How hard is the water in Lawrence County, MO?
10.4 grains per gallon
A softener is worth it here.
The median hardness measured in Lawrence County, MO is 179 mg/L as calcium carbonate, which is 10.4 gpg. That is hard on the USGS scale. It comes from 16 samples at 12 sites between 1993 and 2026, 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 10.1 and 11.7 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: medium (how it is measured).
What to do next
At 10.4 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Lawrence County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 7.8 to 15.7 gpg
The softest single sample on record in Lawrence County was 133 mg/L and the hardest 268 mg/L, a 2-fold gap. The top quarter of sites read above 11.7 gpg and the bottom quarter below 10.1 gpg.
Wells 10.4 gpg, rivers and lakes 10.5 gpg
16 groundwater samples from 12 wells put the median at 178.5 mg/L. 327 surface samples from 33 sites put it at 179.5 mg/L. In Lawrence County the rivers and lakes come out 0.1 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 228 lb of salt a year (6 bags of 40 lb, about $41), 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 $141 a year.
Sizing at 10.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 624 | 24,000 | 76 lb |
| 2 | 1,248 | 24,000 | 152 lb |
| 4 | 2,496 | 24,000 | 304 lb |
| 6 | 3,744 | 32,000 | 456 lb |
Lawrence County against the rest of Missouri
Among the 110 Missouri counties with data, Lawrence County is number 80 of 110 counting from the hardest. Across the whole country it is harder than 53% of counties.
Softest in Missouri: Livingston County at 4.1 gpg. Hardest: Reynolds County at 96.7 gpg. Closest to Lawrence County: Dunklin County (10.5), Barton County (10.4), Knox County (10.4).