How hard is the water in Gila County, AZ?
16.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Gila County, AZ is 285 mg/L as calcium carbonate, which is 16.6 gpg. That is very hard on the USGS scale. It comes from 1,116 samples at 400 sites between 1990 and 2023, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 12.2 and 30.4 gpg. The whole middle of that range gives the same answer, so a test of your own tap is unlikely to change it. Confidence in the county figure: high (how it is measured).
What to do next
At 16.6 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water.
More on sizing a softener for your household.
From 2.3 to 142.0 gpg
The softest single sample on record in Gila County was 39.5 mg/L and the hardest 2,430 mg/L, a 62-fold gap. The top quarter of sites read above 30.4 gpg and the bottom quarter below 12.2 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 16.6 gpg, rivers and lakes 11.1 gpg
1,116 groundwater samples from 400 wells put the median at 285 mg/L. 1,709 surface samples from 170 sites put it at 190 mg/L. In Gila County the wells come out 5.5 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 364 lb of salt a year (10 bags of 40 lb, about $65), and roughly 2,346 gallons of regeneration water. Installed, most units run $1,000 to $4,500; spread over 15 years with salt, that is about $165 a year.
Sizing at 16.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 996 | 24,000 | 121 lb |
| 2 | 1,992 | 24,000 | 242 lb |
| 4 | 3,984 | 32,000 | 485 lb |
| 6 | 5,976 | 48,000 | 727 lb |
Gila County against the rest of Arizona
Among the 15 Arizona counties with data, Gila County is number 3 of 15 counting from the hardest. Across the whole country it is harder than 75% of counties.
Softest in Arizona: Navajo County at 9 gpg. Hardest: Yuma County at 28.7 gpg. Closest to Gila County: Mohave County (16.6), Coconino County (14.6), Yavapai County (14.3).