(TRI-VALLEY, Calif.) – Before winter rain starts pooling in streets or pushing creeks higher, Tri-Valley residents can take three useful steps:
Check the places they depend on,
Register for emergency alerts and
Decide how their household will respond if travel or power is disrupted.
The local details matter: emergency-alert systems, sandbag arrangements and maintenance contacts differ across Dublin, Pleasanton, Livermore, San Ramon and Danville.
If flooding is already threatening safety
Follow official protective instructions, stay out of floodwater and call 911 for a life-threatening emergency. Do not travel through flooding to collect sandbags. For more information see the National Weather Services webpage, During a Flood.
El Niño provides a reason to prepare, but it does not determine whether a particular neighborhood will flood. Zone 7 Water Agency cautions that even an exceptionally strong event does not guarantee heavy rainfall or flooding in the Tri-Valley. Residents still need to follow local forecasts and emergency instructions as individual storms develop. Learn more from the Zone 7 Water Agency.
El Niño provides a reason to prepare, but it does not determine whether a particular neighborhood will flood. Zone 7 Water Agency cautions that even an exceptionally strong event does not guarantee heavy rainfall or flooding in the Tri-Valley. Residents still need to follow local forecasts and emergency instructions as individual storms develop.
Start with your home—and the places you need to reach
Use FEMA’s Map Service Center to look up flood-hazard information by address. Check your home, workplace and other important locations, and ask your local floodplain or public works staff for help interpreting the map. FEMA’s mapping assistance line is 877-336-2627. Being outside a mapped high-risk area does not eliminate flood risk. The following websites have more information: FEMA map search instructions; NFIP mapping assistance; FEMA Map Service Center, and NFIP: What's your flood risk?
Also look at everyday drainage: where water collects, whether downspouts are blocked and whether a driveway or access road has flooded before. Contra Costa County advises residents to assess neighborhood drainage and plan an evacuation route before fast-rising water becomes a problem. This is discussed more by Contra Costa County's storm preparedness webpage.
A flood-hazard map and an evacuation-zone map serve different purposes. Flood mapping describes modeled hazards; evacuation zones help officials identify areas receiving protective instructions. Dublin directs residents to look up their evacuation zone at protect.genasys.com and register for alerts. Other sources of information include: the FEMA map search instructions, NFIP mapping assistance, FEMA Map Service Center, and Dublin's evacuation zones and shelter information.
Register for alerts before you need them
Dublin, Pleasanton and Livermore: Register mobile numbers and email addresses with AC Alert rather than assuming your cellphone is already enrolled. Use the AC Alert links in Dublin’s emergency-alert guidance or your own city’s emergency-preparedness page. Some regional emergency alert pages are: Dublin emergency alerts, Pleasanton Storm Watch, and the Livermore storm preparedness.
San Ramon and Danville: Register with the Community Warning System. CWS can deliver protective instructions by phone, text and email. It is intended for dangers requiring protective action, rather than routine traffic or awareness updates. CWS official overview, CWS registration and registration instructions can help users learn more.
Where registration allows, add locations important to your household, such as work or a child’s school, and keep contact information current. CWS allows additional locations and contact numbers. Additionally, check the National Weather Service Bay Area forecasts and warnings for the places you live and travel.
Weather alerts have their own meanings:
Flood watch: Conditions could produce flooding. Prepare and monitor updates.
Flood warning: Flooding is occurring or imminent. Take protective action.
Flash flood warning: Sudden flooding is occurring or imminent. People in flood-prone areas should move immediately to higher ground.
Flood advisory: Flooding may cause inconvenience and can become dangerous if precautions are ignored. NWS flood watch, warning and advisory definitions.
Read the location and instructions in each message. Follow evacuation orders promptly. Do not wait for another notification if rising water is already creating danger. See the NWS for more information.
Get sandbags early—and check before traveling
Local agencies publish different pickup arrangements. Supplies may change during storms, so check the city’s current guidance before making a trip. Sandbags do not guarantee a watertight barrier and should never delay evacuation or other protective action. The NWS and San Bernardino County Fire both offer more information.
Local Operations
Operations Services, 3333 Busch Road
Self-service sand and bags, 24 hours a day during the rainy season; bring a shovel.
Maintenance Service Center, 3500 Robertson Park Road; Fire Station 6, 4550 East Avenue; Fire Station 8, 5750 Scenic Avenue
Self-service; bring a shovel. City sites list six bags per household. Zone 7’s 100 North Canyons Parkway location lists ten.
City Corporation Yard, 5709 Scarlett Court, as listed by the city
City residents and businesses are asked to take ten bags or fewer.
A regional directory lists a different street number; confirm with Public Works at 925-833-6630 before traveling.
Central Park, Athan Downs Park, Sunny Glen Community Center area and San Ramon Sports Park
City stations are scheduled from November 2, 2026, or earlier if a storm is anticipated.
Bring a shovel; check city guidance for entrances and availability.
1000 Sherburne Hills Road
Town guidance asks residents to take no more than 20 bags. Bring a shovel if possible.
Residents of unincorporated Alameda County should check the county’s separate program. Its supplies are designated for unincorporated residents, have a five-bag household limit and are made available when the season’s first major storm is forecast. The Alameda County Public Works storm preparedness websites discusses this more.
Prepare for water, outages and disrupted routines
Before rain, clear private gutters and downspouts where it is safe to do so. Put leaves and yard waste in the proper containers. Report blocked public drains early. Do not enter floodwater or try to clear an obstruction during active flooding. Refer to the following websites: Pleasanton Storm Watch, Contra Costa County storm preparedness.
Renters should discuss recurring drainage problems and property protection with their landlord or manager. Businesses should identify how they will protect stock and equipment and notify employees if access is interrupted.
Check insurance now. Most homeowners and renters policies do not cover flood damage. National Flood Insurance Program coverage generally has a 30-day waiting period, with exceptions; ask an insurer about the policy and effective date that apply to you. This is discussed by the NFIP.
Gather food, water, essential medications and supplies for several days. Charge phones and power banks, keep flashlights accessible and write down important contacts. If someone uses powered medical equipment or refrigerated medication, make an outage plan with their medical provider. Portable generators belong outdoors, at least 20 feet from windows, doors and other building openings—not inside a home or garage. Visit the Contra Costa County storm preparedness website or the Ready.gov power-outage safety sheet.
Arrange help early if someone may need assistance carrying supplies or leaving home. Plan transportation for children, older relatives, household members with disabilities and pets. A listed potential shelter is not necessarily open: Dublin instructs residents to check current shelter announcements and availability. Learn more from the City of Dublin or Ready.gov.
Check the journey, not just the weather
Before commuting or collecting children, check 511 for regional traffic and transit alerts and Caltrans QuickMap for state-highway conditions, including I-580 and I-680. Check BART’s service advisories if traveling by train; BART notes that weather can cause delays. Useful resources for readers include: 511, Caltrans QuickMap, BART weather guide, and the BART service advisories.
Never drive around a barricade or enter a flooded road. Do not walk into floodwater to judge its depth. The National Weather Service warns that water can conceal washed-out pavement, electrical hazards and other dangers. Stay away from downed power lines and damaged electrical equipment; call 911 to report them. This is also discussed by the NWS and the City of Dublin.
Report problems through the right channel
Save the following contacts before the next storm. When conditions change, use current forecasts and official instructions to decide what to do next. For life-threatening emergencies, call 911. Online maintenance forms are for service requests; do not use them in place of emergency assistance.
Pleasanton
Public Works: 925-931-5500; MaintStar for routine requests
Police Dispatch: 925-931-5100
Livermore
City: 925-960-8100, weekdays, 8 a.m.–4 p.m.
City: 925-960-8160, weekends, holidays and after hours
Dublin
Public Works: 925-833-6630
Dublin Police Services: 925-462-1212
San Ramon
Public Works: 925-973-2800, business hours
Communications Center: 925-973-2779
Danville
Danville Connect or Maintenance Services: 925-314-3450
Police non-emergency line: 925-820-2144
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