The Arizona Corporation Commission maintains regulatory authority over private water companies and private wastewater companies throughout Arizona. There are approximately 400 individual water systems operated by nearly 350 companies under our jurisdiction. There are approximately 21 wastewater companies and 20 combination water and wastewater providers that we regulate. Multiple systems can be operated by the same utility company.

Several other agencies also have jurisdiction over aspects of running a reliable water system.  Questions related to water quality, water pollution or contaminants in drinking water should be directed to Arizona Department of Environmental Quality (ADEQ).  For information regarding these other agencies, visit our Frequently Asked Questions for helpful information to know more about how we regulate water and wastewater companies in Arizona.



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General Information

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National Association of Regulatory Utility Commissioners (NARUC)

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Water Rules


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ADWR Blue Ribbon Panel - Website 

 Blue Ribbon Panel Press - Jan 8, 2010

Curtailments & Moratoriums

Arsenic - FAQ's
ADEQ's Arsenic Master Plan

Water Conservation Tips


Water Companies with ACC Water Conservation Tariffs
The ACC sometimes requires a water company to implement best management practices (BMPs) selected from Arizona Department of Water Resources list of BMP's.  For more information, go to: