Oak Harbor residents can learn the latest details of the planned wastewater treatment plant during a special public open house and City Council workshop next Wednesday.

The public open house, at the Oak Harbor Elk’s Lodge at 155 NE St., will run from 6 to 7 p.m. The workshop begins at 7 p.m.

The city will present its draft facilities plan, which will include project phasing and estimated costs.

The city’s consulting firm, Carollo Engineers, estimates the cost of the plant at $93.5 million, but phasing could spread the cost out over time.

In addition, updated user rate information will be available.

Cost of the project will likely be borne by residents who pay sewage treatment fees. An earlier study projected that sewer rates could double or even triple to fund the new plant.

City Council members and the mayor voted to site the plant in the vicinity of Windjammer Park, probably on the south side of Pioneer Way.