<p>In Alabama, mains water is delivered by local public water systems, regulated by the Alabama Dept of Environmental Management (ADEM), Drinking Water Branch under the US EPA Safe Drinking Water Act. Typical hardness: Mostly soft to moderately soft (state avg ~60 ppm), but hard to very hard in the northern limestone Tennessee Valley (Huntsville). For a specific ZIP, see the EWG Tap Water Database.</p>
Sources: Alabama Dept of Environmental Management (ADEM), Drinking Water Branch, EWG Tap Water Database