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City staff warn Maple Grove's softening plan could sharply raise rates; council questions fairness of cost splits
Summary
Staff said lime softening proposed by Maple Grove could multiply customer rates and that Dayton could face disproportionate cost allocations for large Maple Grove treatment expansions. Council members signaled reluctance to accept steep increases without stronger protections or negotiated limits.
Dayton City staff told a council work session that a Maple Grove proposal to add lime softening to its treatment plant could greatly increase customer rates and complicate how Dayton and Maple Grove blend supply.
Staff presenter Jason Quisber said the softening technology Maple Grove is considering (lime softening, not salt softening) imposes significant capital and operational costs and produces byproducts that require environmental handling. "If they were to add the softening, it could be as much as a four-fold in user rates," Quisber said, adding that staff does not yet have a final Maple Grove decision and that the estimate is an early planning figure.
Council members repeatedly raised equity questions: several members asked why Dayton might be assessed a large portion of an expansion's cost when the city currently uses a small percentage of Maple Grove's capacity. One council member summarized the concern: Dayton could be charged for half of a treatment expansion while drawing only 5% of the supplier's peak volume.
Staff suggested several mitigations: negotiating explicit annual rate caps in any renewed contract, delineating service districts to avoid mixing waters with different chemistry, seeking grant funding to lower local shares of capital costs, and staging investments so that Dayton's obligations match the pace of growth. Council members said they expect staff to model rate impacts for households and for staff to bring back clearer scenarios showing how different contract terms and softening decisions would change year‑by‑year user bills.
The council did not take a vote; members asked staff to return with refined financial modeling and to wait for Maple Grove's near-term study of softening (Maple Grove plans to present more information early next year).
