Arizona hard water, city by city

We install salt-free scale control and water softeners across the Phoenix valley and the Tucson area. Below is what each city's own water utility publishes about its water, with the source for every number. On the USGS scale, anything over 10.5 grains per gallon is very hard.

(623) 400-7582

Phoenix valley

City	Hardness	Water provider	Source
Phoenix	10 to 17.6 gpg	City of Phoenix Water Services	2025 report
Glendale	Not published as one range	City of Glendale Water Services	Utility web page
Scottsdale	13 to 17 gpg	Scottsdale Water	2025 report
Mesa	0.4 to 25 gpg	City of Mesa Water Resources	2025 report
Chandler	10.1 to 16.8 gpg	City of Chandler Water	2025 report
Gilbert	6.6 to 17.5 gpg	Town of Gilbert Water	2025 report

Tucson area

City	Hardness	Water provider	Source
Tucson	Not published as one range	Tucson Water	Utility web page
Marana	8 to 18 gpg	Marana Water	October 2024 report
Oro Valley	2.1 to 15.8 gpg	Oro Valley Water Utility	Utility web page

How to read these numbers

Utilities report hardness in milligrams per liter (mg/L, the same as ppm) of calcium carbonate. Divide by 17.1 to get grains per gallon, the unit softeners are sized in. The USGS classes water under 60 mg/L as soft, 61 to 120 as moderately hard, 121 to 180 as hard and anything above 180 as very hard. Every city here that publishes a range reaches the very hard band somewhere in its system.

A citywide range is a starting point, not your number. Phoenix runs five treatment plants, Mesa has three supply zones with different averages, and Marana operates several separate systems. That is why every quote we give starts with a free test at your tap.

Not on the list?

We also install in Tempe, Queen Creek, Peoria, Surprise, Goodyear and Avondale. Those cities don't have a page here yet because we only publish a city once we've read its utility's own water report. We cover the Phoenix valley south to Tucson and the towns in between, so if yours isn't named, call (623) 400-7582 or ask for a free quote and we'll tell you straight away whether we serve your address.