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PFAS Monitoring Results in Woodbury's municipal wells

Below is a chart outlining PFAS monitoring results for Woodbury municipal wells completed as of Jan. 21, 2020.

PFAS type

Amount (combined range in all 19 wells)

MDH Health Risk Limit (HRL)

MDH Health Based Guideline (HBV)

2016 EPA Guideline

PFBA

<0.05 to 0.44 parts per billion (ppb)

7 parts per billion (ppb) or 7,000 parts per trillion (ppt)

N.A.

N.A.

PFOA

<0.035 to 0.045 ppb

0.035 ppb or 35 ppt

N.A.

70 ppt

PFOS

<0.015 to 0.033 ppb

0.3 ppb or 300 ppt

0.015 ppb or 15 ppt

70 ppt

PFBS

<0.05-0.015 ppb (reported below the laboratory reporting limit)

7 ppb or 7,000 ppt

2 ppb or 2,000 ppt

N.A.

PFPeA, PFHxA 

<0.05 to 0.016 ppb (reported below the laboratory reporting limit)

No HRL established

N.A.

N.A.

PFHxS

<0.025-0.073 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.

For a general perspective, the City of Woodbury pumped approximately 2.4 billion gallons of water in 2019. 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 2.4 billion (2,400,000,000) gallons of water.

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