San Bruno, California climate resilience brief

Priority hazards

• Wildfire and smoke exposuremedium confidence
• Atmospheric-river urban flooding and slope failuresmedium confidence
• Drought, heat, and water-supply reliabilitymedium confidence

Exposure and vulnerability

Priority groups

children in San Bruno schools, older adults, renters without cooling or filtration, outdoor workers and transit-dependent residents

Assets

I-280 and US-101 access, BART/Caltrain station area, schools and civic facilities, culverts/storm drains, regional water district connections

Use current local exposure, public health, infrastructure, and social vulnerability data before acting.

Adaptation options

• Sweeney Ridge/Skyline WUI home-hardening and evacuation packageFocus on highest-risk hillside parcels; local ordinance access and homeowner participation are feasible; verify CAL FIRE maps.Cost: medium-high · Benefit: Reduces structure ignition, evacuation delay, smoke disruption, and insurance stress.
• Clean-air cooling resilience hubs at schools/library/community facilitiesFacilities have suitable electrical rooms/roofs; agreements with school district and city are secured.Cost: medium · Benefit: Protects residents during wildfire smoke, heat, and power shutoff events while supporting emergency communications.
• Atmospheric-river drainage, culvert, and slope stabilization programHydraulic modeling identifies repeat bottlenecks; Caltrans/rail coordination is possible at crossings.Cost: medium-high · Benefit: Cuts road closures, nuisance flooding, landslide cleanup, and business/transit disruption.

Cost and benefit ranges are planning estimates, not procurement-ready budgets.

Implementation timeline

Short term

• Map Sweeney Ridge WUI parcels, drainage hotspots, and clean-air shelter gaps using Cal-Adapt, CAL FIRE, and San Mateo County data.
• Adopt mutual-aid operating checklists for smoke, atmospheric rivers, and public safety power shutoff risk at schools and civic hubs.

Mid term

• Construct first-phase culvert/inlet upgrades on hill-to-El Camino Real routes and harden one San Bruno clean-air cooling hub.
• Launch homeowner defensible-space, roof-vent, and vegetation grants for Skyline/I-280 hillside blocks.

Long term

• Bundle drainage, pavement, and green infrastructure in capital improvement plans for US-101/BART/Caltrain access areas.
• Create a recurring resilience O&M fund with regional water districts, schools, and county emergency partners.

Funding windows

• CAL FIRE Wildfire Prevention Grantsstate grant · Match: often 0-25%; verify NOFO · Award: $100k-$5M varies by cycle · O&M: limited; mainly project delivery, planning, outreach
• FEMA Building Resilient Infrastructure and Communities or HMGPfederal hazard mitigation grant · Match: typically 25% nonfederal, with exceptions · Award: $500k-$10M+ depending on benefit-cost and state priorities · O&M: generally no routine O&M
• California State Water Resources Control Board / DWR stormwater and water resilience fundsstate revolving/grant finance · Match: varies; disadvantaged community terms may differ · Award: $250k-$10M varies · O&M: sometimes planning/design; routine O&M limited

Decision triggers

• If Air Quality Index forecast for San Bruno reaches 151+ for wildfire smoke or CAL FIRE incident threatens Sweeney Ridge/Skyline WUIThen Open clean-air rooms at designated San Bruno schools/civic hubs, pause outdoor school activities, notify hillside blocks, and log costs for reimbursement.
• If NWS Bay Area issues flood watch/warning or 24-hour rainfall forecast exceeds local drainage design threshold for Skyline-to-El Camino corridorsThen Clear priority inlets, stage barricades near repeat ponding sites, inspect culverts, and pre-position public works crews at I-280/US-101 access routes.
• If Regional water districts declare drought stage or heat advisory overlaps with public safety power shutoff riskThen Activate water-use messaging, check backup power at cooling hubs, prioritize welfare checks, and suspend nonessential irrigation.

Evidence and sources

• San Bruno has locally meaningful WUI/smoke exposure because dense neighborhoods meet open-space ridge terrain.expert inference; verify with CAL FIRE FHSZ/WUI maps and San Mateo County LHMP
• Atmospheric rivers can create drainage bottlenecks from hillside roads toward transit and highway corridors.expert inference; verify with San Bruno Public Works storm drain inventory, NWS Bay Area records, and Caltrans drainage data
• Drought and heat planning should use regional supplier data rather than city-only assumptions.expert inference; verify with regional water districts Urban Water Management Plans and Cal-Adapt projections

Governance and verification

Steps

• San Bruno Public Works leads a 6-month hotspot map for WUI, drainage, and shelter assets.
• City Manager and San Mateo County Emergency Management execute smoke/heat/flood activation MOUs with schools.
• Finance lead packages CAL FIRE, FEMA/Cal OES, and State Water Board/DWR applications into one 3-year capital pipeline.

Partners

San Bruno Public Works / City Manager emergency operations lead, San Mateo County Department of Emergency Management and hazard mitigation staff, CAL FIRE / local fire district for Sweeney Ridge WUI prevention, San Bruno Park School District and regional water districts for shelters and drought actions

Priority sites

Sweeney Ridge/Skyline/I-280 hillside neighborhoods exposed to wildfire, smoke, evacuation, and public safety power shutoff risk, Lowland drainage and transit access near El Camino Real, San Bruno BART/Caltrain, and US-101 exposed to atmospheric-river flooding, Schools, library/community center, and civic facilities suitable for clean-air cooling hubs during smoke, heat, and outages

Equity approach

Prioritize free shelter access, multilingual alerts, and grants that do not require large homeowner upfront cash.

Metrics

number of WUI parcels hardened, linear feet of culvert/drainage upgraded, shelter seats with clean air and backup power, hours of road closure avoided, AQI/heat event activation time