![]() ![]() The most populous Arizona city, Phoenix, has a hardness level of 230 Parts Per Million (PPM). Tucson has a water hardness level of 211 PPM, and Chandler's water is 292 PPM. The majority of AZ cities have a hardness level of between 210-350 PPM. This explains why almost every region in Arizona has very hard water.īullhead City has the hardest municipal water source in the state and is also the second highest recorded municipal hardness level we have located in the United States with 615 PPM. Depending on the location and depth of the well, the water hardness in these aquifers can range from 200-10,000 PPM. Groundwater is extracted from the Black Mesa and Navajo aquifers, using wells. ![]() Most of the water for public use comes from the Colorado River and groundwater sources known as aquifers. With only 7 inches of annual rainfall in the Phoenix metro area, surface water cannot be solely relied on. Water quality in Arizona is governed by the Arizona Department of Environmental Quality. ![]()
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