How hard is the water in Brunswick County, NC?
9.7 grains per gallon
A softener is worth it here.
The median hardness measured in Brunswick County, NC is 166 mg/L as calcium carbonate, which is 9.7 gpg. That is hard on the USGS scale. It comes from 71 samples at 51 sites between 1990 and 2025, 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 2.2 and 13.6 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
At 9.7 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Brunswick County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 0.0 to 95.2 gpg
The softest single sample on record in Brunswick County was 0.2 mg/L and the hardest 1,630 mg/L, an 8,150-fold gap. The top quarter of sites read above 13.6 gpg and the bottom quarter below 2.2 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 9.7 gpg, rivers and lakes 175.2 gpg
71 groundwater samples from 51 wells put the median at 166 mg/L. 938 surface samples from 47 sites put it at 3000 mg/L. In Brunswick County the rivers and lakes come out 165.5 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 212 lb of salt a year (6 bags of 40 lb, about $38), and roughly 2,346 gallons of regeneration water. Installed, most units run $1,000 to $4,500; spread over 15 years with salt, that is about $138 a year.
Sizing at 9.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 582 | 24,000 | 71 lb |
| 2 | 1,164 | 24,000 | 142 lb |
| 4 | 2,328 | 24,000 | 283 lb |
| 6 | 3,492 | 32,000 | 425 lb |
Brunswick County against the rest of North Carolina
Among the 99 North Carolina counties with data, Brunswick County is number 12 of 99 counting from the hardest. Across the whole country it is harder than 50% of counties.
Softest in North Carolina: Bertie County at 0.3 gpg. Hardest: Dare County at 63.7 gpg. Closest to Brunswick County: Onslow County (10.3), Carteret County (10.7), Pender County (10.9).