Minnetonka consultants warn of large renewal peaks in 2040 and 2070; urge near‑term planning and funding

A draft 50‑year asset renewal and replacement plan for Minnetonka projects two major cost peaks and urges the city to prioritize the next 10–15 years of work to avoid costly emergency repairs.

Aaron Volmer, a consultant with AE2S, told the City Council that Minnetonka’s utilities and public infrastructure are aging together: the majority of water and sewer pipe was installed in the 1960s–1980s and many surface assets date from the 1970s. “Asset management is making the right decisions at the right time for the right reasons,” Volmer said, describing the study’s goal of extending asset life while reducing the risk of critical failures.

Volmer said the inventory includes 18 wells, eight water treatment plants, eight storage tanks, about 310 miles of water pipe, roughly 305 miles of sanitary sewer pipe, about 258 miles of city streets and roughly 100 miles of trails. AE2S’ model shows a steep increase in renewal needs beginning in the late 2030s, peaking around 2040 and again near 2070; the consultant estimated roughly $1.5 billion in horizontal assets and $629 million in vertical assets will require replacement over 50 years. In nearer terms, AE2S estimated about $70 million of vertical water, sewer and storm assets will require replacement in the next 15 years and hundreds of millions for roads, sidewalks and trails over the same horizon.

City staff and the consultant stressed that the long‑range numbers are projections, not final budgets. “Once you get past 15 years the picture gets foggy,” Volmer said, urging council to treat the plan as a living tool staff will update as more condition data, regulatory changes and technologies emerge.

Council members asked whether current capacity and population growth were factored into the analysis. Volmer said staff had worked with community development and the system is generally sized for current growth patterns, but “one‑off” projects and redevelopment could trigger targeted upgrades. Councillors also pressed on climate impacts and materials: Volmer said the industry is monitoring shifting precipitation patterns and regulatory issues such as PFAS but that the study uses established life‑expectancy tables for common materials; staff said they monitor research from the American Water Works Association and the EPA.

On costs, Volmer said emergency repairs typically run “20–25%” higher than planned replacements and that small localized break repairs can average in the tens of thousands of dollars, while catastrophic sinkhole events and large reconstructions are far costlier.

Finance director Darren Nelson told the council the city uses a mix of funding tools: property taxes and municipal state aid historically cover streets, while water, sewer and stormwater are supported by user fees and, when appropriate, debt. Nelson said staff will pursue grants and federal or state funding when available and that borrowing, bonding and targeted reserve contributions will be part of future financing conversations.

Council members welcomed the plan and urged stronger resident communications, staged investments and enhanced reserve building so future councils aren’t left with large unfunded obligations. Several council members asked staff to explore spreading work over more years and combining projects (for example, replacing underground utilities when streets are rebuilt) to reduce overall cost.

Staff noted the document is a draft; consultants and staff will incorporate council feedback and return with refined recommendations tied to upcoming capital and rate decisions.