No. Piranas could survive in that state in the lower portion (past Santa Barbara) during winter months. Also, H.R. Axelrod made some outrageous claims. If you go to my table of contents at OPEFE web site look up Cold Tolerance. Should give you quite a bit of information.Can you do that in Cali now?
The original reason for banning piranas in Oregon circa 1970 was a pacu caught in the Snake river (connecting from the Columbia river). A woman kept the fish after her husband passed away (the fish was his pet) and then elected to release it instead of killing it. She wanted ODFW to take the fish which they refused. The fish was caught later and ODFW identified it as a pirana. It was taken to Oregon State University where the fish was looked at and confirmed to be a pacu. ODFW did not revise their ID and allowed the public to believe a pirana was found in Oregon waters, thereby effectively scaring the public and getting the fish banned until I had the law overturned in 1995.A guy at my work tried to tell me they caught a piranha out of a lake here in Oregon.