Use home sewer cleanout as dump station?
I have found references to dumping RV tanks into home sewer cleanouts on other forums, but nothing definitive. In colder climates, it's not allowed for fear that the hose will stay connected for more...
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Where do you think the dump station at the RV park goes? I'll give you a hint, same place your cleanout goes. The only issue you could run into is if you aren't careful and dump some on the ground. Then you could run into environmental issues.
