<p>In Missouri, mains water is delivered by local public water systems, regulated by the Missouri Dept of Natural Resources (DNR), Public Drinking Water Branch under the US EPA Safe Drinking Water Act. Typical hardness: Variable, moderately hard to very hard; limestone areas (central / southern) harder. For a specific ZIP, see the EWG Tap Water Database.</p>
Sources: Missouri Dept of Natural Resources (DNR), Public Drinking Water Branch, EWG Tap Water Database