Maine Tap Water Quality
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Overview
Portland's Sebago Lake supply is so clean it holds one of the EPA's rare filtration waivers: the protected watershed delivers water needing only disinfection. Maine's other surface-water systems are similarly well-sourced for the most part.
Maine's real water issue is underground: it has among the nation's highest rates of arsenic in private wells, with roughly half the state on unregulated wells drilled into arsenic-bearing bedrock. PFAS from decades of sludge-spreading on farmland has also emerged as a statewide crisis, with Maine setting some of the country's strictest standards and testing programs.
Common Contaminants in Maine
Bedrock wells across large swaths of Maine exceed the arsenic limit; an estimated one in ten wells is affected and testing rates remain low
Land-applied biosolids contaminated farms and wells statewide; Maine banned sludge spreading and funds well testing and treatment
Occasional exceedances in small systems with organic-rich sources
Violations & Compliance
Public systems have strong compliance, anchored by Sebago Lake's waiver-grade quality. The state's attention is on private wells (arsenic, PFAS), which fall outside federal regulation and depend on homeowner testing.
City Reports for Maine
We haven't published individual city water reports for Maine yet. Use the ZIP lookup for a statewide assessment, and check your utility's annual Consumer Confidence Report for local detail.
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •US EPA Safe Drinking Water Act regulations
- •EWG Tap Water Database
- •The utility's most recent Consumer Confidence Report (CCR)
- •WHO Guidelines for Drinking-water Quality