How hard is the water in Kenai Peninsula Borough, AK?
3.2 grains per gallon
You do not need a softener here.
The median hardness measured in Kenai Peninsula Borough, AK is 55 mg/L as calcium carbonate, which is 3.2 gpg. That is soft on the USGS scale. It comes from 82 samples at 81 sites between 1990 and 2014, 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 2.1 and 4.4 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 3.2 gpg the most a softener would fix is the odd water spot. If a salesperson in Kenai Peninsula Borough says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Kenai Peninsula Borough 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 0.5 to 8.6 gpg
The softest single sample on record in Kenai Peninsula Borough was 8.7 mg/L and the hardest 147 mg/L, a 17-fold gap. The top quarter of sites read above 4.4 gpg and the bottom quarter below 2.1 gpg.
Wells 3.2 gpg, rivers and lakes 1.5 gpg
82 groundwater samples from 81 wells put the median at 54.8 mg/L. 195 surface samples from 52 sites put it at 24.9 mg/L. In Kenai Peninsula Borough the wells come out 1.7 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
Kenai Peninsula Borough against the rest of Alaska
Among the 22 Alaska counties with data, Kenai Peninsula Borough is number 15 of 22 counting from the hardest. Across the whole country it is harder than 23% of counties.
Softest in Alaska: Petersburg Borough at 0.3 gpg. Hardest: Southeast Fairbanks Census Area at 16.3 gpg. Closest to Kenai Peninsula Borough: Juneau City and Borough (3.1), Wrangell City and Borough (3.4), Hoonah-Angoon Census Area (4.1).