Public Safety Is the District’s Primary Concern

Many homes and businesses in Alameda County are located in floodplains. A floodplain is the natural area around a creek or river that floods periodically.

While the District works diligently to reduce the potential for flooding, heavy or prolonged rainfall causes increased flows in our creeks and channels. Flooding can still occur in some areas.

Important Phone Numbers

  • For Flood Emergencies: Dial 911
  • To Report Flooding of Major Creeks: 510-670-5500
  • For Sandbags in Hayward: 510-670-5500
  • For Sandbags in Dublin: 925-803-7007

Important Links

A segment of the restored Castro Valley Creek on a rainy day (Castro Valley, Zone 2)
A Publication for Unincorporated Alameda County Property Owners

What’s Your Flood Risk?

Fill in the One-Step Flood Risk Profile (red box in lower right) with your information for quick assessment.

For more information about flood insurance, visit or contact the National Flood Insurance Program (NFIP) at 1-800-638-6620. is a great resource for lots of information about flood risk and insurance.

Could I Be at Risk of Flood from a Dam Failure?

Though you may not live near a dam, you could be affected if a dam breaks. Inundation maps are available for most large dams in the Bay Area. To see if your property could potentially be flooded, visit Flooding Maps and Information from the Association of Bay Area Governments (ABAG).