Perfluorononanoic acid (PFNA)
Johnston Municipal Water Supply
NOTE: Johnston Municipal Water Supply purchases water from Des Moines Water Works which is required to test for perfluorononanoic acid (pfna). Sample information shown below was taken by Des Moines Water Works.
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 | 3 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 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 |
ppt = parts per trillion
State and national drinking water standards and health guidelines
EWG Health Guideline 1 ppt
The EWG Health Guideline of 1 ppt for perfluorononanoic acid was defined by EWG based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline applies to the entire class of PFAS detected in water.
EPA Maximum Contaminant
Level (MCL) 10 ppt
ppt = parts per trillion
All test results
NOTE: Johnston Municipal Water Supply purchases water from Des Moines Water Works which is required to test for perfluorononanoic acid (pfna). Sample information shown below was taken by Des Moines Water Works.
| Date | Lab ID | Result |
|---|---|---|
| 2014-07-30 | 180955 | ND |
| 2014-07-30 | 180953 | ND |
| 2014-07-30 | 180959 | ND |
| 2015-01-26 | 211478 | ND |
| 2015-01-26 | 211497 | ND |
| 2015-01-26 | 211477 | ND |
| 2015-01-27 | 211684 | ND |
| 2015-01-27 | 211692 | ND |
| 2015-01-27 | 211691 | ND |
| 2015-04-01 | 226435 | ND |
| 2015-04-01 | 226530 | ND |
| 2015-04-01 | 226431 | ND |