Water and Sewer rates are regulated by the Missouri Public Service Commission. These rates are based on the actual costs of water treatment and delivery, and sewer collection and treatment. 

To establish new rates, MAWC files an application with the Public Service Commission. This begins an 11 month process known as a “rate case.” Missouri PSC Staff and other parties study and evaluate the appropriateness of MAWC’s costs of construction, maintenance, operation, administration and financing. Once the studies are complete, MAWC, PSC Staff, and other parties present any differing conclusions before the Public Service Commission. After evaluating all the evidence over 11 months, the Public Service Commission issues a final decision establishing rates they deem just and reasonable. 

Rates can vary based on the cost of providing service in each of the communities we serve. Before it reaches your home or business, water is treated through an intricate treating and testing process to help ensure it meets or surpasses rigorous drinking water quality standards.


Missouri American Water filed an application to establish new rates on June 30, 2017. After the 11 month evaluation period, we received our current rate order from the Missouri Public Service Commission on May 2, 2018. The new rates were approved on May 15, 2018 and are effective May 28, 2018.

Click here for a summary of water rate changes
Mexico inclining block rates
Click here for a summary of sewer rate changes

The company's investments in water and sewer system improvements are the primary driverbehind this rate change. From February 2016 through December 2017, Missouri American Water invested over $250 million in water and sewer infrastructure statewide. These improvements to local water and sewer plants, pumps and pipes are in service -- helping to enhance service quality, reliability, environmental performance, public health and fire protection for customers.

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Schedule of Rates – Water
Rules and Regulations – Water
Sewer Tariff