Dayton reviews options to replace Maple Grove supply as 2006 contract nears 2036 expiration

Dayton City officials held a work session to review planning, cost and timing options for the South Dayton water system as the city's 2006 agreement with neighboring Maple Grove approaches expiration in 2036. Staff presenter Jason Quisber laid out four scenarios — Dayton builds its own system, a 50/50 split with Maple Grove, Maple Grove supplies 100% in perpetuity, or a mixed/delayed outcome in which Dayton pays for Maple Grove expansions and still later builds its own system — and flagged the large capital and rate risks each option raises.

Why it matters: The decision affects where Dayton invests tens of millions of dollars, who pays (developers versus current customers), and whether residents face sharp rate increases if Maple Grove proceeds with ambitious treatment or softening projects. Quisber said the city currently buys up to 5 million gallons per day from Maple Grove under the 2006 contract and that Dayton's present average demand is far below that peak allowance.

Quisber told council, “the treatment will, I'll say with relative certainty, happen,” and that lime softening is being considered but is less certain. He said staff modeled costs in 2025 dollars and estimated an ultimate overnight buildout of roughly $60 million for both north and south systems; split to show obligations that fall before 2036 (~$28 million) versus after (~$31–32 million). The south-side buildout under a pure-Dayton scenario was presented as roughly $49.5 million pre-2036 in staff's high-level estimate.

The staff presentation emphasized four practical trade-offs: building Dayton's own treatment and storage gives local control but requires large upfront bonding or grant-seeking; relying on Maple Grove reduces Dayton's capital burden but may expose Dayton residents to Maple Grove rate decisions and to changes in water quality; asking Maple Grove to expand and then later building Dayton's own system risks paying twice; and a negotiated middle path (shared investments and defined repayment terms) depends on Maple Grove's willingness to rework contract terms.

On finance, staff noted Dayton's water fund balance of about $10.5 million and that connection fees previously routed to Maple Grove historically helped pay infrastructure costs. Quisber said Dayton currently pays roughly $0.25 per 1,000 gallons to Maple Grove and charges customers about $4 per 1,000 gallons; staff estimates Dayton can produce water for roughly $1.25 per 1,000 gallons (production costs only). He said Maple Grove has signaled a 5% rate increase in 2026 with additional increases likely and that any major Maple Grove capital program could push rates higher for their customers — conditions that factor into Dayton's choice.

Council members repeatedly pressed staff about fairness — why Dayton might be asked to pay a large share of an expansion when city use is a relatively small fraction of Maple Grove's system — and about how to shield residents from sudden rate spikes. Quisber recommended planning for design and permitting to begin around 2029–2030 if Dayton intends to be operational on its own by the mid-2030s.

What happens next: Staff committed to circulate the presentation, refine financial scenarios, and pursue potential grant and bonding opportunities (staff has historically put water-tower requests on state bonding bills). Council did not vote; members asked staff to return with more detailed cost, timing and funding options, and said they would wait for Maple Grove's further information (including any decision to pursue softening) before setting a preferred path.