The City of Woodbury regularly monitors the water quality of each of the wells for contaminants, including PFAS, based on state and federal regulations. Results from this monitoring can be found in the most recent Water Quality Report.
The city recognizes the importance of treating all wells for PFAS in the future, regardless of PFAS levels. Currently, nine of the 19 wells exceed the Minnesota Department of Health health risk index for PFAS. Six of those wells are being treated at the temporary Water Treatment Plant to appropriate standards while the other three wells are offline. The city will continue to regularly monitor PFAS levels at each of the 19 wells, as well as monitor changes in state and federal regulations.
Monitoring Results
(Includes all wells in operation, with and without treatment)
Updated June 2023
| PFAS Type | Amount (Combined Range in wells in operation) | MDH Health Risk Limit | MDH Health Based Guideline | EPA Guideline |
|---|
| Heptafluorobutyric acid (PFBA) | 140 to 440 parts per trillion (ppt) | 7,000 parts per trillion (ppt) | N/A | N/A |
| Perlfuorooctanic acid (PFOA) | Less than 1.7 to 46 ppt | 35 ppt | N/A | 4 ppt |
| Perfluorooctanesulfonic acid (PFOS) | Less than 1.7 to 30 ppt | 300 ppt | 15 ppt | 4 ppt |
| Perfluorobutanesulfonic acid (PFBS) | Less than 1.9 to 5.0 ppt | 7,000 ppt | 100 ppt | 2,000 ppt |
| Perfluoropentanoic acid (PFPeA) | 3.2 to 16.0 ppt | Not established | N/A | N/A |
| Perfluorohexanoic acid (PFHxA) | Less than 1.9 to 15 ppt
| Not established | 200 ppt | N/A |
| Perluorohexanesulphonic acid (PFHxS) | 1.8 to 12 ppt | Not established | 47 ppt | N/A |
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