How hard is the water in Juneau City and Borough, AK?
3.1 grains per gallon
You do not need a softener here.
The median hardness measured in Juneau City and Borough, AK is 53 mg/L as calcium carbonate, which is 3.1 gpg. That is soft on the USGS scale. It comes from 11 samples at 6 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 1.8 and 3.6 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: medium (how it is measured).
What to do next
You can skip the softener. At 3.1 gpg the most a softener would fix is the odd water spot. If a salesperson in Juneau City and Borough says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Juneau City and 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 1.2 to 5.9 gpg
The softest single sample on record in Juneau City and Borough was 20.7 mg/L and the hardest 101 mg/L, a 5-fold gap. The top quarter of sites read above 3.6 gpg and the bottom quarter below 1.8 gpg.
Wells 3.1 gpg, rivers and lakes 3.5 gpg
11 groundwater samples from 6 wells put the median at 52.8 mg/L. 314 surface samples from 28 sites put it at 59.2 mg/L. In Juneau City and Borough the rivers and lakes come out 0.4 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.
Juneau City and Borough against the rest of Alaska
Among the 22 Alaska counties with data, Juneau City and Borough is number 16 of 22 counting from the hardest. Across the whole country it is harder than 22% of counties.
Softest in Alaska: Petersburg Borough at 0.3 gpg. Hardest: Southeast Fairbanks Census Area at 16.3 gpg. Closest to Juneau City and Borough: Kenai Peninsula Borough (3.2), Wrangell City and Borough (3.4), Hoonah-Angoon Census Area (4.1).