MADISON, WI. — The City of Madison has launched a sanitary sewer modeling study aimed at evaluating wastewater system capacity, supporting future development and helping guide long-term infrastructure investments.

The Campus, Downtown, and East Washington Ave Sanitary Sewer Study is the first phase of the city's new Sanitary Sewer Study Program. Carollo Engineers has been selected to lead the project, which is expected to be completed by summer 2027.

Modeling Will Help Plan Future Infrastructure

Madison officials said rapid population growth and redevelopment along major transportation corridors are increasing demands on the city's wastewater collection system. The study will evaluate current system performance, assess the impact of future development and identify improvements needed to maintain reliable sewer service.

Project work includes reviewing existing utility records and GIS data, implementing a three-month flow monitoring program, calibrating a sanitary sewer model using system performance data and developing capacity assessment maps.

“This program reflects Madison’s commitment to responsible infrastructure stewardship as our city continues to grow,” said City of Madison Engineering Division City Engineer Jim Wolfe. “By taking a corridor-based approach, we can better anticipate needs and keep wastewater service reliable for residents and businesses. The Campus, Downtown, and East Washington Ave corridor is the right place to start, and we look forward to expanding this program across the city.”

Study Supports Development and Capital Planning

While the primary objective is evaluating sewer capacity, the modeling effort may also help identify opportunities to reduce stormwater infiltration into the sanitary sewer system, potentially lowering treatment costs, minimizing overflow risks and improving system resilience during heavy rainfall.

Carollo Engineers will also assist the city in developing standardized modeling guidance that can be used for future sanitary sewer studies throughout Madison.

The completed model is expected to provide city planners with a practical tool for reviewing proposed developments, identifying infrastructure needs and prioritizing long-term capital improvements.

“We congratulate the City of Madison on launching its new Sanitary Sewer Study Program and taking a proactive, data-driven approach to planning for growth,” said Carollo Stormwater Technical Practice Lead Caroline Burger. “We look forward to partnering with City staff on a study that is not only technically rigorous but also designed to be practical and actionable, supporting consistent development review today and sound capital planning for years to come.”

To learn more visit carollo.com.