How hard is the water in Granville County, NC?

1.9 grains per gallon

You do not need a softener here.

The median hardness measured in Granville County, NC is 32 mg/L as calcium carbonate, which is 1.9 gpg. That is soft on the USGS scale. It comes from 482 samples at 32 sites between 1990 and 2025, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 1.5 and 2.7 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: high (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 Granville 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 0.9 to 11.7 gpg

The softest single sample on record in Granville County was 15 mg/L and the hardest 200 mg/L, a 13-fold gap. The top quarter of sites read above 2.7 gpg and the bottom quarter below 1.5 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 11.7 gpg, rivers and lakes 1.9 gpg

1 groundwater samples from 1 wells put the median at 200 mg/L. 481 surface samples from 31 sites put it at 31.7 mg/L. In Granville County the wells come out 9.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.

Granville County against the rest of North Carolina

Among the 99 North Carolina counties with data, Granville County is number 46 of 99 counting from the hardest. Across the whole country it is harder than 15% of counties.

Softest in North Carolina: Bertie County at 0.3 gpg. Hardest: Dare County at 63.7 gpg. Closest to Granville County: Northampton County (1.8), Chowan County (1.8), Person County (1.8).