The city of Federal Way is classified as a "small" MS4.  MS4 stands for municipal separate storm sewer systems.  It is a conveyance system or set of storm drains, ditches, or pipes that collect and move stormwater, and are:

• Owned by a state, city, town, or other public entity that discharges to waters of the United States.
• Not a combined sewer, meaning stormwater and sewer are not within the same conveyance system.
• Not part of a sewage treatment plant or publicly-owned treatment works.

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