On July 1, 2026, Missouri American Water filed a request with the Missouri Public Service Commission (MoPSC) to review water and wastewater rates. The request is driven by nearly $1.6 billion in completed or planned system investments across the state from June 2025 to May 2028.

The MoPSC’s review of the company’s request is expected to take 11 months. Any new rates approved by the MoPSC are not expected to become effective until mid-2027.

Investments in the rate review include the replacement or installation of approximately 140 miles of aging water and wastewater pipes to help reduce main breaks and sewer overflows. Improvement projects also include the upgrades to treatment plants, storage tanks, wells, pumping and lift stations, fire hydrants, meters and more. See below for some examples of investments across the state:

• St. Louis County: South Plant intake relocation and replacement at a higher elevation mitigates flood risk while raw water pump replacements, emergency power generation and replacement of aging pump components improves operating efficiency and reduces service disruptions during extreme weather.
• Jefferson City: Construction of a new filter and chemical feed building renews critical infrastructure past its useful life and enhances water quality and treatment efficiency.
• St. Joseph: Water treatment plant expansion including a new clarifier and filters, rehabilitation of treatment units and upgrades to chemical feed system improves service reliability, safety, and efficiency.
• Joplin: Construction of a new carbon feed system, well site treatment upgrades and filter backwash improvements to increase safety and maintain consistent water quality and service reliability.
• Wastewater System Investments: treatment equipment upgrades. lift station construction and treatment enhancements to help improve treatment reliability and efficiency, as well as meeting environmental compliance.
• Statewide: Replacing an estimated 140 miles of water main, over 2,000 hydrants and over 100,000 meters will modernize infrastructure, improve system accuracy and efficiency, and enhance fire protection and service reliability.

Missouri American Water continues the replacement of customer and company lead service lines, with the goal of complete lead service line removal by 2030 in communities we serve. From 2020 to June 2026, approximately 25,000 customer lead service lines have been replaced at no direct cost to our customers.

Our proactive upgrades are an important part of providing safe and reliable service to families and businesses across the state. Continually investing in replacing aging infrastructure is key to protecting customers, the communities we serve, and the environment.

While costs to provide water and wastewater service continue to increase across the country, our investments and operational efficiencies help us provide high-quality service that continues to be an exceptional value.

For detailed information on proposed water and wastewater rates, click here.

For information on current water and wastewater rates approved by the MoPSC (effective May 2025), please see below.

• Schedule of Rates – Water
• Rules and Regulations – Water
• Wastewater Tariff

Water and Sewer Infrastructure Rate Adjustment (WSIRA)

In 2021 the Missouri Legislature passed a bill to help accelerate the replacement of aging pipes, pumps, and other critical components of water and wastewater systems by allowing for more timely recovery of investments. Click Here For more information on Missouri American Water WSIRA.

Current Water/Wastewater Rates And Rules/Regulations Tariff

Missouri American Water Rules and Regulations (Water)
Missouri American Water Rules and Regulations (Wastewater)
Missouri American Water Schedule of Rates (Water)
Missouri American Water Schedule of Rates (Wastewater)