Last summer we took our last boat to Avalon
and stayed a few days. The harbor patrol asked if we had a porta-potty (it was a smaller boat, Coronado 25). When I said yeah, they didn't even bother to check.
I emptied it twice (very small tank) in the public restroom by the dinghy
landing. I didn't even put it in a bag to hide it. No one hassled me. I generally dumped the tank in the public restrooms in Mission Bay when we were on a ball.
My 'cruising' experience is pretty limited though, so I imagine if I'd done it for a few months, I might have gotten hassled.
I'm even considering a porta-john for our current
boat, which is a liveaboard
. It's current
system is the old illegal variety. I don't mind spending the money
and time to plumb the whole thing, but it seems simpler without, two less thru-holes and one less deck