Worthington Water Hardness & Quality Report (2026)

Worthington Public Utilities draws drinking water for about 13,000 residents from wells tapping the Quaternary Buried Artesian aquifer and Quaternary Water Table aquifer. These wells, ranging from 44 to 102 feet deep, are located in Nobles County, Minnesota. Treatment occurs at wellhead facilities, involving disinfection and corrosion control, as there are no surface water treatment plants. The supply originates within the Western Corn Belt Plains ecoregion and the Des Moines River watershed, serving the city and surrounding townships.

The groundwater flows through Quaternary-age glacial outwash sands, gravels, and tills. These sediments were derived from the erosion of older Paleozoic bedrock, including Devonian and Ordovician limestones found to the northwest. The presence of limestone and dolomite fragments within these glacial deposits readily dissolves, contributing elevated levels of calcium and magnesium ions. This mineral-rich geology from the region's carbonate rocks is the reason for the water's hard character, with low-permeability clays limiting recharge but concentrating dissolved minerals.

This very hard water can lead to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, which reduces their efficiency and lifespan. Appliances like boilers and fixtures such as showerheads are particularly affected and often require frequent cleaning or replacement. To combat these issues, homeowners can install a whole-house water softener, regularly descale appliances with vinegar, or use scale-inhibiting filters. A softener is strongly recommended to prevent spotting on dishes, dry skin and hair, and plumbing problems. The water meets all Safe Drinking Water Act standards, with a pH of 7.3 and total dissolved solids at 573 mg/L.