How hard is the water in Murray County, OK?
19.2 grains per gallon
A softener will pay its way here.
The median hardness measured in Murray County, OK is 328 mg/L as calcium carbonate, which is 19.2 gpg. That is very hard on the USGS scale. It comes from 250 samples at 61 sites between 1990 and 2025, 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 17.3 and 20.9 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 19.2 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 0.6 to 43.5 gpg
The softest single sample on record in Murray County was 10.5 mg/L and the hardest 745 mg/L, a 71-fold gap. The top quarter of sites read above 20.9 gpg and the bottom quarter below 17.3 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 19.2 gpg, rivers and lakes 16.1 gpg
250 groundwater samples from 61 wells put the median at 328 mg/L. 893 surface samples from 26 sites put it at 276 mg/L. In Murray County the wells come out 3.1 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 32,000-grain unit covers a week between regenerations. Expect about 418 lb of salt a year (11 bags of 40 lb, about $75), 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 $175 a year.
Sizing at 19.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,152 | 24,000 | 140 lb |
| 2 | 2,304 | 24,000 | 280 lb |
| 4 | 4,608 | 40,000 | 561 lb |
| 6 | 6,912 | 64,000 | 841 lb |
Murray County against the rest of Oklahoma
Among the 77 Oklahoma counties with data, Murray County is number 27 of 77 counting from the hardest. Across the whole country it is harder than 82% of counties.
Softest in Oklahoma: McCurtain County at 0.8 gpg. Hardest: Greer County at 125 gpg. Closest to Murray County: Noble County (19.6), Carter County (18.7), Marshall County (18.6).