I stopped in to dump my porta potti. He said, $25. I told him my Porta potty was only 4 gallons, and he said it doesn’t matter. I usually don’t have to dump I can do it at home but I got caught away from home for an extended period. The research that I have done and said that most RV dump charge $10 for dumping. What they were charging at $25 was over the price of gasoline. In fact, it was almost double! Lol