CA SB935

Replaces "hull fouling" with "biofouling" and expands the definition to include attachment of marine organisms to the "wetted portion" of a vessel, including sea chests, propellers, anchors, and associated chains.

Requires masters, owners, operators, or persons in charge of vessels arriving at California ports to remove biofouling organisms on a regular basis, with compliance timelines based on vessel Safety Construction Certificates, Coast Guard Certificates of Inspection, or 60-month drydocking intervals.

Extends the deadline for State Lands Commission approval of experimental ballast water treatment systems from January 1, 2008, to January 1, 2016, allowing approved systems to be deemed compliant with future treatment standards for up to five years.

Requires biofouling management regulations to be developed and adopted by January 1, 2012, based on best available technology and considering vessel design and voyage duration.

Takes effect immediately as an urgency statute to protect California's environment and waters from nonindigenous species introduction through vessel vectors.