How long can you use your black tank without needing to dump it? It’s a common question for RV families embarking on their first dry camping trip. Nobody wants the surprise of the dreaded poop pyramid. 

By the end of this article, you will know exactly how many days you can go without dumping your black tank based on A) the size of your family, B) the size of your black tank, and C) how often you eat at Taco Bell. 

TL;DR: For most average-sized RVs with 2-3 occupants, you can go about a week before dumping your black tank.