In Maine, mains water is delivered by local public water systems, regulated by the Maine CDC Drinking Water Program (Maine DHHS) under the US EPA Safe Drinking Water Act. Typical hardness: Predominantly soft (New England granitic bedrock); some bedrock wells moderately hard. For a specific ZIP, see the EWG Tap Water Database.
Sources: Maine CDC Drinking Water Program (Maine DHHS), EWG Tap Water Database