Perfluorononanoic acid (PFNA)
California Water Service Company Oak Hills
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 3 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 9 | 0 | ND |
| 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 | Lab ID | Result |
|---|---|---|
| 2020-05-04 | CA2710019_008_008-202005041030 | ND |
| 2020-05-07 | CA2710019_001_001-202005071005 | ND |
| 2020-08-06 | CA2710019_003_003-202008061210 | ND |
| 2023-05-22 | 103699P | ND |
| 2023-05-22 | 103700P | ND |
| 2023-11-07 | CA2710019_003_003-202311071424 | ND |
| 2023-11-07 | CA2710019_008_008-202311071403 | ND |
| 2023-11-15 | CA2710019_003_003-202311151018 | ND |
| 2023-11-15 | CA2710019_008_008-202311151034 | ND |
| 2023-11-21 | CA2710019_001_001-202311211308 | ND |
| 2023-11-21 | CA2710019_001_001-202311211309 | ND |
| 2023-12-18 | 110232P | ND |
| 2024-01-22 | 112719R | ND |