CA SB1090

Requires the California Coastal Commission or local governments with approved coastal programs to approve repair, maintenance, or construction of seawalls, revetments, and similar shoreline protective devices in Orange and San Diego counties' coastal hazard mitigation zones if designed to protect against coastal erosion.

Limits private property owners' sand mitigation offset obligations to the lesser of $25,000 or 1 percent of assessed property value, with offsets to be added before construction begins at the applicant's expense.

Allows denials only if the shoreline protective device would constitute a substantial threat to public health or safety; requires denying local governments to notify the Coastal Commission within 30 days with supporting evidence, and requires the Commission to report denials to the Legislature within 30 days.

Requires the Coastal Commission and local governments to make approval or denial decisions within 30 calendar days of application submission and permits them to charge fees equivalent to emergency permit processing fees.

Exempts actions taken under this section from California Environmental Quality Act (CEQA) requirements and specifies that decisions denying applications are subject to de novo judicial review under Code of Civil Procedure Section 1094.5.