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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 PFNA HFPO-DA PFBS |
Hazard Index <1.0 | 0 | Yes | 0 |
ND – Below detection Limit
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In August 2022, twenty-five compounds were tested and none were detected.
| PFAS Name | Greater Portland (Sebago Lake) | Â 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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