Mains water in Essex (England) is supplied by Essex & Suffolk Water (most); Affinity Water (west/Tendring); Anglian & Thames on fringes; typical hardness: Hard to very hard, ~220 to 280 mg/l CaCO3. Water quality is regulated by the Environment Agency · Ofwat · Drinking Water Inspectorate.
Sources: Essex & Suffolk Water (most); Affinity Water (west/Tendring); Anglian & Thames on fringes