Maine Water Quality
Drinking water data for all 16 counties.
Avg Water Score
30.1
State Grade
F
Counties with Data
16
of 16 total
All Maine Counties
| County | Water Score |
|---|---|
| Sagadahoc County | 86.0 |
| York County | 49.6 |
| Penobscot County | 45.6 |
| Kennebec County | 44.1 |
| Cumberland County | 43.3 |
| Androscoggin County | 38.5 |
| Lincoln County | 36.4 |
| Oxford County | 35.2 |
| Knox County | 20.8 |
| Somerset County | 16.7 |
| Aroostook County | 15.0 |
| Franklin County | 12.5 |
| Piscataquis County | 11.6 |
| Waldo County | 10.3 |
| Washington County | 8.1 |
| Hancock County | 8.0 |
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Frequently Asked Questions
Which county in Maine has the best water quality?
Sagadahoc County has the highest water quality score in Maine at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Maine has the most water violations?
Hancock County has among the lowest water quality scores in Maine at 8.0/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Maine?
Maine has an average water quality score of 30.1/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Maine water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.