Water Hardness in Idaho Cities

Water Hardness in Idaho Cities

Water hardness is determined by the concentration of dissolved calcium and magnesium in water, and this characteristic can greatly differ across the United States, influenced by the specific geological and environmental conditions of each region.

In Idaho, the range of water hardness can vary from moderate to very hard, depending largely on the geological makeup of the region and the sources of its water supply. Idaho’s terrain, which encompasses vast agricultural areas, combined with its dependence on both surface water and groundwater, plays a significant role in determining the state’s water hardness levels. Within Idaho, the degree of water hardness can vary noticeably from one area to another and may also change over time in a specific locale due to alterations in water treatment methods and shifts in water sources. These fluctuations in hardness can affect various aspects, including the water’s taste. Additionally, it can influence the performance of soaps and detergents, presenting challenges for households and industries alike in terms of maintaining water quality and ensuring the efficiency of equipment.

The water hardness levels in Idaho also display variability across different cities, with measurements provided in parts per million (ppm) and grains per gallon (gpg). Boise City has a moderate hardness level at 113.0ppm or 6.6gpg. Meridian’s water is harder at 143.4ppm or 8.4gpg, indicating a higher mineral content. In contrast, Nampa’s water is softer with a hardness of 60.6ppm or 3.5gpg. Coeur d’Alene and Moscow have similar hardness levels, recorded at 106.3ppm or 6.2gpg and 110.4ppm or 6.4gpg, respectively. Notably, Ammon shows a high hardness level at 238.0ppm or 14.0gpg, while Chubbuck has an exceptionally high water hardness, the highest in this list, at 332.1ppm or 19.4gpg. Interestingly, Garden City also has a relatively high hardness at 170.0ppm or 10.0gpg. Meanwhile, cities like Idaho Falls, Caldwell, and many others did not have available data on their water hardness.

City Hardness ppm (mg/L) Hardness gpg Information Source Notes
Boise City 113.0 6.6 Link
Meridian 143.4 8.4 Link Average of all zones
Nampa 60.6 3.5 Link
Idaho Falls n/a n/a Link
Caldwell n/a n/a Link
Pocatello n/a n/a Link
Coeur d’Alene 106.3 6.2 Link
Twin Falls n/a n/a Link
Post Falls n/a n/a Link
Rexburg n/a n/a Link
Lewiston n/a n/a Link
Eagle n/a n/a Link
Kuna n/a n/a Link Says they have “hard” water but doesn’t quantify.
Moscow 110.4 6.4 Link
Ammon 238.0 14.0 Link
Mountain Home n/a n/a Link
Hayden 76.0 4.4 Link Took average of 4 wells
Chubbuck 332.1 19.4 Link
Star n/a n/a
Jerome n/a n/a Link
Blackfoot n/a n/a Link
Garden City 170.0 10.0 Link
Burley n/a n/a Link
Rathdrum n/a n/a Link
Middleton n/a n/a Link
Hailey n/a n/a Link
Sandpoint n/a n/a Link
Payette n/a n/a Link
Emmett n/a n/a Link
Fruitland n/a n/a Link
Rupert n/a n/a Link
Weiser n/a n/a
Preston n/a n/a Link
Rigby n/a n/a Link
Shelley n/a n/a Link
Kimberly n/a n/a Link
Buhl n/a n/a Link
American Falls n/a n/a
McCall n/a n/a Link
St. Anthony n/a n/a Link
Gooding n/a n/a Link
Heyburn n/a n/a Link
Ketchum n/a n/a Link
Grangeville n/a n/a Link
Orofino n/a n/a Link
Salmon n/a n/a Link
Soda Springs n/a n/a Link
Homedale n/a n/a Link
Wendell n/a n/a Link
Iona n/a n/a Link
Filer n/a n/a Link
Montpelier n/a n/a Link Doesn’t appear to have online CCR. Nothing on EPA CCR search either.
Sugar City n/a n/a Link
Bellevue n/a n/a Link
Bonners Ferry n/a n/a Link
Dalton Gardens 213.0 13.4 Link
Spirit Lake n/a n/a Link
St. Maries n/a n/a Link No online CCR on the city website or in the EPA CCR search
Kellogg n/a n/a Link Only shared a partial report on their Facebook
Malad City n/a n/a Link Water Dept. doesn’t seem to have an online presence, only a number to call. Nothing on EPA CCR search for Malad either
Victor n/a n/a Link
Driggs 185.0 10.8 Link
Parma n/a n/a Link Doesn’t have online CCR on city site, EPA search didn’t have anything either
Sun Valley n/a n/a Link
Aberdeen n/a n/a Link
Priest River n/a n/a Link
Pinehurst n/a n/a Link Doesn’t look like they have a website or any online presence. May be the same as Kellogg, though there are two distinct districts listed for them. NOthing on EPA search either
Shoshone n/a n/a Link
Wilder n/a n/a Link CCR appears to have been taken offline
Osburn n/a n/a Link City doesn’t appear to have online presence, could only find direct info about their sewer, not drinking water. Nothing on EPA CCR Search either.
New Plymouth n/a n/a Link
Ponderay n/a n/a Link Purchases from Sandpoint
Paul n/a n/a Link
Glenns Ferry n/a n/a Link
Marsing n/a n/a Link
Ucon n/a n/a Link
Kamiah n/a n/a Link
Lapwai n/a n/a Link No online CCR
Hansen n/a n/a Link Water Dept has website linked on the city website, but I got an Error 404 trying to access it
Franklin n/a n/a Link
Plummer n/a n/a Link
Genesee n/a n/a
Kootenai n/a n/a Link Purchases from Sandpoint
Cascade n/a n/a Link
Hagerman n/a n/a Link
Ashton n/a n/a Link No online CCR, just information on how to lead test own water
Grace n/a n/a Link
Challis n/a n/a Link
Dover n/a n/a Link
Arco n/a n/a Link
Council n/a n/a Link
Troy n/a n/a Link
Moyie Springs n/a n/a Link
Cottonwood n/a n/a Link Doesn’t appear to have online CCR, doesn’ show up in EPA search, but found a NYT Toxic Waters page for them.
McCammon n/a n/a Link
Horseshoe Bend n/a n/a Link
Greenleaf n/a n/a Link
Hazelton n/a n/a Link
Inkom n/a n/a Link
Wallace n/a n/a Link Doesn’t appear to have online presence
Top 100 Idaho cities by population and their reported water hardness
ppm = Parts Per Million
mg/L = Milligrams Per Liter
gpg = Grains Per Gallon

Hard water can cause issues such as mineral buildup in plumbing and appliances, reduce the efficacy of soaps and detergents, and affect the taste of the water. A tried and true solution is the use of a water softener. A water softener, like the ones from DROP, could be a worthwhile investment.

These devices work by replacing the calcium and magnesium ions that cause hardness with sodium ions, resulting in softer water. With innovative features, easy installation, and efficient operation, DROP smart water softeners provide a solution to hard water issues, extending the lifespan of appliances, improving water taste, enhancing soap effectiveness, reducing scale build-up, and increasing the overall water efficiency in your home.

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