Perfluorononanoic acid (PFNA)
San Antonio Water Company
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 | ND | 9 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2019-06-11 | CA3610085_003_003-201906110854 | ND |
| 2019-06-11 | CA3610085_004_004-201906110836 | ND |
| 2019-06-11 | CA3610085_011_011-201906110842 | ND |
| 2019-09-03 | CA3610085_003_003-201909030939 | ND |
| 2019-09-03 | CA3610085_004_004-201909030946 | ND |
| 2019-09-03 | CA3610085_011_011-201909030950 | ND |
| 2019-12-11 | CA3610085_003_003-201912111030 | ND |
| 2019-12-11 | CA3610085_011_011-201912111037 | ND |
| 2019-12-11 | CA3610085_004_004-201912111040 | ND |
| 2020-03-03 | CA3610085_003_003-202003031000 | ND |
| 2020-03-03 | CA3610085_004_004-202003030950 | ND |
| 2020-03-03 | CA3610085_011_011-202003031020 | ND |
| 2022-11-29 | CA3610085_021_021-202211290922 | ND |
| 2023-04-20 | CA3610085_021_021-202304201200 | ND |
| 2023-07-11 | CA3610085_021_021-202307111200 | ND |
| 2023-10-17 | CA3610085_021_021-202310171045 | ND |