Report: MI Needs Nearly $40B Over 20 Years In Water Infrastructure Investment

(Source: MIRS.news, Published 10/28/2026) Michigan needs at least $39.6 billion in water infrastructure improvements over the next 20 years, plus roughly $860 million annually in ongoing costs, according to a new assessment warning that investment is falling short of the state’s needs.

The University of Michigan Water Center and Public Sector Consultants compiled more than 60 reports, surveys and analyses to assess drinking water, wastewater, stormwater, dams, household systems and source water protection.

Spread over two decades, the capital improvements and ongoing needs total approximately $2.8 billion annually. The report compares that with historical community capital spending of $1.14 billion a year, although that benchmark comes from Census Bureau data covering 2004–2013 rather than current spending.

The largest component is $27.3 billion for drinking water and wastewater infrastructure, including approximately $1.96 billion to replace 245,000 lead service lines.

Other estimated needs include $6 billion for stormwater infrastructure, $2.5 billion for wetland restoration and $980 million for dam rehabilitation.

Household systems carry additional costs: approximately $2.2 billion to replace an estimated 130,000 failing septic systems, plus $676 million annually for ongoing replacements. Testing private wells for PFAS would cost an estimated $600 million.

The assessment also identifies $181 million annually in water bill assistance for approximately 395,000 qualifying households.

Recent investments have helped, but researchers warn that much of the increase relied on temporary federal funding rather than sustained state revenue. The report estimates that the state’s Dam Risk Reduction Grant Program would need approximately 65 years at its recent funding pace to address the existing repair backlog, without accounting for additional deterioration or emergencies.

“Recent investments have been historic, but they were built largely on one-time federal money,” said Public Sector Consultants Senior Vice President Maggie Pallone in an announcement accompanying the report.

Demand for state assistance crosses party lines. Researchers found that 78 legislators representing 42 counties requested approximately $1.02 billion for 125 local water projects in the Fiscal Year 2027 budget. The final budget provided $27.9 million for those requests, less than 3% of the amount sought. That figure concerns the requested local projects, rather than all state water infrastructure funding.

Researchers caution that the overall estimate remains incomplete. Michigan lacks a statewide assessment of private well conditions, and major needs involving groundwater protection, flood mitigation and green stormwater infrastructure have not been fully priced.

The Charles Stewart Mott Foundation supported the assessment following a request from Senate Appropriations Chair Sarah Anthony (D-Lansing) for research to help guide water infrastructure investment. The report calls for sustained funding and better information about systems whose condition remains unknown.