In Wyoming, mains water is delivered by local public water systems, regulated by the US EPA Region 8 (Wyoming has no SDWA primacy) under the US EPA Safe Drinking Water Act. Typical hardness: Generally moderately hard to hard, varies by source. For a specific ZIP, see the EWG Tap Water Database.
Sources: US EPA Region 8 (Wyoming has no SDWA primacy), EWG Tap Water Database