Know your water
Use Mesa's hard water information
If the City of Mesa supplies your water, its Common Water Quality Concerns page includes a hard water section. It explains that calcium and magnesium cause hardness and that the level depends on the water source serving your area.
That general information is a starting point, not a measurement for your address. Pair it with what you see at home, such as chalky film on faucets or shower doors, and with any hardness test results you already have.
