Thanks to Pete for the tip. Seattle Public Utilities has been notifying residents of Pigeon Point and Puget Ridge about a planned water outage for about 6 hours next Tuesday night, December 8th, 6 pm until midnight or so. The SPU outage map – which displays planned outages as well as emergencies – shows 200+ homes will be affected, but has no details of the reason for the outage. We asked SPU spokesperson Sabrina Register, who replied: “Seattle Public Utilities water crews will be installing a 12” isolation valve on a nearby water main. This work requires a temporary water outage for some customers in the area. Isolation valves allow smaller sections of a water main to be shut down (impacting fewer customers) when repairs and maintenance are needed in the future. They also provide an additional safety measure should an emergency water main shutdown need to occur.”