Mains water in West Midlands (England) is supplied by Severn Trent Water (Birmingham, Coventry, Solihull) + South Staffs Water (Black Country); typical hardness: Mixed: Birmingham moderately soft ~43 to 73; Black Country hard ~200 to 270 mg/l CaCO3. Water quality is regulated by the Environment Agency · Ofwat · Drinking Water Inspectorate.
Sources: Severn Trent Water (Birmingham, Coventry, Solihull) + South Staffs Water (Black Country)