Avon Water Hardness & Quality Report (2026)

Avon, Ohio, in Lorain County on the Lake Erie south shore between Cleveland and Sandusky — a fast-growing Lake Erie communities corridor city with the AvonLake Power Plant and expanding residential development — receives its municipal water from the City of Avon Water Division or through the Lorain County Metropolitan Park District regional supply, drawing from the Black River treatment facility or through Lake Erie-connected Lorain County infrastructure. Avon is one of northeast Ohio's fastest-growing communities.

The very hard 210 mg/L hardness and TDS of 488.8 mg/L reflect the Black River's intensely carbonate drainage basin in Lorain County. The Black River drains the Devonian carbonate platform of northeast Ohio — the Ohio Columbus Limestone, Delaware Limestone, and Berea Sandstone underlain by the Silurian Niagara Dolomite — ancient Devonian and Silurian marine carbonate formations with prolific spring baseflow sustaining consistent carbonate hardness in Lorain County river water. The Black River's carbonate baseflow maintains hard water year-round, and Avon's supply reflects the highly carbonate-enriched Black River or Lake Erie-adjacent supply typical of the Lorain County western Cleveland suburbs.

At 210 mg/L, Avon residents face very hard water — the standard profile for the Lake Erie corridor Lorain County communities. Scale builds rapidly in kettles and coffee machines within weeks, dishwashers require rinse aid or softener treatment, and bathroom fixtures develop heavy calcium deposits. Descaling appliances every four to six weeks is the appropriate cadence. A whole-house water softener is strongly recommended for Lorain County homes. The PFAS level of 8.3 ppt warrants a certified drinking water filter — the Lake Erie south shore industrial corridor between Cleveland and Sandusky, including the Avon Lake Power Plant and the broader Lorain County industrial park network, contributes to elevated PFAS in the supply.