How hard is the water in Chowan County, NC?

1.8 grains per gallon

You do not need a softener here.

The median hardness measured in Chowan County, NC is 31 mg/L as calcium carbonate, which is 1.8 gpg. That is soft on the USGS scale. It comes from 275 samples at 12 sites between 1994 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 1.7 and 4.2 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: high (how it is measured).

What to do next

You can skip the softener. At 1.8 gpg the most a softener would fix is the odd water spot. If a salesperson in Chowan County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Chowan County straddles a decision line, check your own tap with a $10 test strip before you spend anything.

More on when a softener is not worth it.

From 1.6 to 22.1 gpg

The softest single sample on record in Chowan County was 27.5 mg/L and the hardest 378 mg/L, a 14-fold gap. The top quarter of sites read above 4.2 gpg and the bottom quarter below 1.7 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 22.1 gpg, rivers and lakes 1.8 gpg

1 groundwater samples from 1 wells put the median at 378 mg/L. 274 surface samples from 11 sites put it at 31 mg/L. In Chowan County the wells come out 20.3 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.

Chowan County against the rest of North Carolina

Among the 99 North Carolina counties with data, Chowan County is number 48 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 Chowan County: Person County (1.8), Camden County (1.7), Caswell County (1.8).