Oak Harbor city officials are asking residents to conserve water next Tuesday as the Anacortes Water Treatment Plant has scheduled a complete shutdown of its drinking water plant.

About 99 percent of the Oak Harbor’s drinking water is piped in from the treatment plant on the Skagit River in Mount Vernon. The plant also supplies water to the Navy base.

The plant is being shut down from 4 a.m. to 2 p.m. Tuesday, May 1 as the existing 42-inch raw water line is connected to the new treatment building being constructed.

The Oak Harbor Water Division will be prepared for this shutdown with all reservoirs filled and standby wells ready, if needed. Water customers shouldn’t experience any interruption in water service, but city officials are encouraging people to conserve water because of the length of the shut down.