How hard is the water in Newton County, MO?
9.4 grains per gallon
A softener is worth it here.
The median hardness measured in Newton County, MO is 162 mg/L as calcium carbonate, which is 9.4 gpg. That is hard on the USGS scale. It comes from 21 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 7.9 and 10.2 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: medium (how it is measured).
What to do next
At 9.4 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.
More on sizing a softener for your household.
From 7.0 to 13.1 gpg
The softest single sample on record in Newton County was 119 mg/L and the hardest 223.5 mg/L, a 2-fold gap. The top quarter of sites read above 10.2 gpg and the bottom quarter below 7.9 gpg.
Wells 9.4 gpg, rivers and lakes 9.2 gpg
21 groundwater samples from 12 wells put the median at 161.5 mg/L. 599 surface samples from 65 sites put it at 158 mg/L. In Newton County the wells come out 0.2 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. 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 206 lb of salt a year (6 bags of 40 lb, about $37), 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 $137 a year.
Sizing at 9.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 564 | 24,000 | 69 lb |
| 2 | 1,128 | 24,000 | 137 lb |
| 4 | 2,256 | 24,000 | 274 lb |
| 6 | 3,384 | 24,000 | 412 lb |
Newton County against the rest of Missouri
Among the 110 Missouri counties with data, Newton County is number 95 of 110 counting from the hardest. Across the whole country it is harder than 49% of counties.
Softest in Missouri: Livingston County at 4.1 gpg. Hardest: Reynolds County at 96.7 gpg. Closest to Newton County: Stone County (9.5), Barry County (9.4), Ste. Genevieve County (9.6).