Watershed Map

A watershed is the land that water flows over or through on its way to a creek, delta, bay, or ocean. Everyone lives in a watershed, and everything that happens in the watershed affects water quality and habitat quality for fish, birds, and other living things. Pollution in distant parts of a watershed can be washed into storm drains, and cause problems downstream. Human activities can harm or improve the condition of a watershed, including its water quality, fish and wildlife, forests and other vegetation, and the quality of life for people who live there. Most of the stormwater runoff in San Mateo County eventually drains into the San Francisco Bay or the Pacific Ocean. There are over 80 watersheds in San Mateo County, 34 of them are in the 21 incorporated municipalities. Find yours below!