Reno Water Hardness & Quality Report (2026)

The Truckee Meadows Water Authority (TMWA) supplies drinking water to Reno-Sparks in Washoe County, Nevada, serving over 500,000 residents. The primary source is the Truckee River, originating at Lake Tahoe with tributaries including the Little Truckee River, Squaw Creek, and Steamboat Creek, providing about 85% of supply. Remaining water comes from more than 90 deep wells in the Truckee Meadows aquifer and small satellite groundwater systems. Water undergoes multistage treatment including filtration and disinfection before distribution; TMWA manages the system comprehensively.

The Truckee River watershed spans the Sierra Nevada, fed by snowmelt and rain in the Lake Tahoe and Truckee basins, flowing into the Great Basin desert at Pyramid Lake. River water passes over granitic and volcanic rocks with low mineral solubility, yielding a relatively soft character. Groundwater from Truckee Meadows wells draws from alluvial aquifers overlying sedimentary and Tertiary volcanic geology, imparting higher mineral content through natural leaching. This blend creates variable water chemistry — softer during high river use and more mineralized with greater well reliance, shaped by Nevada's arid climate and diverse rock formations.

Reno's supply is relatively soft overall, causing minimal scale buildup compared to harder regions. Affected appliances include water heaters, dishwashers, and washing machines, with light spotting on fixtures possible during periods of higher groundwater use. Maintenance involves periodic vinegar descaling and checking aerators. A whole-home softener is typically not required but may benefit those noticing effects during well-blended periods. The 2025 TMWA Water Quality Report confirms all primary contaminants meet EPA and Nevada standards with no violations; treatment includes coagulation, filtration, and disinfection.