PFAS Monitoring Results in Woodbury Municipal Wells

A chart outlining PFAS monitoring results for Woodbury municipal wells was completed as of July, 2021.

PFAS Type Amount (Combined Range in All 19 Wells) MDH Health Risk Limit (HRL) MDH Health Based Guideline (HBV) 2016 EPA Guideline
Heptafluorobutyric acid (PFBA) 0.23 to 0.45 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 0.043 ppb
0.035 ppb or 35 ppt
N/A 70 ppt
Perfluorooctanesulfonic acid (PFOS)
Less than 0.006 to 0.032 ppb
0.3 ppb or 300 ppt 0.015 ppb or 15 ppt 70 ppt
Perfluorobutanesulfonic acid (PFBS)
Less than 0.003 to 0.021 ppb (reported below the laboratory reporting limit)
7 ppb or 7,000 ppt 7 ppb or 7,000 ppt
N/A
Perfluoropentanoic Acid (PFPeA), Perfluorohexanoic acid (PFHxA) Less than 0.002 to 0.018 ppb (reported below the laboratory reporting limit) No HRL established N/A N/A
Perfluorohexanesulphonic acid (PFHxS) Less than 0.002 to 0.085 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.