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Water Hardness in Missouri Cities

Water hardness in Missouri, characterized by the amount of dissolved minerals such as calcium and magnesium, can significantly differ among various cities across the state due to its varied geological landscapes. Situated in the Midwest of the U.S., Missouri’s water hardness levels reflect the geological diversity within the state.

Across Missouri, water hardness can range from moderately soft to very hard, depending on the geological makeup of the area and the source of the water supply. For example, regions with limestone bedrock, such as those in central and southern Missouri, often have harder water due to the high mineral content. In contrast, areas with more sandstone or shale bedrock may experience softer water.

The variation in water hardness throughout Missouri influences not only the taste and aesthetics of the water but also the efficiency of soaps and detergents, plumbing maintenance, and the lifespan of appliances that utilize water. Given the state’s geological diversity, water hardness is not uniform, highlighting the need for localized water treatment solutions and ongoing monitoring of water quality.

In the provided data, the water hardness levels show substantial variations across different cities in Missouri. Among the cities for which data is reported, the highest water hardness level is recorded in Park Hills with a hardness of 565.0 ppm, 33.0 gpg. Conversely, the city with the lowest recorded water hardness level is Kennett, reporting a hardness of 77.0 ppm, 4.5 gpg.

CityHardness ppm (mg/L)Hardness gpgInformation SourceNotes
Kansas City280.016.4Link
St. Louis146.08.5Link
Springfield142.58.3Link
Columbia210.012.3Link
Independence137.08.0Link
Lee’s Summit131.07.7Link
O’Fallon203.011.9Link
St. Joseph219.012.8Link
St. Charles127.07.4Link
Blue Springs141.08.2Link
St. Peters173.010.1Link
Florissant146.08.5LinkCovered under St. Louis
Joplin163.09.5Link
Chesterfield146.08.5LinkCovered under St. Louis
Wentzville296.017.3Link
Jefferson City140.08.2Link
Cape Girardeau123.07.2Link
Wildwood319.018.6Link
University City146.08.5LinkCovered under St. Louis
Ballwin265.015.5Link
Liberty169.09.9Link
Raytown131.07.7Link
Kirkwood146.08.5LinkCovered under St. Louis
Maryland Heights146.08.5LinkCovered under St. Louis
Gladstone104.06.1Link
Grandview404.023.6Link
Hazelwood146.08.5LinkCovered under St. Louis
Belton280.016.4LinkBuys from Kansas City
Raymore141.08.2Link
Nixa190.011.1Link
Webster Groves146.08.5LinkCovered under St. Louis
Ozark189.511.1Link
Sedalia244.514.3Link
Arnold146.08.5LinkPurchases from St. Louis
Rolla381.022.3Link
Warrensburg222.013.0Link
Republic156.59.1Link
Creve Coeur146.08.5LinkCovered under St. Louis
Ferguson146.08.5LinkCovered under St. Louis
Farmington356.020.8Link
Manchester146.08.5LinkCovered under St. Louis
Kirksville133.07.8Link
Lake St. Louis146.08.5LinkCovered under St. Louis
Hannibal183.010.7Link
Clayton210.012.3LinkCovered under St. Louis
Poplar Bluff99.95.8Link
Sikeston174.510.2Link
Grain Valley141.08.2Link
Overland146.08.5LinkCovered under St. Louis
Carthage153.59.0Link
Jackson307.017.9Link
Lebanon195.511.4Link
Washington253.014.8Link
Moberly139.08.1Link
Marshall126.07.4Link
Troy262.015.3Link
Webb City171.010.0Link
Dardenne Prairie235.013.7Link
St. Ann146.08.5LinkCovered under St. Louis
Jennings146.08.5LinkCovered under St. Louis
Branson122.07.1Link
Festus90.35.3Link
Fulton296.517.3Link
Neosho166.09.7Link
Union244.514.3Link
Crestwood146.08.5LinkCovered under St. Louis
West Plains228.013.3Link
Eureka230.513.5Link
Mexico300.017.5Link
Town and Country146.08.5LinkCovered under St. Louis
Bridgeton146.08.5LinkCovered under St. Louis
Bolivar216.512.6Link
Maryville125.07.3Link
Kearney135.07.9Link
Bellefontaine Neighbors146.08.5LinkCovered under St. Louis
Excelsior Springs112.06.5Link
Smithville116.06.8Link
Kennett77.04.5Link
Harrisonville122.07.1Link
Ellisville146.08.5LinkCovered under St. Louis
Monett132.57.7Link
Clinton152.08.9Link
Richmond Heights146.08.5LinkCovered under St. Louis
Des Peres146.08.5LinkCovered under St. Louis
Sunset Hills146.08.5LinkCovered under St. Louis
Chillicothe120.07.0Link
Ladue146.08.5LinkCovered under St. Louis
Warrenton255.014.9Link
Pleasant Hill141.08.2Link
Park Hills565.033.0Link
Perryville205.512.0Link
Olivette146.08.5LinkCovered under St. Louis
Cameron156.09.1Link
Oak Grove131.07.7Link
Carl Junction171.010.0Link
Nevada95.55.6Link
Maplewood146.08.5LinkCovered under St. Louis
Brentwood146.08.5LinkCovered under St. Louis
Berkeley146.08.5LinkCovered under St. Louis
Dexter195.011.4Link
Top 100 Missouri 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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