DFW water is moderately hard, typically ranging from 150–250 mg/L depending on the city and season. It's not the hardest water in Texas, but it's hard enough to deposit scale in water heaters, reduce appliance efficiency, and leave spots on fixtures. Annual water heater maintenance is the most important response.
Hard water is one of those topics that gets oversimplified in both directions — either dismissed as cosmetic or treated as a crisis requiring a whole-house softener. The honest answer for DFW is somewhere in between.
How Hard Is DFW Water?
Water hardness is measured in milligrams per liter (mg/L) or grains per gallon (GPG). DFW cities typically measure between 150–250 mg/L (9–15 GPG), which puts the area in the "moderately hard" to "hard" range on the standard scale. Plano's supply, drawn primarily from Lake Lavon and Lake Texoma, has varied seasonally. The key word is "moderately" — this is not the extreme hardness found in some West Texas communities, but it's significant enough to affect appliances and fixtures over time.
What Hard Water Actually Does to Your Home
Scale deposits: Calcium and magnesium precipitate out of hot water and accumulate inside water heaters, tankless heat exchangers, and dishwashers. This is the most significant practical impact — sediment in a tank reduces efficiency and shortens lifespan; scale in a tankless exchanger causes overheat faults and eventual failure. Fixtures and glass: white scale deposits on shower doors and faucets are cosmetic but stubborn. Soap: hard water reduces soap lathering — more soap is needed for the same cleaning effect. Skin and hair: some sensitivity, though highly individual.
The Right Response for Most DFW Homes
Annual water heater maintenance (flush for tanks, descale for tankless) is the most important and cost-effective response. A water softener makes sense if you're seeing significant fixture or appliance impact, or if you have a tankless unit that you want to protect long-term. A softener is not mandatory for every DFW home with moderately hard water. Call Staggs Plumbing at 682-284-0966 for a water assessment.
