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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.

CityHardness ppm (mg/L)Hardness gpgInformation SourceNotes
Boise City113.06.6Link
Meridian143.48.4LinkAverage of all zones
Nampa60.63.5Link
Idaho Fallsn/an/aLink
Caldwelln/an/aLink
Pocatellon/an/aLink
Coeur d’Alene106.36.2Link
Twin Fallsn/an/aLink
Post Fallsn/an/aLink
Rexburgn/an/aLink
Lewistonn/an/aLink
Eaglen/an/aLink
Kunan/an/aLinkSays they have “hard” water but doesn’t quantify.
Moscow110.46.4Link
Ammon238.014.0Link
Mountain Homen/an/aLink
Hayden76.04.4LinkTook average of 4 wells
Chubbuck332.119.4Link
Starn/an/aLink
Jeromen/an/aLink
Blackfootn/an/aLink
Garden City170.010.0Link
Burleyn/an/aLink
Rathdrumn/an/aLink
Middletonn/an/aLink
Haileyn/an/aLink
Sandpointn/an/aLink
Payetten/an/aLink
Emmettn/an/aLink
Fruitlandn/an/aLink
Rupertn/an/aLink
Weisern/an/aLink
Prestonn/an/aLink
Rigbyn/an/aLink
Shelleyn/an/aLink
Kimberlyn/an/aLink
Buhln/an/aLink
American Fallsn/an/aLink
McCalln/an/aLink
St. Anthonyn/an/aLink
Goodingn/an/aLink
Heyburnn/an/aLink
Ketchumn/an/aLink
Grangevillen/an/aLink
Orofinon/an/aLink
Salmonn/an/aLink
Soda Springsn/an/aLink
Homedalen/an/aLink
Wendelln/an/aLink
Ionan/an/aLink
Filern/an/aLink
Montpeliern/an/aLinkDoesn’t appear to have online CCR. Nothing on EPA CCR search either.
Sugar Cityn/an/aLink
Bellevuen/an/aLink
Bonners Ferryn/an/aLink
Dalton Gardens213.013.4Link
Spirit Laken/an/aLink
St. Mariesn/an/aLinkNo online CCR on the city website or in the EPA CCR search
Kelloggn/an/aLinkOnly shared a partial report on their Facebook
Malad Cityn/an/aLinkWater Dept. doesn’t seem to have an online presence, only a number to call. Nothing on EPA CCR search for Malad either
Victorn/an/aLink
Driggs185.010.8Link
Parman/an/aLinkDoesn’t have online CCR on city site, EPA search didn’t have anything either
Sun Valleyn/an/aLink
Aberdeenn/an/aLink
Priest Rivern/an/aLink
Pinehurstn/an/aLinkDoesn’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
Shoshonen/an/aLink
Wildern/an/aLinkCCR appears to have been taken offline
Osburnn/an/aLinkCity 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 Plymouthn/an/aLink
Ponderayn/an/aLinkPurchases from Sandpoint
Pauln/an/aLink
Glenns Ferryn/an/aLink
Marsingn/an/aLink
Uconn/an/aLink
Kamiahn/an/aLink
Lapwain/an/aLinkNo online CCR
Hansenn/an/aLinkWater Dept has website linked on the city website, but I got an Error 404 trying to access it
Franklinn/an/aLink
Plummern/an/aLink
Geneseen/an/aLink
Kootenain/an/aLinkPurchases from Sandpoint
Cascaden/an/aLink
Hagermann/an/aLink
Ashtonn/an/aLinkNo online CCR, just information on how to lead test own water
Gracen/an/aLink
Challisn/an/aLink
Dovern/an/aLink
Arcon/an/aLink
Counciln/an/aLink
Troyn/an/aLink
Moyie Springsn/an/aLink
Cottonwoodn/an/aLinkDoesn’t appear to have online CCR, doesn’ show up in EPA search, but found a NYT Toxic Waters page for them.
McCammonn/an/aLink
Horseshoe Bendn/an/aLink
Greenleafn/an/aLink
Hazeltonn/an/aLink
Inkomn/an/aLink
Wallacen/an/aLinkDoesn’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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