Perfluorononanoic acid (PFNA)
Nob Hill Water Association
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 | 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 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 15 | 0 | ND |
| 2024 | ND | 5 | 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 | Lab ID | Result |
|---|---|---|
| 2023-08-14 | 4522960 | ND |
| 2023-08-14 | 4522955 | ND |
| 2023-08-14 | 4522961 | ND |
| 2023-08-14 | 4522952 | ND |
| 2023-08-14 | 4522958 | ND |
| 2023-08-14 | 4522953 | ND |
| 2023-08-14 | 4522954 | ND |
| 2023-08-14 | 4522957 | ND |
| 2023-08-14 | 4522956 | ND |
| 2023-08-14 | 4522959 | ND |
| 2023-10-02 | 4531492 | ND |
| 2023-10-02 | 4531496 | ND |
| 2023-10-02 | 4531493 | ND |
| 2023-10-02 | 4531491 | ND |
| 2023-10-04 | WDJ0366-01 | ND |
| 2024-02-08 | YEB0212-01 | ND |
| 2024-02-08 | YEB0212-02 | ND |
| 2024-06-18 | YEF0463-01 | ND |
| 2024-06-18 | YEF0462-01 | ND |
| 2024-06-18 | YEF0461-01 | ND |