Missouri American Water, a subsidiary of American Water (NYSE: AWK), filed a rate request with the Missouri Public Service Commission on July 1, 2026, seeking approval for new rates tied to approximately $1.6 billion in water and wastewater system investments planned from June 2025 through May 2028.

The filing covers infrastructure serving more than 1.7 million people across 30 counties in Missouri. Planned work includes the replacement of approximately 140 miles of aging pipeline, upgrades to storage tanks, wells, pumping stations, hydrants, meters and wastewater plants, lead service line replacements, and treatment facility improvements to address regulatory requirements including PFAS contamination.

If approved as filed, the average residential customer in St. Louis County using 5,900 gallons per month would see a bill increase of approximately $23 per month. Customers outside St. Louis County using 4,500 gallons per month would see an increase of about $15 per month.

Specific projects cited in the filing include a South Plant intake relocation in St. Louis County to reduce flood risk, a new filter and chemical feed building in Jefferson City, a water treatment plant expansion in St. Joseph, and a new carbon feed system in Joplin.

"These investments strengthen service reliability and enhance water quality—from treatment to tap—while reflecting our employees' ongoing commitment to the health and safety of the communities we proudly serve," said Rich Svindland, President of Missouri American Water.

The MoPSC review process can take up to 11 months, with customers able to submit written comments and attend public input hearings. All rate changes require MoPSC approval. If approved, new rates could take effect in June 2027.