In Arkansas, mains water is delivered by local public water systems, regulated by the Arkansas Dept of Health (ADH), Engineering Section under the US EPA Safe Drinking Water Act. Typical hardness: Variable; soft in Ouachita and Ozark surface-water supplies, harder in some limestone and alluvial groundwater. For a specific ZIP, see the EWG Tap Water Database.
Sources: Arkansas Dept of Health (ADH), Engineering Section, EWG Tap Water Database