Speedway Water Hardness & Quality Report (2026)

Speedway Water Works supplies about 12,000 residents in the Town of Speedway, an Indianapolis suburb. Their water comes from a mix of sources. Surface water, treated at a conventional filtration plant, is supplemented by groundwater drawn during colder months. While specific reservoirs or aquifers aren't named, the surface supply is linked to central Indiana rivers, generally within the White River basin. This area's landscape is a mix of farms and urban development, with underlying geology that's predominantly limestone.

The region's geology is marked by Pleistocene glacial deposits sitting atop Mississippian-age limestone and dolomite. Formations like the Salem and St. Louis Limestones are particularly rich in calcium and magnesium. As water interacts with these carbonate rocks, these minerals dissolve, making the supply hard. Groundwater from deeper layers often shows higher hardness due to longer contact with these mineral-rich strata, while surface water picks up some minerals from drainage over similar limestone terrains.

Homeowners in Speedway will likely notice scale buildup on pipes, water heaters, dishwashers, and washing machines. This buildup can reduce the efficiency and lifespan of these appliances, especially those that use hot water. Regular cleaning of fixtures like showerheads with vinegar can help manage scale, as can annual flushing of water heaters. Given the hardness of the supply, installing a water softener is highly recommended to protect appliances, improve how soap lathers, and prevent staining on sinks and tubs. Speedway Water Works reports that its water meets all EPA health standards, with no violations and low lead levels.