Water Hardness Idaho
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Water Hardness Idaho

Here are the water hardness values for the cities in Idaho.
City AVG Hardness PPM / mg/L AVG Hardness Grains per Gallon
Coeur d'Alene 127 7.5
Idaho Falls 239.7 14.1
Meridian 136.8 8
Nampa 60.6 3.6
Pocatello 350 20.5
Twin Falls 275 16.1