Richland Water Hardness & Quality Report (2026)

The City of Richland Water Utility serves approximately 18,280 residents in Richland, Washington, in Benton County along the Columbia River in the Tri-Cities area. Water is sourced from five city groundwater wells ranging in depth from 250 to 1,200 feet, supplemented by an inter-tie booster pump station connected to the City of Richland. The system has a total pumping capacity of up to 7,305 gallons per minute. No surface water reservoirs are primary sources; treatment involves standard groundwater disinfection and monitoring, with the utility maintaining a low unaccounted-for water loss rate of 8.5% over a three-year average.

The groundwater originates from the Columbia Basin aquifer system — specifically the Wanapum Basalt Aquifer within the Miocene-era Columbia River Basalt Group, overlain by Quaternary sands and gravels. Local recharge comes from precipitation and river underflow from the nearby Columbia River, flowing through fractured basalt flows and sedimentary layers of the Ellensburg Formation. Volcanic rocks and alluvial sediments release calcium and magnesium ions during infiltration, creating moderately mineralised to hard groundwater typical of the region's basalt-dominated hydrogeology.

At this hard level, scale buildup is significant — reducing efficiency in water heaters, dishwashers, and washing machines while leaving spots on glassware and fixtures. Laundry may feel stiff and soap lathering is poor, often requiring more detergent. City tests show TDS ranging 212–505 mg/L, with iron ranging from none detected to 0.10 mg/L; 2024 tap water meets all EPA primary standards. A water softener is recommended for homes to prevent pipe clogging, extend appliance life, and improve skin and hair condition. Regular maintenance such as deliming heaters and using rinse aids helps until whole-home treatment is installed. Compliance is affirmed for all regulated parameters, and groundwater treatment includes disinfection.