In Louisiana, mains water is delivered by local public water systems, regulated by the Louisiana Dept of Health (LDH), Safe Drinking Water Program under the US EPA Safe Drinking Water Act. Typical hardness: Variable; largely soft to moderately hard, softer in the southern alluvial / Gulf areas. For a specific ZIP, see the EWG Tap Water Database.
Sources: Louisiana Dept of Health (LDH), Safe Drinking Water Program, EWG Tap Water Database