Mona planning commissioners review sewer, septic and pump options for proposed subdivision amid moratorium

Mona Planning and Zoning Commissioners spent a work session on Feb. 5, 2025, reviewing options for sewer and wastewater service at a proposed subdivision, including home-based ejector pumps, small pressurized discharge lines that would feed a gravity lateral, conventional septic tanks and an irrigation-company-funded pond. The discussion also touched on whether adding two lots to an earlier five-lot proposal would require a new application and how a city moratorium and pending water study affect the timeline.

The issue matters because the preferred wastewater solution affects lot layout, homeowner responsibilities, future road and sewer connections and public-safety and maintenance concerns raised by commissioners. Commissioners and staff discussed tradeoffs between short-term feasibility for the developer and long-term costs or liabilities borne by homeowners and the city.

Applicants and staff outlined four principal options: (1) individual home ejector or grinder pumps discharging through 1.5- to 2-inch lines that would be forced to a nearby gravity manhole; (2) conventional on-site septic systems; (3) a shared pond (described in the discussion as an irrigation-style retention pond) funded or managed in coordination with the local irrigation company and an HOA; and (4) a longer-term solution to extend or “loop” a public sewer line from First North or 550 East to reach the new lots so future connections could be gravity-fed.

Developer representative Richard (applicant) described a practical design under consideration: home-based grinder or ejector pumps with a 2-inch discharge that would feed into a 6-inch lateral (he said the plan would group three homes per 6-inch lateral), and placement of a manhole far enough from houses to meet local connection-distance requirements. A city staff member explained the local rule and related state code require connection when a public sewer is available within about 300 feet of the property boundary; commissioners discussed moving the manhole to meet that threshold if possible.

Commissioners and staff repeatedly raised concerns about putting pond maintenance on HOAs or homeowners. One commissioner said a pond “is just a HOA nightmare waiting to happen,” citing prior examples in town where ponds created ongoing maintenance calls and safety risks. The commission discussed that if a developer funds an irrigation-pond approach, the city could still inherit long-term problems if an HOA disbands or fails to maintain the pond.

Multiple participants described homeowner ejector pumps used elsewhere in the city and neighboring subdivisions. A commissioner noted that modern ejector/grinder systems include alarms and household-level enclosures; another commissioner replied that “there's nothing that replaces gravity,” describing past pump failures that caused basement backups in other developments. Participants distinguished large shared wet-well lift stations (serving multiple laterals) from in-home ejector pumps.

The developer said negotiations with neighbors have produced a possible dedicated right-of-way to extend the road to Lots 6 and 7, and that property owners on the opposite side of the proposed road have asked the developer to add two lots in exchange for right‑of‑way access. That change prompted questions from planning staff about whether the revised layout (from an earlier five-lot application to a proposed seven-lot layout) would require a new application or additional review; staff said they would check the municipal code and bring the question back to the commission.

Participants also discussed an irrigation-company alternative: the developer asked whether the subdivision could tap a private pressurized irrigation main or an existing 4-inch private irrigation pipe so that homeowners could use pressurized irrigation lines rather than build a new pond. Multiple speakers said the irrigation company had rejected several options and would not allow tapping the larger main; the developer reported the irrigation company had supported only the pond option among the choices presented.

Commissioners noted a current moratorium and a pending city water-study procurement that are intended to clarify service limits and inform development approvals. A planning commissioner said proposals for the water study were due next week; staff said the moratorium was intended to allow that study to inform service decisions. The moratorium and study are influencing whether staff or the commission will approve short-term measures such as multiple home pump systems in the near term.

Staff summarized procedural timing questions raised by the developer: the original submittal (for five lots) was filed in July and may be subject to a six-month application window; staff said they would confirm whether the application remains active and whether a new application is required if the plan adds lots. Staff also described the local Development Review Committee (DRC) and the new state-directed timelines for administrative review cycles; under the updated procedures, the DRC can handle approvals administratively in many cases and the city now has defined review-cycle timelines (the commission and staff said cycles vary by community size and the new rules are intended to shorten some review steps).

Next steps: planning staff said they will (1) research whether the change from five to seven lots requires a new application, (2) review the setback/300-foot connection rule and manhole placement options, (3) follow up with the irrigation company and the city’s water-study procurement team, and (4) have the DRC and staff report back to the commission in the coming weeks. The work session concluded with a motion to close the session on Feb. 5, 2025.

The discussion was advisory; no final land-use approvals were made during the work session.