Yamhill committee weighs faster McMinnville hookup versus longer Hillsboro plan for water redundancy

YAMHILL — Members of the Yamhill Water Advisory Committee spent the bulk of their meeting weighing two regional supply options for the city: a near-term connection to McMinnville Water and Light (referred to in the meeting as “Mac Water and Light”) and a longer, more capital‑intensive hookup to Hillsboro.

Committee members said McMinnville representatives indicated an aggressive time frame, with one attendee noting McMinnville could deliver a connection “in roughly 2 years” under the right conditions; by contrast, members estimated a Hillsboro connection would take “at least 10 years.” The group emphasized those are planning estimates discussed in the meeting and not contractual commitments.

The committee framed the comparison around three questions they agreed to answer before the next meeting: How quickly can each connection be completed? What will construction cost the city? What will monthly user costs be once the city is buying treated water? Members asked staff to get firm answers from both utilities so the committee can forward a recommendation to city council.

Why it matters: Yamhill’s aging distribution and treatment infrastructure, limited local capture of Turner Creek impoundments and constraints on buildable land make a reliable, redundant source a high priority for growth, emergency response and economic development. Several members argued that regional connections could unlock grant and loan opportunities that a standalone local upgrade would not.

Key points from the meeting: - McMinnville advantage: Members said McMinnville representatives have senior water rights on the Willamette and could offer faster delivery, potential loaning/financing programs, and some grant eligibility. The committee recorded McMinnville as offering concrete options that could move “more quickly” than the Hillsboro path. The meeting also noted McMinnville had purchased material (pipe) when prices were lower, which could reduce procurement costs if McMinnville chose to sell or loan pipe for the project. - Hillsboro tradeoffs: Committee members described the Hillsboro route as more direct to reservoirs and possibly cheaper in the very long run, but slower to organize and dependent on larger regional planning and funding cycles. Members flagged potential System Development Charge (SDC) impacts; SDCs would typically be assessed on new development, not existing homeowners. - Carlton intertie and McMinnville routing: The group discussed routing McMinnville water through Carlton as a near‑term route. Brian Browning, public works director at Carlton, told the committee that a Carlton intertie is operationally attractive because the school district and local infrastructure already tie into that route: "The one thing about the connection point to Carlton is that we're tied at the hip with the school district," Browning said, noting the linkage helps prioritize reliability for essential services. - Blending study and chemistry: Members agreed a sampling/blending study is necessary before any intertie. The committee estimated a blending study sample and lab work could cost on the order of $1,100–$1,200, and that the study could determine whether chemical adjustments are required (for example, fluoride or other treatment differences) before waters are commingled. - Storage and hydraulics: A repeated question was where to locate reservoirs and whether booster pumps could substitute for reservoirs in some scenarios. Committee members noted the benefit of gravity feed on some McMinnville routes, and also that reservoir siting would influence long‑term operational flexibility.

Discussion versus decisions: The meeting produced no final decision or formal motion. The committee directed staff to ask McMinnville and Hillsboro for three items by the next meeting: (1) construction time frame for a full connection, (2) an estimate of capital/build costs to bring treated water to Yamhill, and (3) a ballpark estimate of monthly user charges if Yamhill hooked up today. The committee also asked staff to research blending study scope and costs.

Next steps and outlook: Committee members agreed to gather the requested data and present it to council. Several members urged proceeding with the fastest reasonable option while preserving flexibility to pursue both routes over time, should funding and engineering favor dual connections.

Sources and context from the meeting: Committee discussion and staff comments from the Yamhill Water Advisory Committee meeting, including remarks about McMinnville Water and Light, Hillsboro, Carlton, blending studies, and reservoir siting. The committee repeatedly stressed that engineering and legal review would be required before any formal agreement.