How hard is the water in Sierra County, CA?

1.7 grains per gallon

You do not need a softener here.

The median hardness measured in Sierra County, CA is 29 mg/L as calcium carbonate, which is 1.7 gpg. That is soft on the USGS scale. It comes from 5 samples at 5 sites between 1991 and 2016, 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 1 and 3.2 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

You can skip the softener. At 1.7 gpg the most a softener would fix is the odd water spot. If a salesperson in Sierra 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 0.8 to 5.5 gpg

The softest single sample on record in Sierra County was 13.1 mg/L and the hardest 94.9 mg/L, a 7-fold gap. The top quarter of sites read above 3.2 gpg and the bottom quarter below 1 gpg.

Wells 1.7 gpg, rivers and lakes 2.6 gpg

5 groundwater samples from 5 wells put the median at 28.9 mg/L. 10 surface samples from 6 sites put it at 45.1 mg/L. In Sierra County the rivers and lakes come out 0.9 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.

Sierra County against the rest of California

Among the 58 California counties with data, Sierra County is the softest. Across the whole country it is harder than 14% of counties.

Hardest: Calaveras County at 98.3 gpg. Closest to Sierra County: El Dorado County (2.6), Mariposa County (2.7), Tuolumne County (2.8).