Utilities / Arizona

Arizona water hardness

1 Arizona system with a hardness figure read from an official page on 2026-10-16. This is not a list of every utility in Arizona; it is the list of those whose published figure has been verified here.

Soft Soft 0–60

Moderately hard Moderate 61–120

Hard Hard 121–180

Very hard Very hard 181+

Phoenix, AZ 237 mg/L 13.9 gpg Very hard

mg/L as calcium carbonate. Each classification band is drawn the same width, so the axis is not linear in mg/L.

Arizona systems on the USGS classification. Each row links to that system's published figure, report year and conversion. Grains per gallon are the utility's own figure where it published one, and our conversion at 17.1 mg/L per grain where it did not.

Phoenix, AZ — City of Phoenix Water Services Department 237 mg/L (13.9 gpg) Very hard Published range 172–302 mg/L. City of Phoenix 2025 Water Quality Report. Retrieved 2026-10-16.

Other states with verified systems

All verified systems Convert a figure from your own report How to read a water quality report