Keene Water Hardness & Quality Report (2026)

The Keene Water Department, operating under the City of Keene, New Hampshire, serves approximately 25,387 residents in Cheshire County. Water is sourced from surface water reserves in the Ashuelot River watershed, including local reservoirs in the Monadnock Region. Treatment occurs at the municipal facility located at 3 Washington Street, Keene, NH 03431 (contact: 603-352-0133). The system delivers potable water compliant with federal standards, as detailed in annual quality reports; the 2023 Water Quality Report covers 2022 testing data and is publicly available.

Keene's supply originates in the Ashuelot River watershed, spanning the Monadnock Region's upland terrain. Underlying geology consists of ancient metamorphic schists and gneisses from the Devonian period, interspersed with granitic intrusions and capped by Quaternary glacial deposits. This non-carbonate crystalline bedrock yields very soft water with low mineral content, as precipitation percolates rapidly through fractured rock without extracting significant dissolved solids from limestones or dolomites. The soft character reflects minimal geological buffering, typical of New England shield areas.

Soft water in Keene minimizes scale buildup on fixtures, pipes, and appliances such as dishwashers and water heaters, extending equipment life with little maintenance required. Soap lathers easily, reducing detergent use, though dry skin or faded laundry may occasionally occur. No water softener is recommended; instead, occasional fixture cleaning with mild acids addresses any spotting from treatment residuals. The 2023 Water Quality Report notes compliance with EPA standards, with monitored detections including TTHMs, chlorate, PCBs, hexavalent chromium, barium, fluoride, manganese, and nitrate; treatment involves coagulation, sedimentation, filtration, and chlorination with orthophosphate for lead and copper control.