Maine Water Quality Report 2026
Maine tap water is safe to drink based on our analysis of 4 water systems serving 162,568 residents. The average PurityMap score is 85.0/100 (Grade: A), which is 7.1 points above the national average.
- No major contaminant flags across Maine cities. All cities meet EPA federal drinking water standards.
Maine water is generally good quality. A carbon pitcher or faucet filter removes chlorine taste and provides extra protection. No major filtration investment is needed for most residents.
Soft
Maine is 7.1 points above the US average of 77.9/100. Hardness is 5.6 GPG below the US average of 6.3 GPG.
All 4 cities score similarly
How Maine's 4 cities score on the PurityMap 0–100 scale:
Water quality for the most populated cities. Click any city for details.
| City | Population | Score | Hardness | Key Issues |
|---|---|---|---|---|
| Portland | 68K | 85/100 | 0.8 GPG | — |
| Lewiston | 37K | 85/100 | 0.6 GPG | — |
| Bangor | 32K | 85/100 | 0.5 GPG | — |
| South Portland | 26K | 85/100 | 0.8 GPG | — |
Maine generally has soft to moderate water. Average: 0.7 GPG (Soft). Most residents do not need a softener.
Based on EPA UCMR5 data, PFAS have not been detected above advisory levels in any Maine cities in our database as of 2026.
All Maine cities have lead below 5 ppb. Average: 0.9 ppb. Individual homes with older plumbing may have higher levels.
Where Maine gets its drinking water, based on 4 water systems.
| Source Type | Cities | % of Total |
|---|---|---|
| Surface Water | 4 | 100% |
Maine water is generally good. A carbon pitcher filter improves taste.
| # | City | Pop. | Score | Hardness | Lead | PFAS | TDS |
|---|---|---|---|---|---|---|---|
| 1 | Portland | 68K | 85/100 | 0.8 GPG (Soft) | 1.0 ppb | ✅ No | 25 ppm |
| 2 | Lewiston | 37K | 85/100 | 0.6 GPG (Soft) | 0.8 ppb | ✅ No | 20 ppm |
| 3 | Bangor | 32K | 85/100 | 0.5 GPG (Soft) | 0.8 ppb | ✅ No | 18 ppm |
| 4 | South Portland | 26K | 85/100 | 0.8 GPG (Soft) | 1.0 ppb | ✅ No | 25 ppm |
Maine has 3 utilities. Major: Portland Water District, Lewiston and Auburn Water Pollution Control Authority, Bangor Water District.
Sources: Sebago Lake, Lake Auburn, Floods Pond.
- EPA Safe Drinking Water Information System
- EWG Tap Water Database
- State utility Consumer Confidence Reports
- USGS regional water monitoring data
PurityMap compiles publicly available data and does not perform independent testing.
4 city water quality reports available for Maine.
Lewiston Water Quality Report
Portland Water Quality Report
South Portland Water Quality Report
Compare water quality reports across all 50 US states