How hard is the water in Oktibbeha County, MS?
1.9 grains per gallon
You do not need a softener here.
The median hardness measured in Oktibbeha County, MS is 33 mg/L as calcium carbonate, which is 1.9 gpg. That is soft on the USGS scale. It comes from 9 samples at 4 sites between 2005 and 2013, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 1.6 and 2.4 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: medium (how it is measured).
What to do next
You can skip the softener. At 1.9 gpg the most a softener would fix is the odd water spot. If a salesperson in Oktibbeha County says otherwise, ask to see their reading in grains per gallon and compare it with this one.
More on when a softener is not worth it.
From 1.3 to 3.1 gpg
The softest single sample on record in Oktibbeha County was 22 mg/L and the hardest 52.8 mg/L, a 2-fold gap. The top quarter of sites read above 2.4 gpg and the bottom quarter below 1.6 gpg.
Wells 2.2 gpg, rivers and lakes 1.6 gpg
3 groundwater samples from 3 wells put the median at 37.3 mg/L. 6 surface samples from 1 sites put it at 28.1 mg/L. In Oktibbeha County the wells come out 0.6 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.
Oktibbeha County against the rest of Mississippi
Among the 78 Mississippi counties with data, Oktibbeha County is number 31 of 78 counting from the hardest. Across the whole country it is harder than 15% of counties.
Softest in Mississippi: Issaquena County at 0.1 gpg. Hardest: Franklin County at 60.5 gpg. Closest to Oktibbeha County: Hinds County (2), Scott County (2), Grenada County (1.8).