Your WaterFlood and Stream ManagementWatershed and Environment

watershed.jpgWhat is a watershed?

A watershed is the land over which water flows into a common water body.

Bethany Reservoir and Lake Del Valle collect the water that flows across the land surrounding them. Limiting your impact on the watersheds will help to protect your drinking-water supplies.

The Alameda Creek Watershed consists of many streams and groundwater channels that converge and drain the region's stormwater runoff into Alameda Creek, which flows to the Bay. Covering about 700 square miles from Mt. Diablo in the north to Mt. Hamilton in the south, it is one of the Bay Area's largest watersheds.

Pollution Prevention Tips

When it comes to contamination that harms the watershed, our groundwater resources and the Bay, you are the solution! For tips on how to prevent stormwater contamination -- whether washing your car, controlling garden pests or disposing of old paint or other household items -- check out the Alameda Countywide Clean Water Program.

crks-to-bay-logoVolunteer Opportunities for Creek Cleanups

Zone 7 is participating in the Adopt a Creek Spot program in Livermore.  The program is looking for groups to adopt spots on a year-round basis.

Each September as part of the annual California Coastal Cleanup Day, Zone 7 typically assists the Valley's cities in organizing community cleanups of trash, old tires and other debris along several creeks. Annually, hundreds of pounds of trash and recyclable material, dozens of tires and such things as shopping carts, are pulled from our Valley's arroyos. To learn about upcoming volunteer opportunities, see the Calendar of Events.

Plastic Bag Ordinance Takes Effect in Alameda County

Plastic bags are one of the most common litter items found in our waterways, and plastic pollution is a growing threat to creeks, the ocean and marine life. Effective Jan. 1, 2013, grocery stores in Alameda County that sell packaged foods can no longer provide single-use plastic bags at checkout. Under an ordinance adopted by the county's Waste Management Authority, recycled content paper bags and reusable bags may be provided, but affected stores must charge a minimum 10 cents per bag. Consumers may still bring any type of bag to a store for their purchases, and are encouraged to do so. To learn more, go to


Zone 7 participates in efforts to protect the watershed through:

  • Participating in the Alameda Countywide Clean Water Program, a consortium of 17 local agencies, including the county and several of its cities, that uses public education and other means to reduce the amount of pollutants entering the creeks either directly or through storm drains into creeks.
  • Helping organize local volunteers for various creek cleanup events.
  • Providing programs in the schools and at various community events, (these Earth Day photos in Pleasanton include one of a stormwater model on display), thatstormwater.jpg earthday2007.jpgpromote a healthy watershed and teach about creek and storm-drain pollution prevention.
  • Working with the Alameda Creek Watershed Council, involving several local agencies, environmental groups, industries and organizations working to develop strategies to enhance and safeguard our local water resources.
  • Involvement in the South Bay Aqueduct Watershed Plan, part of an ongoing collaborative effort (also involving the Alameda County Water District and the Santa Clara Valley Watercoastal_cleanup_2007streamwise.jpg District) to, using state grant funding, identify vulnerabilities and develop best-management practices to address them.
  • Incorporating habitat restoration and other environmental benefits into our flood-protection program where possible.


For information on the watershed's recreational benefits, including at Lake Del Valle and the Sunol Regional Wildnerness, go to the East Bay Regional Park District web site.


To view Zone 7's main Watershed & Environment page, click here


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