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Idaho Water Hardness

Across the 5 cities we track in Idaho, hardness ranges from 6.1–20.5 GPG, with 3 cities running hard or very hard, and 1 more city doesn't publish a figure.

5 cities tracked. View the Idaho hardness map → · Is Idaho water safe to drink? →

Pocatello

20.5 GPG · 350 ppm
Very Hard

Twin Falls

16 GPG · 274 ppm
Very Hard

Nampa

7.08 GPG · 121 ppm
Hard

Boise

6.1 GPG · 105 ppm
Moderate

Meridian

6.1 GPG · 105 ppm
Moderate

Cities with no published figure

These Idaho cities don't publish a hardness number (it isn't a regulated parameter), so they can't be ranked — but we still track them. See each page for how to check your own tap.

Idaho Falls

Hardness not published
Not Published