How hard is the water in Yukon-Koyukuk Census Area, AK?

6.3 grains per gallon

Optional: a softener helps, but plenty of homes skip it.

The median hardness measured in Yukon-Koyukuk Census Area, AK is 107 mg/L as calcium carbonate, which is 6.3 gpg. That is moderately hard on the USGS scale. It comes from 142 samples at 12 sites between 1990 and 2007, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 5.4 and 6.8 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: high (how it is measured).

What to do next

At 6.3 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one.

More on when a softener is not worth it.

From 2.9 to 9.2 gpg

The softest single sample on record in Yukon-Koyukuk Census Area was 49.7 mg/L and the hardest 157 mg/L, a 3-fold gap. The top quarter of sites read above 6.8 gpg and the bottom quarter below 5.4 gpg.

What a softener would cost to run

For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 137 lb of salt a year (4 bags of 40 lb, about $25), 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 $125 a year.

Sizing at 6.3 gpg

Yukon-Koyukuk Census Area against the rest of Alaska

Among the 22 Alaska counties with data, Yukon-Koyukuk Census Area is number 8 of 22 counting from the hardest. Across the whole country it is harder than 36% of counties.

Softest in Alaska: Petersburg Borough at 0.3 gpg. Hardest: Southeast Fairbanks Census Area at 16.3 gpg. Closest to Yukon-Koyukuk Census Area: Northwest Arctic Borough (5.9), Matanuska-Susitna Borough (7.2), Haines Borough (5.2).