<p>In Tennessee, mains water is delivered by local public water systems, regulated by the Tennessee Dept of Environment and Conservation (TDEC), Division of Water Resources under the US EPA Safe Drinking Water Act. Typical hardness: Variable; hard in the limestone Central Basin (Nashville area), softer in the eastern Appalachian mountains. For a specific ZIP, see the EWG Tap Water Database.</p>
Sources: Tennessee Dept of Environment and Conservation (TDEC), Division of Water Resources, EWG Tap Water Database