What Is Hard Water and What Does It Do to Plumbing?
Hard water is water with a high dissolved mineral content, primarily calcium and magnesium, picked up as groundwater passes through limestone and other mineral deposits. It is not a health hazard, but it deposits scale inside pipes, water heaters, and fixtures, which shortens equipment life significantly and reduces efficiency.
What scale actually costs you
Scale accumulates on the bottom of a water heater tank and insulates the steel from the water, so the burner or element overheats the metal rather than the water. That is why heavily scaled tanks rumble and pop, and why they fail years early.
In tankless units the effect is more direct: scale on the heat exchanger reduces heat transfer, triggers error codes, and eventually destroys a component costing nearly as much as the unit. This is why annual descaling is mandatory rather than advisory in hard water.
Elsewhere it clogs aerators and showerheads, seizes valve cartridges, and narrows older pipe.
Where it is worst
The hardest water in the US is generally found across the Midwest and the interior West, with Indiana, Iowa, Kansas, Nebraska, the Dakotas, Wisconsin, Utah, Nevada, Arizona, and much of Texas at the top of the range. New England and the Pacific Northwest are generally soft.
Soft water has its own issue: naturally soft, slightly acidic groundwater, as found in parts of New England and the Pacific Northwest, is corrosive to copper and causes pinhole leaks. Neither extreme is ideal.
Frequently asked questions
Does hard water justify a softener?
In genuinely hard water regions, usually yes, on equipment life alone. A softener costs less than the water heaters and fixture repairs it prevents over a decade. In moderately hard water the case is weaker and comes down to preference about spotting, soap performance, and scale on fixtures.
How do I find out how hard my water is?
Your water utility publishes an annual water quality report that states hardness, usually in grains per gallon or parts per million. Home test kits are inexpensive and adequate. For a private well, testing is the only way to know, and it is worth doing periodically anyway.
See also
Related services
- Emergency Water Heater Repair and ReplacementDiagnosis and repair of water heater failures, including leaking tanks, no hot water, pressure relief discharge, and emergency replacement.
- Tankless Water Heater ServiceDiagnosis, descaling, and repair of tankless water heaters, including error code troubleshooting and flow sensor issues.