Data sources and methods

See what StayReady uses and how

Explore the official public map layers, guidance, and local plans used by StayReady, an independent educational tool. Each entry explains what the source supports, where it applies, and what still needs review.

26registered sources
8mapped data sources
7guidance sources
15jurisdictions covered
How to read this page

Official source does not mean every integration is final

StayReady separates the authority of a source from the review status of its use in the product. A source-link review date confirms that the cited page was checked; it is not the dataset's publication or effective date.

Mapped hazard data
Used for address-level layer checks or geographic context.
Preparedness guidance
Used for actions, definitions, and regional information.
Integration under review
The source is official, but StayReady's extraction or local copy is still provisional.
Verify directly

Open the official tools

Use these agency pages for current source information, official map viewers, and notices.

FEMA flood viewer CAL FIRE severity zones CGS EQ Zapp USGS earthquake program
Mapped dataset registry

Edition, freshness, and human review are separate

Provisional datasets are withheld in production until a named reviewer approves the exact edition.

8 datasets
National Flood Hazard Layer Alameda County snapshot Federal Emergency Management Agency Provisional
Edition
Alameda County NFHL 06001C_20260525
Source checked
2026-07-27
Dataset effective
Panel-specific; package snapshot 2026-05-25
Human reviewed
Not approved

Permitted claim

After named human approval, report the exact FEMA flood-zone category returned at the selected point and separately state whether it is an SFHA.

Prohibited claims

  • A non-match does not establish overall flood risk for the property.
  • This is not a parcel, insurance, elevation-certificate, or building-specific determination.
Open authoritative source
CAL FIRE FHSZ applicability snapshots California Department of Forestry and Fire Protection Provisional
Edition
Effective SRA 23_3 + 2025 LRA recommendations + responsibility areas 26_1
Source checked
2026-07-27
Dataset effective
SRA effective 2024-04-01; LRA recommendations released 2025; responsibility areas 26_1 as of 2026-04-09
Human reviewed
Not approved

Permitted claim

After named human approval, report an effective SRA severity match. LRA output may be described only as a 2025 CAL FIRE recommendation unless ordinance-level adoption evidence is recorded.

Prohibited claims

  • A non-match does not mean wildfire, smoke, ember, evacuation, or power-shutoff impacts are impossible.
  • The layer does not predict when a fire will occur or the damage a specific building will experience.
Open authoritative source
Mapped fault traces local GeoJSON snapshot United States Geological Survey and contributing California Geological Survey records Provisional
Edition
Lineage unverified — withheld
Source checked
Not recorded
Dataset effective
Not verified
Human reviewed
Not approved

Permitted claim

Withheld until agency ownership, edition, lineage, and official-viewer comparison receive named human approval.

Prohibited claims

  • Fault proximity is not Alquist-Priolo zone membership.
  • Fault proximity does not determine shaking, liquefaction, landslide, building damage, or overall earthquake safety.
Open authoritative source
CGS Alquist-Priolo Earthquake Fault Zones California Geological Survey Provisional
Edition
CGS published service, 2025 metadata
Source checked
2026-07-26
Dataset effective
2025
Human reviewed
Not approved

Permitted claim

After named human approval, report only whether the selected point intersects the returned regulatory-zone polygon.

Prohibited claims

  • This layer does not determine general earthquake risk or predict shaking damage.
  • A non-match does not establish overall earthquake, fault-movement, or seismic risk.
  • This is not a site-specific engineering, legal, insurance, disclosure, or property determination.
Open authoritative source
CGS Liquefaction Zones California Geological Survey Provisional
Edition
CGS published service, 2025 metadata
Source checked
2026-07-26
Dataset effective
2025
Human reviewed
Not approved

Permitted claim

After named human approval, report only whether the selected point intersects the returned regulatory-zone polygon.

Prohibited claims

  • A mapped match does not mean liquefaction or damage is guaranteed.
  • A non-match does not establish that ground failure cannot occur.
  • This is not a site-specific geotechnical, engineering, legal, insurance, or property determination.
Open authoritative source
CGS Earthquake-Induced Landslide Zones California Geological Survey Provisional
Edition
CGS published service, 2025 metadata
Source checked
2026-07-26
Dataset effective
2025
Human reviewed
Not approved

Permitted claim

After named human approval, report only whether the selected point intersects the returned regulatory-zone polygon.

Prohibited claims

  • This layer is not a general landslide forecast and does not predict when slope movement will occur.
  • A non-match does not establish overall landslide or slope-hazard risk.
  • This is not a site-specific geotechnical, engineering, legal, insurance, or property determination.
Open authoritative source
California Tsunami Hazard Areas California Geological Survey Provisional
Edition
CGS current published tsunami hazard-area service
Source checked
2026-07-26
Dataset effective
Not verified
Human reviewed
Not approved

Permitted claim

After named human approval, report only whether the selected point intersects a returned evacuation-planning hazard-area polygon.

Prohibited claims

  • This result is for evacuation and response planning, not a legal or property disclosure determination.
  • A non-match does not establish overall tsunami, coastal flooding, access, utility, or indirect-impact risk.
  • This is not a live warning or emergency evacuation order.
Open authoritative source
DSOD Approved Dam Inundation Boundaries as of October 1, 2025 California Department of Water Resources, Division of Safety of Dams Provisional
Edition
Approved inundation boundaries as of October 1, 2025
Source checked
2026-07-26
Dataset effective
2025-10-01
Human reviewed
Not approved

Permitted claim

After named human approval, report only whether the selected point intersects a published hypothetical inundation scenario boundary.

Prohibited claims

  • This mapped planning data does not predict that a dam failure will occur or estimate its probability.
  • A non-match does not establish safety from flooding, infrastructure failure, indirect impacts, or evacuation disruption.
  • Published boundaries are approximate, may omit federal dams or redacted information, and may change as DSOD approves updated maps.
  • Actual evacuation zones, routes, timing, and instructions come from local emergency officials.
  • Do not use LHMP or EOP screenshots for address-level dam inundation conclusions.
Open authoritative source
Source registry

Browse data and guidance

Search by agency, hazard, place, or source name.

Mapped hazard data Official source; integration under review

Federal Emergency Management Agency

National Flood Hazard Layer

Flood
Geographic scope
United States, including Alameda County
How StayReady uses it
Address-point flood-zone check and map context.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

The local snapshot is provisional pending named human verification against the official FEMA viewer. The app checks the saved address point against the loaded polygon layer; this is not a parcel determination.

Source type: Gis Polygon Layer

Open official source
Mapped hazard data Official source; integration under review

CAL FIRE

Fire Hazard Severity Zones

Wildfire
Geographic scope
California, including Alameda County
How StayReady uses it
Address point wildfire-zone check and map display.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

The local snapshot is provisional pending named human verification against the official CAL FIRE viewer. A point match is scoped only to the loaded Fire Hazard Severity Zone polygons and does not determine building safety or capture smoke, evacuation, ember, road, or power-shutoff impacts.

Source type: Gis Polygon Layer

Open official source
Mapped hazard data Official source; integration under review

United States Geological Survey

Fault and earthquake information

Earthquake
Geographic scope
United States, including Bay Area context
How StayReady uses it
Mapped fault proximity check, map display, and live-earthquake context.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

The local fault snapshot is provisional pending named human verification. Approximate address proximity is contextual only and does not determine regulatory zone membership, shaking, liquefaction, landslide, building damage, exposure, or safety.

Source type: Gis And Live Data

Open official source
Mapped hazard data Official source; integration under review

California Geological Survey

CGS Alquist-Priolo Earthquake Fault Zones

Earthquake
Geographic scope
California, including mapped Alameda County areas
How StayReady uses it
Address-point check for mapped surface fault rupture regulatory zones.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

Provisional until human verification against the official CGS regulatory maps viewer. This is surface fault rupture zone evidence, not a general earthquake-risk or shaking-damage determination.

Source type: Official Gis

Open official source
Mapped hazard data Official source; integration under review

California Department of Water Resources, Division of Safety of Dams

DSOD Approved Dam Inundation Boundaries

Dam Failure
Geographic scope
California, with address checks limited to Alameda County
How StayReady uses it
Address-point intersection and map display for published hypothetical dam-failure inundation scenarios.
Source link reviewed
June 15, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

Official mapped planning data, not a prediction. No address-level conclusions are drawn from LHMP or EOP screenshots. Actual evacuation instructions come from local emergency officials.

Source type: Official Gis

Open official source
Mapped hazard data Official source; integration under review

California Geological Survey

CGS Liquefaction Zones

Earthquake
Geographic scope
California, including mapped Alameda County areas
How StayReady uses it
Address-point check for mapped liquefaction regulatory zones.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

Provisional until human verification against the official CGS regulatory maps viewer. A match does not guarantee liquefaction; a non-match is not proof against ground failure.

Source type: Official Gis

Open official source
Mapped hazard data Official source; integration under review

California Geological Survey

CGS Earthquake-Induced Landslide Zones

Earthquake Landslide
Geographic scope
California, including mapped Alameda County areas
How StayReady uses it
Address-point check for mapped earthquake-induced landslide regulatory zones.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

Provisional until human verification against the official CGS regulatory maps viewer. This is not a general landslide forecast.

Source type: Official Gis

Open official source
Mapped hazard data Official source; integration under review

California Geological Survey

California Tsunami Hazard Areas

Tsunami
Geographic scope
Mapped California coastal communities, including Alameda County shoreline areas
How StayReady uses it
Address-point check for mapped tsunami evacuation and response-planning areas.
Source link reviewed
June 12, 2026
Review status and limitations

Official source; integration under review. The source is official. StayReady's extraction or map integration remains provisional.

Provisional until human verification against the official CGS tsunami viewer. This is planning evidence, not a live warning, legal disclosure, or all-coastal-flooding determination.

Source type: Official Map

Open official source
Preparedness guidance Official guidance; source link checked

Alameda County

Alameda County Emergency Site

Wildfire Flood Earthquake All
Geographic scope
Alameda County
How StayReady uses it
Countywide preparedness and source transparency.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

Countywide official emergency resource used for general preparedness guidance.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

City of Berkeley

Fire Weather and Evacuation

Wildfire
Geographic scope
Berkeley
How StayReady uses it
Berkeley wildfire evacuation and fire-weather guidance, especially for hills and Fire Zone context.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

Official Berkeley page says residents in the Berkeley Hills should leave before a fire starts when the Fire Department declares Extreme Fire Weather, and all residents should use emergency alerts and evacuation planning.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

Ready.gov

Build A Kit

Wildfire Flood Earthquake All
Geographic scope
United States
How StayReady uses it
Preparedness action guidance.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

General emergency kit guidance.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

Ready.gov

Make A Plan

Wildfire Flood Earthquake All
Geographic scope
United States
How StayReady uses it
Household planning guidance.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

General household emergency planning guidance.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

Ready.gov

Floods

Flood
Geographic scope
United States
How StayReady uses it
Flood preparedness and response wording.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

Used for flood action guidance.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

Ready.gov

Earthquakes

Earthquake
Geographic scope
United States
How StayReady uses it
Earthquake preparedness wording.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

Used for earthquake action guidance.

Source type: Official Guidance

Open official source
Preparedness guidance Official guidance; source link checked

Ready.gov

Recovering from Disaster

Wildfire Flood Earthquake All
Geographic scope
United States
How StayReady uses it
Recovery readiness questions and limitations.
Source link reviewed
June 4, 2026
Review status and limitations

Official guidance; source link checked. StayReady checked the cited official page. This does not mean an external expert or agency approved StayReady's wording.

Used to include recovery planning in StayReady preparedness guidance.

Source type: Official Guidance

Open official source
Local context

Local plan coverage

Shared regional plans appear once with all covered jurisdictions. Plan context does not replace an address-level map check.

11 plan groups
City of Oakland 2021-2026 adopted plan; 2026-2031 update remains draft pending adoption verification Oakland Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireDroughtLandslideSea Level RiseSevere WeatherTsunamiDam Failure

Coverage notes

Existing app dataset is derived from Oakland LHMP-style content; source should be expanded with direct page citations before making stronger claims.

StayReady has not completed review of this source or its integration.

Open plan source
City of Berkeley 2024 Local Hazard Mitigation Plan Berkeley Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireLandslideSevere WeatherTsunamiExtreme HeatUtility DisruptionSea Level RiseHigh WindPoor Air QualityDrought

Coverage notes

Official city page states that Council adopted the 2024 LHMP on March 18, 2025. City-specific hazard claims still require named review of the cited plan page.

StayReady has not completed review of this source or its integration.

Open plan source
2024 Tri-City Multi-jurisdictional Local Hazard Mitigation Plan Fremont, Newark, Union City Source review in progress

Hazards in plan scope

EarthquakeFloodLandslideSea Level RiseSevere WeatherTsunamiWildfire

Coverage notes

FEMA-approved Tri-City plan covers Fremont, Newark, Union City, Alameda County Water District, and Union Sanitary District.

Covered by the Tri-City plan; claims should remain plan-level until annex chunks are reviewed.

StayReady has not completed review of this source or its integration.

Open plan source
City of Alameda June 2026 Climate Adaptation and Hazard Mitigation Plan — Final Review Draft Alameda Source review in progress

Hazards in plan scope

FloodSea Level RiseEarthquakeSevere WeatherTsunamiDam FailureExtreme HeatPoor Air QualityDrought

Coverage notes

The city replaced the earlier plan file with a June 2026 Final Review Draft. Its filename says Cal OES approved, but automation does not infer local adoption or FEMA approval. All candidates remain withheld.

StayReady has not completed review of this source or its integration.

Open plan source
Hayward Local Resilience Plan Hayward Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireLandslideSea Level RiseSevere Weather

Coverage notes

Official Hayward LRP page confirmed; source chunks should be expanded from the plan PDF.

StayReady has not completed review of this source or its integration.

Open plan source
Tri-Valley Local Hazard Mitigation Plan Dublin, Livermore, Pleasanton Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireSevere WeatherLandslideDam FailureDrought

Coverage notes

Tri-Valley plan covers Dublin, Livermore, Pleasanton, and Dublin San Ramon Services District.

StayReady has not completed review of this source or its integration.

Open plan source
Albany Hazard Mitigation Albany Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireSevere Weather

Coverage notes

Official Fire Department page confirms Albany's LHMP addresses earthquakes, wildfires, flooding, and other emergencies; detailed plan PDF extraction is still needed.

StayReady has not completed review of this source or its integration.

Open plan source
2025-2030 Local Hazard Mitigation Plan Emeryville Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireSevere Weather

Coverage notes

Official LHMP page confirmed; detailed 91MB plan extraction is still needed before stronger city-specific claims.

StayReady has not completed review of this source or its integration.

Open plan source
2026 Local Hazard Mitigation Plan Piedmont Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireSevere Weather

Coverage notes

Official city news states Council adopted the updated plan on March 2, 2026 after Cal OES/FEMA review. The plan page still links a PDF labeled June/July 2025 public draft, so candidates require a reviewer to confirm adopted-text identity.

StayReady has not completed review of this source or its integration.

Open plan source
City of San Leandro Local Hazard Mitigation Plan — Version 0.8 Public Review Draft San Leandro Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireLandslideSea Level RiseSevere WeatherTsunamiDam FailureCyberattack

Coverage notes

The project-owner supplied 253-page City-branded July 2026 LHMP version 0.8. Its revision table identifies it as the public review draft, and Section 8 adoption documentation is TBD. It is selected as the latest official publication but remains draft-labeled and separate from the adopted 2025 Environmental Hazards Element.

StayReady has not completed review of this source or its integration.

Open plan source
Alameda County 2021 Local Hazard Mitigation Plan Unincorporated Alameda County Source review in progress

Hazards in plan scope

EarthquakeFloodWildfireSevere Weather

Coverage notes

Official GSA page confirms the 2021 plan was adopted March 1, 2022 and FEMA-approved March 10, 2022. Community-specific unincorporated claims still require reviewed citations.

StayReady has not completed review of this source or its integration.

Open plan source