Bentonville Water Hardness & Quality Report (2026)

Bentonville Water Utilities serves approximately 47,195 people in Bentonville, Arkansas, and surrounding areas in Benton County. The utility sources all its drinking water from Beaver Water District (BWD), which treats raw water from Beaver Lake, a reservoir on the White River created by Beaver Dam in 1966. BWD operates the primary treatment plant serving Northwest Arkansas communities including Fayetteville, Springdale, Rogers, and Bentonville, using conventional processes of coagulation, sedimentation, filtration, and chlorine disinfection. In 2022, Bentonville collected 912 water samples as part of routine monitoring, with reports available via the Arkansas Department of Health.

The Beaver Lake watershed spans over 1,000 square miles in the Ozark highlands of northwest Arkansas and southwest Missouri, primarily the Boston Mountains ecoregion. Underlying geology features Mississippian limestones — including the Boone Chert and St. Joe Limestone — and sandstones, which weather to release calcium and magnesium ions into surface runoff and lake waters. This karst terrain promotes mineral dissolution, yielding a moderately mineralised character shaped by these ancient carbonate formations, with minor nutrient loading from agricultural and urban land uses in the basin.

As moderately hard water, Bentonville's supply promotes moderate scale buildup in pipes, water heaters, and dishwashers, potentially reducing efficiency over time. Washing machines and faucets are also affected, with limescale trapping sediment and increasing energy use. Regular vinegar descaling, scale-inhibiting filters, or annual professional maintenance helps mitigate issues; a water softener is recommended for households noticing reduced soap lathering, dry skin, or spotting. Water quality meets EPA legal limits with zero MCL violations; two contaminants exceed health guidelines including bromodichloromethane, for which certified filters are advised for vulnerable groups.