From Seattle Public Utilities:

SPU crews are planning to do a hydrant flow test tonight near 6537 35th Ave SW, between 11 PM and 5 AM. The test is conducted at night to minimize impacts to customers. Crews will run water from a hydrant to test the volume coming out of the pipe to ensure there is adequate fire flow protection.

Any time there is a disturbance in the water main, discolored water can happen. Customers can visit our website for information about discolored water. If the problem persists, customers can call Seattle Public Utilities’ 24/7 Operations Response Center at 206-386-1800.