Addison Water Hardness & Quality Report (2026)

The Town of Addison purchases all of its drinking water from Dallas Water Utilities, a service that supports around 16,000 residents in Dallas County, Texas. Dallas draws its supply from seven distinct locations. These include the Elm Fork of the Trinity River and six major reservoirs: Lake Ray Roberts, Lake Lewisville, Lake Grapevine, Lake Ray Hubbard, Lake Tawakoni, and Lake Fork. Treatment processes are managed by Dallas's facilities. These involve settling, filtration, chemical additions, ozone disinfection, chloramine and lime treatment for solids and corrosion control, iron sulfate, and activated carbon for taste and odor improvements. Addison itself does not operate treatment plants, relying entirely on Dallas's extensive infrastructure.

The watershed supplying this water stretches across the upper Trinity River basin in North Texas. Its geology is characterized by Cretaceous rock formations, specifically the Trinity and Woodbine Groups. These layers contain significant amounts of sandstone, limestone, and evaporitic deposits. As surface water and river flows interact with this terrain, calcium and magnesium ions dissolve from the carbonate rocks. This process is the primary reason for the water's hard character. Unlike some regions, Addison's water supply is entirely surface-derived, with no groundwater aquifers influencing its mineral content. Seasonal precipitation and the region's limestone-dominated landscape further shape its chemistry.

Homeowners in Addison often notice moderate scale buildup in their plumbing, water heaters, dishwashers, and washing machines. This accumulation can reduce the efficiency and lifespan of these appliances. You might also see spots on glassware and films on bathroom fixtures. Visible deposits can form over time on boilers and faucets. To combat these issues, homeowners can try regular descaling with vinegar, installing drain screens, and flushing heaters annually. For those seeking to prevent mineral accumulation and extend appliance life, installing a water softener is a recommended solution. Addison's water meets all federal and state standards, with treatment effectively managing contaminants and disinfection byproducts.