9:04 PM: Thanks to Maureen for the info: She reports “orange/brown water out of our cold-water faucets” near Admiral Way/59th. Any time you notice discolored water, report it to Seattle Public Utilities at 206-386-1800, which she’s doing now, and let us know too – back in 2016, it happened in so many areas, SPU eventually carried out a large-scale flush of water lines around the peninsula.
9:47 PM: Thanks to everyone who’s added comments about what they’re seeing/hearing. Here’s the SPU page about discolored (and otherwise problematic) water.
ADDED TUESDAY EVENING: SPU says they haven’t figured out the cause but they heard from 21 customers between 8 last night and 9:30 this morning. The water should have cleared up by now – let them know if it hasn’t.