Lake Berryessa remains free of invasive freshwater mussels — for now. But the recent arrival of golden mussels in the Sacramento-San Joaquin Delta has prompted Napa County to bolster its efforts to keep the pests out. On Tuesday, the Napa County Board of Supervisors signaled support for a new ordinance that would give county inspectors and sheriff’s deputies the authority to stop and inspect any vehicles, trailers, boats or other watercraft that could be carrying mussels — either adult or larval — at any of the lake’s resort areas. The ordinance would also allow them to issue citations, including fines and misdemeanor charges, to violators. The inspection program itself isn’t new, said Thomas Zeleny, chief deputy county counsel. The ordinance essentially codifies what the county is already doing. … Sheriff Oscar Ortiz added that existing rules lack enforcement power. Right now, there’s “no teeth” — nothing inspectors can actually write a citation for, he said.

Other golden mussels news:

• U.S. Forest Service: News release: Help halt golden mussel invasion in waterways