Are there PFAS in our drinking water?

Our most recent testing for PFAS in drinking water occurred in March of 2024 for the Greater Portland Water System.

Regulated PFAS Compound EPA Maximum Contaminant Level Test Results Meets Standard EPA Reporting Limit
PFOA 4 ppt ND Yes 4
PFOS 4 ppt ND Yes 4
PFHxS 10 ppt ND Yes 3
PFNA 10 ppt ND Yes 4
HFPO-DA 10 ppt ND Yes 5
PFHxS Hazard Index <1.0 0 Yes 0

ND – Below detection Limit

In August 2022, twenty-five compounds were tested and none were detected.

PFAS Name Greater Portland (Sebago Lake)  Steep Falls (Groundwater)
Hexafluoropropylene oxidedimer acid (GenX) ND ND
Perfluorobutanesulfonic acid ND ND
Perfluorodecanoic acid ND ND
Perfluorododecanoic acid ND ND
Perfluorpoheptanoic acid ND ND
Perfluorohexanesulfonic acid ND ND
Perfluorhexanoic acid ND ND
Perfluorononanoic acid ND ND
Perfluoroctanesulfonic acid (PFOS) ND ND
Perfluorooctanoic acid (PFOA) ND ND
Perfluoroundecanoic acid ND ND
11-chloroeicosafluoro-3-oxaundecane-1sulfonic acid ND ND
9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid ND ND
4, 8-dioxa-3H-perfluorononanoic acid ND ND
Perfluorobutanoic acid ND ND
Perfluoropentanoic acid ND ND
1H, 1H, 2H, 2H-perfluorohexane sulfonate ND ND
Perfluoropentanesulfonic acid ND ND
Perfluoroheptanesulfonic acid ND ND
1H, 1H, 2H, 2H-perfluorooctane sulfonate ND ND
1H, 1H, 2H, 2H-perfluorodecane sulfonate ND ND
Nonafluoro-3, 6-dioxaheptanoic acid ND ND
Perfluoro(2-ethoxyethane)sulfonic acid ND ND
Perfluoro-3-methoxypropanoic acid ND ND
Perfluoro-4-methoxybutanoic acid ND ND

Units = parts per trillion, ppt

ND = Not Detected  (< 2 ppt)

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