Minnesota Supreme Court Heard Duluth Stormwater Fee Case
Business owners should track this pending ruling on utility fee calculations for potential liability impacts.
Updated on Oct. 14, 2026 in Utilities
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The Minnesota Supreme Court heard arguments in a class-action lawsuit filed by local businesses against Duluth regarding stormwater runoff fees. The litigation challenges the city's billing practices and seeks refunds for approximately 1,500 businesses dating back to 2015.
Why it matters
The ruling will determine whether Duluth's method for calculating stormwater charges—based on impervious surface area—was applied equitably or if specific businesses were overcharged. For operators, the outcome sets a precedent for how municipalities manage and justify utility rate structures.
The lawsuit involves roughly 1,500 businesses seeking refunds for fees paid since 2015, with the city estimating potential total costs could reach 20 times the $1 million currently at issue.
The players
Moline Machinery LLC
A plaintiff in the class-action lawsuit challenging municipal utility billing.
Glass Merchant Inc.
A plaintiff in the class-action lawsuit challenging municipal utility billing.
Minnesota Supreme Court
The state's highest judicial body responsible for setting legal precedents on municipal authority.
Duluth
A municipal government body responsible for public utility management and fee setting.
The details
The dispute centers on the city's use of an Equivalent Residential Unit (ERU) calculation, which determines fees based on a property's impervious surface area and projected sewer discharge. Plaintiffs allege that Duluth overcharged certain commercial entities while offering discounts to others, creating an uneven financial burden. The city modified its ERU value in 2024, but the legal debate continues over the historical application of the prior fee system.
Timeline
2015: Refund claims date back to this year.
2021: The class-action lawsuit was initiated.
2024: Duluth adjusted its ERU value.
October 13, 2026: The Minnesota Supreme Court heard oral arguments.
Coming months: The court is expected to issue a written ruling.
Market Landscape
This hearing follows the Minnesota Court of Appeals reversal of the initial district court dismissal of the case. The outcome will likely influence how other municipalities defend their utility fee methodologies against commercial billing challenges.
Operators in Duluth should monitor the upcoming ruling to determine if future fee adjustments are required or if they are eligible for refunds. Firms in other cities should audit their own utility billing statements to ensure their property's impervious surface area calculations align with local municipal ordinances.
The takeaway
The case highlights the importance of scrutinizing municipal utility rate structures, particularly those tied to complex ERU calculations. Business owners should review current stormwater billing records to track how changes in impervious surface assessment impact monthly overhead costs.
Further reading
For context on infrastructure and utility management, see Utilities.
Source note: This article includes information reported by Duluth News Tribune.
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