How hard is the water in Matanuska-Susitna Borough, AK?
7.2 grains per gallon
A softener is worth it here.
The median hardness measured in Matanuska-Susitna Borough, AK is 124 mg/L as calcium carbonate, which is 7.2 gpg. That is hard on the USGS scale. It comes from 47 samples at 43 sites between 1990 and 2023, 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 6.3 and 9.5 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 7.2 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 Matanuska-Susitna 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 0.0 to 15.8 gpg
The softest single sample on record in Matanuska-Susitna Borough was 0.7 mg/L and the hardest 270 mg/L, a 386-fold gap. The top quarter of sites read above 9.5 gpg and the bottom quarter below 6.3 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 7.2 gpg, rivers and lakes 3.7 gpg
47 groundwater samples from 43 wells put the median at 124 mg/L. 322 surface samples from 29 sites put it at 63.2 mg/L. In Matanuska-Susitna Borough the wells come out 3.5 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 158 lb of salt a year (4 bags of 40 lb, about $28), 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 $128 a year.
Sizing at 7.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 432 | 24,000 | 53 lb |
| 2 | 864 | 24,000 | 105 lb |
| 4 | 1,728 | 24,000 | 210 lb |
| 6 | 2,592 | 24,000 | 315 lb |
Matanuska-Susitna Borough against the rest of Alaska
Among the 22 Alaska counties with data, Matanuska-Susitna Borough is number 7 of 22 counting from the hardest. Across the whole country it is harder than 40% of counties.
Softest in Alaska: Petersburg Borough at 0.3 gpg. Hardest: Southeast Fairbanks Census Area at 16.3 gpg. Closest to Matanuska-Susitna Borough: Yakutat City and Borough (7.4), Anchorage Municipality (7.6), Yukon-Koyukuk Census Area (6.3).