10-15 | ND |
| 2020-10-15 | 0.781 ppt |
| 2020-10-15 | 0.520 ppt |
| 2020-10-15 | ND |
| 2020-10-15 | ND |
| 2020-10-15 | 0.870 ppt |
| 2020-10-15 | 0.837 ppt |
| 2020-11-04 | 0.747 ppt |
| 2020-11-04 | 0.818 ppt |
| 2020-11-04 | 0.719 ppt |
| 2020-11-04 | 0.747 ppt |
| 2020-12-02 | 0.724 ppt |
| 2020-12-02 | 0.528 ppt |
| 2020-12-02 | 0.627 ppt |
| 2021-01-12 | 0.854 ppt |
| 2021-01-12 | 0.745 ppt |
| 2021-01-12 | 0.608 ppt |
| 2021-02-08 | 1.04 ppt |
| 2021-02-08 | 0.519 ppt |
| 2021-02-08 | 0.573 ppt |
| 2021-03-17 | 1.13 ppt |
| 2021-03-17 | 1.000 ppt |
| 2021-03-17 | 1.000 ppt |
| 2021-03-17 | 1.13 ppt |
| 2021-03-17 | 0.864 ppt |
| 2021-03-17 | 0.864 ppt |
| 2021-04-05 | 0.786 ppt |
| 2021-04-05 | 0.810 ppt |
| 2021-04-05 | 0.642 ppt |
| 2021-05-12 | 0.713 ppt |
| 2021-05-12 | ND |
| 2021-05-12 | ND |
| 2021-06-08 | 0.831 ppt |
| 2021-06-08 | ND |
| 2021-06-08 | 0.936 ppt |
| 2021-07-21 | ND |
| 2021-07-21 | ND |
| 2021-07-21 | 0.700 ppt |
| 2021-09-08 | 0.669 ppt |
| 2021-09-08 | 0.783 ppt |
| 2021-09-08 | 0.922 ppt |
| 2021-10-06 | 0.908 ppt |
| 2021-10-06 | 0.699 ppt |
| 2021-10-06 | 0.613 ppt |
| 2021-10-13 | 0.849 ppt |
| 2021-10-21 | ND |
| 2021-10-28 | ND |
| 2021-11-15 | 0.811 ppt |
| 2021-11-15 | 0.722 ppt |
| 2021-11-15 | 0.974 ppt |
| 2021-12-14 | ND |
| 2021-12-14 | 0.739 ppt |
| 2021-12-14 | ND |
| 2022-01-11 | 0.922 ppt |
| 2022-01-11 | 0.717 ppt |
| 2022-01-11 | ND |
| 2022-01-18 | ND |
| 2022-02-16 | ND |
| 2022-02-16 | 0.930 ppt |
| 2022-02-16 | 0.702 ppt |
| 2022-03-16 | 1.03 ppt |
| 2022-03-16 | ND |
| 2022-03-16 | 0.809 ppt |
| 2022-04-20 | 1.27 ppt |
| 2022-04-20 | 1.25 ppt |
| 2022-04-25 | ND |
| 2022-04-27 | 0.648 ppt |
| 2022-05-16 | 1.13 ppt |
| 2022-05-16 | 0.924 ppt |
| 2022-05-18 | ND |
| 2022-05-18 | ND |
| 2022-05-18 | ND |
| 2022-06-22 | 0.809 ppt |
| 2022-06-22 | ND |
| 2022-06-22 | 0.845 ppt |
| 2022-06-22 | ND |
| 2022-07-13 | ND |
| 2022-07-13 | ND |
| 2022-07-13 | 0.837 ppt |
| 2022-07-13 | 1.08 ppt |
| 2022-07-13 | ND |
| 2022-07-13 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | 0.967 ppt |
| 2022-08-03 | 0.770 ppt |
| 2022-09-26 | 1.06 ppt |
| 2022-09-26 | 1.05 ppt |
| 2022-09-27 | ND |
| 2022-09-27 | ND |
| 2022-10-19 | 0.935 ppt |
| 2022-10-19 | 1.18 ppt |
| 2022-10-19 | 0.990 ppt |
| 2022-10-27 | ND |
| 2022-10-27 | ND |
| 2022-10-27 | ND |
| 2022-11-07 | 0.886 ppt |
| 2022-11-07 | 0.961 ppt |
| 2022-11-09 | ND |
| 2022-11-09 | ND |
| 2022-12-20 | ND |
| 2022-12-20 | 0.781 ppt |
| 2022-12-20 | 0.939 ppt |
| 2022-12-20 | ND |
| 2023-01-03 | 1.03 ppt |
| 2023-01-03 | 0.937 ppt |
| 2023-01-24 | ND |
| 2023-01-24 | ND |
| 2023-01-24 | ND |
| 2023-01-24 | 0.715 ppt |
| 2023-02-01 | ND |
| 2023-02-01 | 0.833 ppt |
| 2023-03-07 | ND |
| 2023-03-07 | 0.672 ppt |
| 2023-04-18 | ND |
| 2023-04-18 | ND |
| 2023-04-18 | ND |
| 2023-04-18 | ND |
| 2023-05-17 | 0.834 ppt |
| 2023-05-17 | 1.13 ppt |
| 2023-05-17 | ND |
| 2023-06-16 | 0.765 ppt |
| 2023-06-16 | ND |
| 2023-07-25 | ND |
| 2023-07-25 | 1.20 ppt |
| 2023-07-25 | ND |
| 2023-07-25 | ND |
| 2023-07-25 | 0.909 ppt |
| 2023-07-25 | 0.632 ppt |
| 2023-08-21 | 1.08 ppt |
| 2023-08-21 | ND |
| 2023-09-19 | 1.54 ppt |
| 2023-09-19 | 1.06 ppt |
| 2023-10-03 | 0.656 ppt |
| 2023-10-03 | 0.988 ppt |
| 2023-10-03 | 1.16 ppt |
| 2023-10-12 | 0.940 ppt |
| 2023-11-28 | 0.857 ppt |
| 2023-11-28 | 0.974 ppt |
| 2023-11-28 | ND |
| 2023-12-19 | ND |
| 2024-07-17 | ND |