Water Hardness in Phoenix, Arizona
City of Phoenix Water Services
Utility-reported range
10.1–17.7 GPG
172–302 ppm as calcium carbonate
Source period
2025
Source checked 2026-09-15
What the local data tells you
Distribution-system results span several sources and sampling locations. The report does not assign these endpoints to specific neighbourhoods.
Water sources listed for Phoenix: Salt and Verde Rivers, Colorado River via CAP, and groundwater. Source blends, sampling locations and treatment can affect the hardness at a particular property.
The endpoints describe the range published by the utility. We do not treat the midpoint as a measured city average, or assign a value to an individual neighbourhood without supporting data.
Source and coverage
2025 Water Quality Report, aesthetic water quality tablePublic water system ID: AZ0407025
This is municipal water information, not a test of your home. Check the utility on your water bill, particularly near city boundaries or if you use a private well.
How we verify sources and handle estimatesChoosing a softener for your home
Start with a hardness test on the water entering the softener. Next, estimate the household water use that actually passes through it. Outdoor irrigation is usually a separate demand and should not automatically be included.
A softener needs enough usable exchange capacity between regenerations and enough service flow for fixtures used at the same time. The advertised grain capacity is not necessarily the capacity at an efficient salt setting. Compare the manufacturer's capacity and salt-dose table, ongoing salt use, installation requirements and warranty.