PFAS Monitoring Results in Woodbury Municipal Wells

A chart outlining PFAS monitoring results for Woodbury municipal wells was completed as of February, 2022.

PFAS Type Amount (Combined Range in All 19 Wells) MDH Health Risk Limit (HRL) MDH Health Based Guideline (HBV)  EPA Guideline
Heptafluorobutyric acid (PFBA) 0.23 to 0.43 Parts Per Billion (PPB) 7 Parts Per Billion (PPB) or 7,000 parts per trillion (PPT) N/A N/A
Perfluorooctanoic acid (PFOA) Less than 0.003 to 0.042 ppb
0.035 ppb or 35 ppt
 N/A 0.004 ppt
Perfluorooctanesulfonic acid (PFOS)
Less than 0.0024 to 0.03 ppb
 0.3 ppb or 300 ppt 0.015 ppb or 15 ppt 0.02 ppt
Perfluorobutanesulfonic acid (PFBS)
Less than 0.0018 to 0.015 ppb (reported below the laboratory reporting limit)
 7 ppb or 7,000 ppt 0.1 ppb or 100 ppt
2,000 ppt
Perfluoropentanoic Acid (PFPeA) Less than 0.002 to 0.016 ppb (reported below the laboratory reporting limit) No HRL established N/A N/A
Perfluorohexanoic acid (PFHxA) 0.002 to 0.016 ppb No HRL established 0.2 ppb or 200 ppt
N/A
Perfluorohexanesulphonic acid (PFHxS) Less than 0.0017 to 0.069 ppb No HRL established 0.047 ppb or 47 ppt N/A

"Parts per billion" means the number of units of the chemical, in its pure form, found in every billion units of water.

"Parts per trillion" means the number of units of the chemical, in its pure form, found in every trillion units of water.

From a general perspective, the City of Woodbury pumped approximately 2.6 billion gallons of water in 2020. That means a PFAS detected at a level of 0.025 ppb (parts per billion) would equal about an 8-ounce cup (or 0.06 gallons) of the substance in 2.6 billion (2,600,000,000) gallons of water.