London Water Hardness & Quality Report (2026)

The Mid-Ohio Regional Water and Sewer District supplies drinking water to the City of London and nearby areas in Madison County. This utility draws from a mixed water source, utilizing both surface water from the Mad River watershed and groundwater aquifers beneath central Ohio. Their treatment facilities process this raw water to meet stringent federal and state drinking water standards, as documented in their annual Consumer Confidence Reports. The Mid-Ohio WSD ensures the water delivered to residents is safe and compliant with the Safe Drinking Water Act.

The bedrock geology beneath London is characterized by Ordovician and Silurian limestone and dolomite formations. These ancient marine carbonate rocks, laid down during the Paleozoic Era, are highly soluble. As groundwater naturally percolates through these rock layers, it picks up significant amounts of calcium and magnesium minerals. This geological process is common across central Ohio and is the primary reason for the region's consistently hard water supply, which is classified as very hard.

Homeowners in London will likely notice mineral scale building up on faucets, showerheads, and inside pipes and water heaters due to this very hard water. Appliances like dishwashers and washing machines may become less efficient and have a shorter lifespan because of scale accumulation. You might also find that soaps and detergents don't lather as well, and laundry comes out feeling stiff. To combat these issues and protect your plumbing, installing a whole-house water softener is a highly recommended solution. The Mid-Ohio WSD provides detailed water quality data and CCRs upon request.