How hard is the water in Grand Forks County, ND?
44.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Grand Forks County, ND is 768 mg/L as calcium carbonate, which is 44.9 gpg. That is very hard on the USGS scale. It comes from 9 samples at 7 sites between 1990 and 2024, 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 30.1 and 66.9 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
At 44.9 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water.
More on sizing a softener for your household.
From 13.2 to 120.3 gpg
The softest single sample on record in Grand Forks County was 226 mg/L and the hardest 2,060 mg/L, a 9-fold gap. The top quarter of sites read above 66.9 gpg and the bottom quarter below 30.1 gpg.
Wells 44.9 gpg, rivers and lakes 21.8 gpg
9 groundwater samples from 7 wells put the median at 768 mg/L. 860 surface samples from 28 sites put it at 374 mg/L. In Grand Forks County the wells come out 23.1 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.
What a softener would cost to run
For a household of 3, a 64,000-grain unit covers a week between regenerations. Expect about 980 lb of salt a year (25 bags of 40 lb, about $176), 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 $276 a year.
Sizing at 44.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 2,694 | 24,000 | 328 lb |
| 2 | 5,388 | 40,000 | 656 lb |
| 4 | 10,776 | 80,000 | 1,311 lb |
| 6 | 16,164 | twin tank | 1,967 lb |
Grand Forks County against the rest of North Dakota
Among the 53 North Dakota counties with data, Grand Forks County is number 5 of 53 counting from the hardest. Across the whole country it is harder than 97% of counties.
Softest in North Dakota: Hettinger County at 1.1 gpg. Hardest: Walsh County at 54 gpg. Closest to Grand Forks County: Towner County (49.6), Ward County (50.8), Sheridan County (52.2).