How hard is the water in Somerset County, MD?

2.7 grains per gallon

You do not need a softener here.

The median hardness measured in Somerset County, MD is 46 mg/L as calcium carbonate, which is 2.7 gpg. That is soft on the USGS scale. It comes from 18 samples at 8 sites between 1991 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 0.6 and 3.3 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 2.7 gpg the most a softener would fix is the odd water spot. If a salesperson in Somerset 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 0.4 to 7.9 gpg

The softest single sample on record in Somerset County was 7 mg/L and the hardest 136 mg/L, a 19-fold gap. The top quarter of sites read above 3.3 gpg and the bottom quarter below 0.6 gpg.

Wells 2.7 gpg, rivers and lakes 4.1 gpg

18 groundwater samples from 8 wells put the median at 46.3 mg/L. 7 surface samples from 7 sites put it at 71 mg/L. In Somerset County the rivers and lakes come out 1.4 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.

Somerset County against the rest of Maryland

Among the 24 Maryland counties with data, Somerset County is number 18 of 24 counting from the hardest. Across the whole country it is harder than 20% of counties.

Softest in Maryland: Charles County at 0.3 gpg. Hardest: Washington County at 18.5 gpg. Closest to Somerset County: Howard County (2.5), Talbot County (3), Caroline County (2.3).