Winona Wastewater System Improvements

Wastewater Treatment Facility and Collection System Improvements for the City of Winona

Heartland Engineering has been privileged to again partner with the City of Winona, Missouri.  Our firm has been entrusted to design and oversee significant upgrades to the wastewater treatment and collection infrastructures. The collection system, spanning 17.6 miles, primarily consists of 8-inch and 12-inch vitrified clay pipes (VCP), which have historically shown high susceptibility to stormwater infiltration due to fractures in the pipe. The City of Winona has faced challenges with stormwater management for years, increasing the strain on the Wastewater Treatment Facility (WWTF). The existing WWTF includes a 175,000-gallon-per-day oxidation ditch, secondary clarification basins, gravity sand filters, and an ultraviolet disinfection unit.

Heartland Engineering was responsible for the design, bidding, and construction administration of the $5.51-million dollar Phase I wastewater improvements initiative backed by the American Rescue Plan Act. This included extensive collection system repairs to reduce infiltration, new oxidation ditch rotors along with automated controls, replacement of the secondary clarifiers, the construction of a new headworks channel with mechanical screen and bypass, installation of a sludge flowmeter, and rehabilitation of the terminal lift station. Construction of the Phase I Project was completed in June 2026.

Our firm then assisted the city in applying for and obtaining a second funding package provided by the Missouri Department of Natural Resources State Revolving Fund (SRF) to fund additional improvements that had to be excluded from the scope of the ARPA project due to budget limitations. The Phase II Project includes additional treatment facility improvements such as the construction of a new lift station for return activated sludge & waste sludge, replacing the sand filters with a disc filtration system, replacing the in-channel UV disinfection system with an in-pipe UV system, and various repairs to the treatment facility office and lab building. The project also includes rehabilitation of existing wastewater lift stations, the replacement of old residential grinder pump stations, various sewer manhole repairs, and dig & replace work to repair badly damaged sections of sewer main.

Engineering design of the Phase II project was completed in the summer of 2026. The project will then be submitted to the Missouri Department of Natural Resources for permitting, with construction anticipated to begin in late 2026 or early 2027.