Ottumwa Water Hardness & Quality Report (2026)

Ottumwa Water & Hydro (also referenced as Ottumwa Water Works) serves the city of Ottumwa in Wapello County, Iowa, providing drinking water to all residents and businesses. The utility sources its supply from two primary surface water sources: the Des Moines River and the Ottumwa Reservoir. Water is treated at utility-maintained facilities to ensure adequate quality, quantity, and pressure throughout the service area. The utility is located at 230 Turner Drive, Ottumwa, IA 52501, phone (641) 684-4606; Consumer Confidence Reports are available through iowaccr.org.

The Des Moines River watershed drains a large portion of central Iowa, with Ottumwa's intake in the lower river reaches. Local geology features Mississippian-age limestone and dolomite formations — including the Burlington-Keokuk group — which weather to release calcium and magnesium into the river. The Ottumwa Reservoir, a man-made impoundment, captures runoff from surrounding Pennsylvanian shales, sandstones, and glacial deposits. This geology imparts a hard character to the water through high concentrations of dissolved calcium and magnesium from carbonate dissolution, typical of this limestone-dominated region in southeastern Iowa.

Hard water in Ottumwa leads to scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Soap lathering is poorer, increasing detergent use, and spots may appear on glassware and fixtures. Regular maintenance including deliming appliances and flushing water heaters is advised. A water softener is recommended to mitigate these effects and protect plumbing. Consumer Confidence Reports confirm compliance with EPA drinking water standards; treatment includes coagulation, filtration, and disinfection. Full quality details including pH, lead, copper, and PFAS data are available through iowaccr.org or by contacting Ottumwa Water & Hydro directly.