During the month of November, Seattle Public Utilities will pick up extra bags of leaves.

From SPU’s site:

If not collected, leaves cause street flooding by clogging storm drains and pipes. By raking your leaves and keeping them out of streets and storm drains, you can reduce ponding and flooding.

To help keep storm drains clear, SPU offers its household waste customers free extra yard waste pick up in the month of November. Put fallen leaves into a paper or compostable lawn and leaf bag or a reusable container with a lid. Household food and yard waste customers can set out up to 10 extra bags of leaves (no food) for FREE each November collection day…

Please do not put leaves and other yard waste in plastic bags.