Join thousands of community members throughout San Mateo County to take part in California’s largest volunteer event on September 16, 2017. San Mateo County coordinates CCD in conjunction with the California Coastal Commission, Ocean Conservancy, and many statewide and local partners (see below). Cleanups are held all over San Mateo County at beaches, creeks, waterways, parks and neighborhoods. This family-friendly event is a great opportunity to educate residents about litter and how to stop it from ending up in our local streets and waterways. Learn how and where to volunteer at the Coastal Clean Up Day website.