CA AB1122

Requires diesel particulate filters retrofitted onto commercial harbor craft engines to include an override or bypass safety system that maintains safe propulsion levels during emergency situations (such as engine power loss).

Mandates manufacturers design and install the override or bypass safety system with electric monitoring to track usage and provide written materials to vessel owners on proper use and reporting procedures.

Requires vessel owners or operators to report to the filter manufacturer and State Air Resources Board within 30 days of using the override system, including details on the emergency, operational time, and how it mitigated the situation.

Delays compliance with engine retrofit or replacement requirements until the next U.S. Coast Guard inspection or third-party certification, or 30 months from the original compliance date, whichever occurs first.