So how do you stay out of deep, well, let's just call it trouble on the ICW? Consider forking over the nominal fee--which in some places is free--to have your holding tank pumped out, because if you're found in violation, you'll be given the maximum civil fine of $250. And don't try any funny business. Florida law requires that overboard discharge valves be closed and secured with something such as a zip-tie so the valve can't be adjusted on the fly. "The valves have to be secured, so someone can't just flip a lever if their boat suddenly gets boarded," says McDonough.