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Water Hardness in Arizona Cities

Water hardness generally refers to the concentration of dissolved calcium and magnesium in water. These levels can be quite diverse throughout the United States, with different regions experiencing varying degrees of water hardness.

In Arizona, water hardness is typically higher, often categorized as ‘hard to very hard,’ when compared to many other parts of the country—owing largely to the state’s geology and the sources of its water supply. Arizona’s desert landscape and reliance on mineral-rich sources like the Colorado River contribute to the hardness of the water. As with any area, water hardness in Arizona can also vary from one city to another and can change over time due to factors such as water treatment processes and shifts in water sources. This high hardness level affects aspects like taste, and it can decrease the efficiency of soaps and detergents, leading to challenges in residential and industrial settings.

The water hardness levels in the state of Arizona show considerable variation across different cities, with measurements given in parts per million (ppm) and grains per gallon (gpg). Cities such as Gilbert and Tempe display moderate hardness levels at 196.4ppm, 11.5gpg, and 146.0ppm, 8.0gpg, respectively. In contrast, Avondale shows a significantly higher level at 357.3ppm and 20.9gpg. Meanwhile, cities like Chandler and Mesa possess higher concentrations of hardness, reaching 330.5ppm, 19.3gpg, and 226.0ppm, 13.2gpg, respectively. It is also notable that the lowest measurable water hardness level among the cities listed is found in Surprise, with a level of 90.7ppm and 5.3gpg. However, several cities, including Tucson, Buckeye, Yuma, and others did not have available data.

CityHardness ppm (mg/L)Hardness gpgInformation SourceNotes
Phoenix232.513.6Link
Tucsonn/an/aLink
Mesa226.013.2Link
Chandler330.519.3Link
Gilbert196.411.5Link
Glendale250.014.6Link
Scottsdale278.516.3Link
Peoria166.49.7LinkGrabbed 6 locations to get a range (in gpg) and took an average.
Tempe146.08.0Link
Surprise90.75.3LinkUsed Mountain Vista System, which supplies majority of the city.
Goodyear308.118.0Link
Buckeyen/an/aLink
Yuman/an/aLink
Avondale357.320.9Link
Flagstaffn/an/aLink
Queen Creek206.012.0Link
Maricopan/an/aLink
Lake Havasu City320.118.7Link
Casa Granden/an/aLink
Marana137.58.0Link
Prescott Valley130.07.6Link
Oro Valleyn/an/aLink
Prescott102.56.0Link
Sierra Vistan/an/aLink
Bullhead Cityn/an/aLinkChecked Desert Foothills and Mohave Reports as those are biggest per EPA search. Neither report hardness.
Apache Junctionn/an/aLink
San Luisn/an/aLink
El Mirage119.87.0Link
Sahuaritan/an/aLink
Kingmann/an/aLink
Florencen/an/aLink
Fountain Hills273.916.0Link
Nogalesn/an/aLink
Payson146.08.5Link
Douglasn/an/aLink
Eloyn/an/aLink
Coolidgen/an/aLink
Somertonn/an/aLink
Chino Valleyn/an/aLink
Paradise Valley205.412.0Link
Cottonwoodn/an/aLink
Camp Verde102.55.9Link
Show Lown/an/aLink
Saffordn/an/aLink
Sedonan/an/aLink
Winslown/an/aLink
Wickenburgn/an/aLink
Pagen/an/aLink
Tolleson146.08.5Link
Globen/an/aLink
Youngtown136.98.0Link
Litchfield Park204.011.9Link
Snowflaken/an/aLink
Bensonn/an/aLink
Thatchern/an/aLinkCovered under Safford per EPA lookup
Guadalupe146.08.0LinkCovered under Tempe
Cave Creek231.113.5Link
Bisbeen/an/aLink
Holbrookn/an/aLink
Clarkdalen/an/aLink
South Tucsonn/an/aLinkCovered under Tucson
Dewey-Humboldtn/an/aLink
Eagarn/an/aLink
Taylorn/an/aLinkMost recent is 2015
Pinetop-Lakesiden/an/aLink
Cliftonn/an/aLinkCovered by Morenci Water Co
Carefree278.516.3LinkGets predominantly from Scottsdale
St. Johnsn/an/aLink
Parkern/an/aLink
Williamsn/an/aLink
Willcoxn/an/aLink
Piman/an/aLink
Star Valleyn/an/aLink
Colorado Cityn/an/aLink
Superiorn/an/aLink
Welltonn/an/aLink
Quartzsiten/an/aLink
Gila Bendn/an/aLink
Kearnyn/an/aLinkNo CCR on website
Springervillen/an/aLink
Huachuca Cityn/an/aLink
Miamin/an/aLink
Fredonian/an/aLink
Tombstonen/an/aLink
Mammothn/an/aLink
Patagonian/an/aLink
Duncann/an/aLink
Tusayann/an/aLinkLink on their website leads to dead page
Haydenn/an/aLink
Jeromen/an/aLink
Winkelmann/an/aLink
Arizona 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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