Mains water in Staffordshire (England) is supplied by South Staffs Water (south); Severn Trent Water (north/mid incl. Stoke); typical hardness: Hard, ~200 to 280 mg/l CaCO3. Water quality is regulated by the Environment Agency · Ofwat · Drinking Water Inspectorate.
Sources: South Staffs Water (south); Severn Trent Water (north/mid incl. Stoke)