How hard is the water in Denali Borough, AK?
10.3 grains per gallon
A softener is worth it here.
The median hardness measured in Denali Borough, AK is 176 mg/L as calcium carbonate, which is 10.3 gpg. That is hard on the USGS scale. It comes from 205 samples at 28 sites between 1990 and 2011, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 6.5 and 17 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 10.3 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 Denali Borough 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 2.7 to 43.2 gpg
The softest single sample on record in Denali Borough was 46.1 mg/L and the hardest 739 mg/L, a 16-fold gap. The top quarter of sites read above 17 gpg and the bottom quarter below 6.5 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 24.6 gpg, rivers and lakes 10.3 gpg
20 groundwater samples from 2 wells put the median at 420.5 mg/L. 185 surface samples from 26 sites put it at 176.3 mg/L. In Denali Borough the wells come out 14.3 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.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 225 lb of salt a year (6 bags of 40 lb, about $40), 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 $140 a year.
Sizing at 10.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 618 | 24,000 | 75 lb |
| 2 | 1,236 | 24,000 | 150 lb |
| 4 | 2,472 | 24,000 | 301 lb |
| 6 | 3,708 | 32,000 | 451 lb |
Denali Borough against the rest of Alaska
Among the 22 Alaska counties with data, Denali Borough is number 3 of 22 counting from the hardest. Across the whole country it is harder than 52% of counties.
Softest in Alaska: Petersburg Borough at 0.3 gpg. Hardest: Southeast Fairbanks Census Area at 16.3 gpg. Closest to Denali Borough: North Slope Borough (10), Anchorage Municipality (7.6), Yakutat City and Borough (7.4).