In the 1980's in Santa Cruz to the north in the vicinity of The Boardwalk, this was a regular occurrence. You would have to check first to see if there was nastiness to decide if you wanted to freeze your bits in ice cold Pacific water. (Cold water: A wetsuit isn't all that much help. I recommend a dry suit year round if you surf the Pacific in N. America.)

I guess those times are gone because there's monitoring and better waste management now, except just after major storms when there's always a risk of discharge.