Mains water in Cambridgeshire (England) is supplied by Cambridge Water (Cambridge & South Cambs); Anglian Water (Peterborough, Fenland, Huntingdonshire); typical hardness: Very hard, ~300 to 330 mg/l CaCO3. Water quality is regulated by the Environment Agency · Ofwat · Drinking Water Inspectorate.
Sources: Cambridge Water (Cambridge & South Cambs); Anglian Water (Peterborough, Fenland, Huntingdonshire)