Maine Water Quality Report
Tap water quality data for 11 cities in Maine, updated 2026.
US average: 100 ppm
10 of 11 cities violation-free
11 cities tested
11 water systems tracked
Cleanest Tap Water in Maine
Cities with the fewest water quality issues
Standish
136K served
Gorham
136K served
Scarborough
135K served
Cape Elizabeth
135K served
Cumberland
135K served
Falmouth
135K served
Portland
135K served
South Portland
135K served
Westbrook
135K served
Windham
135K served
Most Water Quality Issues in Maine
Cities with the most violations and concerns
Water Hardness Across Maine
Not sure what your hardness means? Use our Water Hardness Calculator or find the best hardness test kits.
Maine Tap Water: What You Need to Know
Maine has 11 tracked water utilities serving approximately 1.5M residents. The average water hardness is 36 ppm (2.1 GPG), classified as Soft — below the national average of 100 ppm. Hardness ranges from 35.7 ppm in Windham to 35.7 ppm in Windham.
In the past 3 years, 1 of 11 cities in Maine have recorded water quality violations, totaling 26 violations (26 health-based). All 11 tested cities have lead levels below the EPA action level of 15 ppb.
Frequently Asked Questions About Maine Water
Is tap water safe to drink in Maine?
Most tap water in Maine meets EPA standards, but 1 cities have recorded violations in the past 3 years (26 health-based). We recommend checking your specific city's report on TapWater.org and considering a home water test.
How hard is the water in Maine?
Maine's average water hardness is 36 ppm (2.1 GPG), classified as Soft. This is below the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.
Which city in Maine has the cleanest tap water?
Based on EPA violation data, lead testing, and water quality metrics, Standish ranks as having the cleanest tap water in Maine. It has zero violations in the past 3 years and lead levels well below the EPA action level.
Which city in Maine has the most water quality issues?
Raymond currently has the most water quality concerns in Maine, with 26 violations in the past 3 years. Residents should check their city's detailed water quality report and consider using a certified water filter.
Where does Maine get its water from?
The majority of Maine's water systems (64%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.
All 11 Cities
Sorted by population served
Standish
Utility serves 136K
Gorham
Utility serves 136K
Scarborough
Utility serves 135K
Raymond
Utility serves 135K
Cape Elizabeth
Utility serves 135K
Cumberland
Utility serves 135K
Falmouth
Utility serves 135K
Portland
Utility serves 135K
South Portland
Utility serves 135K
Westbrook
Utility serves 135K
Windham
Utility serves 135K