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July 14, 2026

What Arizona Hard Water Does to Your Plumbing

The Phoenix metro has some of the hardest water in the country. Here’s how it affects your pipes, water heater, and fixtures, and what to do about it.

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Most of the Phoenix metro measures 13 to 20+ grains per gallon of hardness, putting it among the hardest water in the United States. That mineral content takes a toll on your home.

Water heaters

Calcium settles at the bottom of tank water heaters, insulating the water from the burner and causing popping noises, lower efficiency, and early failure. Tankless units build up scale inside their heat exchangers.

Fixtures and appliances

Scale clogs aerators and showerheads, wears out cartridges and flappers, and shortens the life of dishwashers, washing machines, and ice makers.

Pipes

Over many years, scale narrows the inside of pipes, reducing pressure and trapping debris that leads to clogs.

Solutions

  • Install a water softener or salt-free conditioner
  • Flush your tank water heater once a year
  • Descale tankless water heaters annually
  • Add reverse osmosis for drinking water

Baja Plumbing Co offers free water hardness testing with any service. Book online to get started.

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