Truckee Water Hardness & Quality Report (2026)

Truckee Donner Public Utility District (TDPUD) supplies drinking water to the Town of Truckee and surrounding areas in Nevada County, California, serving approximately 16,000 residents across 45 square miles. The utility draws 100% of its supply from four deep groundwater wells in the Martis Valley Groundwater Basin, with no surface water sources or reservoirs utilized. Water receives basic disinfection via chlorination at the wells, along with fluoridation for dental health. TDPUD operates under strict monitoring by the California State Water Resources Control Board.

The Truckee River Watershed, spanning the Sierra Nevada, feeds the Martis Valley Groundwater Basin through natural recharge. Key geological features include Quaternary alluvial sediments — gravels, sands, silts — from glacial melt overlying Mesozoic granitic rocks of the Sierra Nevada Batholith. Absent are carbonate formations like limestone or dolomite, so the groundwater develops a very soft character with minimal mineral pickup during subsurface flow. This Sierra foothill geology consistently produces low-mineralized water, protected by the basin's confined aquifer structure from surface contamination.

Very soft water minimizes scale buildup in pipes, water heaters, and appliances, reducing maintenance needs and extending equipment life. Laundry detergents and soaps lather efficiently, though very soft water may feel slick and can corrode fixtures if overly aggressive. No softener is needed or recommended; instead, focus on annual wellhead inspections, flushing sediment from faucets, and monitoring for iron staining from granitic minerals. TDPUD water meets all federal and state standards, with pH typically 7.5–8.2 from natural alkalinity and full compliance with the Lead and Copper Rule.