<p>In Nebraska, mains water is delivered by local public water systems, regulated by the Nebraska Dept of Water, Energy and Environment (DWEE) under the US EPA Safe Drinking Water Act. Typical hardness: Hard; groundwater high in calcium / magnesium, Omaha ~188 ppm. For a specific ZIP, see the EWG Tap Water Database.</p>
Sources: Nebraska Dept of Water, Energy and Environment (DWEE), EWG Tap Water Database