On my way to Catalina, I happen to notice as I passed by one of the pump out piers that I have never seen a commercial boat use one. Specifically, crew boats, service boats, fish boats, tour boats, etc. They are not too big to use the pier, running 35-80 feet. I assume ferries pump out over three miles as do the fish boats. Some of the larger dinner boats probably go out to dump, although I have never seen them. The crew boats and service boats are in the harbor or anchorages 99% of the time, but I have never seen them there. Maybe there is an exemption or a treatment allowed (although no-discharge for pleasure boats)? Just musing.