State awards largest-ever DNR loan to shore up St. Louis drinking water
The Missouri Department of Natural Resources has approved a record-breaking loan of $289 million to Missouri American Water to fund upgrades at the company’s St. Louis Central Water Treatment Plant. The department said the award comes from the Drinking Water State Revolving Fund and will cover the full cost of the planned improvements.
The funding package is the largest loan in the history of the Missouri DNR. Missouri American Water projected the work will be completed by December 2029. Company officials said the project will replace and upgrade several components of the plant to maintain compliance with drinking water standards.
- Loan amount: $289,000,000
- Source: Drinking Water State Revolving Fund (Missouri DNR)
- Planned completion: December 2029
- Estimated ratepayer interest savings: $140,000,000 over 20 years
State officials said the loan structure should reduce borrowing costs for Missouri American Water’s customers. The DNR estimates the funding will save the company’s ratepayers about $140 million in interest across the loan’s 20-year term.
"This amount is the largest loan in the history of the Missouri DNR," the department said in announcing the award.
For St. Louis residents, the project touches both public health and household budgets. Upgrades at a central treatment plant are intended to secure water quality and system reliability, while the low-interest state loan aims to blunt some of the long-term cost pressures that large capital projects can place on customers.
| Item | Detail |
|---|---|
| Loan origin | Missouri Drinking Water State Revolving Fund |
| Borrower | Missouri American Water |
| Purpose | Upgrade and replace components of the St. Louis Central Water Treatment Plant |
| Projected completion | December 2029 |
Across Missouri, state revolving funds have been used to help utilities manage expensive infrastructure projects while limiting rate shocks for customers. In St. Louis, where aging systems and regulatory standards regularly require expensive upgrades, securing low-cost financing can make major projects more feasible without shifting the full cost to households immediately.
Missouri American Water and the DNR did not provide additional details on the specific plant components targeted for replacement in the announcement. The company said the funding will allow it to proceed with the planned work to ensure drinking water continues to meet regulatory standards.
As the project moves forward, customers and local officials will watch timelines, construction impacts and any proposed changes to rates or service. For now, the loan represents a substantial state-backed investment in the region’s water infrastructure and a possible model for how large utilities can use revolving funds to manage costly upgrades.
