New construction · Pasadena
Do I need a soils report for new construction in Pasadena?
A geotechnical (soils) report is effectively required for new construction in Pasadena. City of Pasadena Planning & Community Development — Building & Safety uses it to size the foundation, set drainage, and confirm compliance with California seismic provisions on the parcel.
What changes the answer in Pasadena.
Alluvial fan deposits; expansive clays in some foothill areas. Raymond Fault crosses the city; CGS EQ Zone App lists Alquist-Priolo and liquefaction zones in mapped areas.
- Alluvial fan deposits; expansive clays in some foothill areas.
- Raymond Fault crosses the city; CGS EQ Zone App lists Alquist-Priolo and liquefaction zones in mapped areas.
- Linda Vista, San Rafael, and northern foothills trigger Hillside Development Permit.
- Limited FEMA SFHA; Arroyo Seco corridor has localized flood considerations.
Source-backed note
California Geological Survey publishes seismic-hazard and liquefaction maps; parcels inside designated zones require a site-specific geotechnical investigation under CBC §1803.
Reference: California Geological Survey — Seismic Hazard Zones — California Department of Conservation
Local authority: City of Pasadena Planning & Community Development — Building & Safety
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