Can I Dump Through Sewer Vent?

Sewer or septic tanks? I assume you are certain this goes to one or the other. If so, then yes, just be careful you don't over load a septic system if your RV holding tanks are large. You can run some water down the vent with a fresh water hose to confirm their is no blockage that would cause a back up. You really don't want that!

We have sewers.

it may not be a "sewer vent" but the sewer clean out access point. Most houses with access to sewer lines have a clean out port outside the house. If that is what it is, yes it can be used as a dump. That's exactly what we do.

Might not make the city sewer administrators to happy. But--when we built our new house we had the plumbing fixed so I have a dump port that goes into the city sewer. They approved the plumbing so I guess in our case it was ok.

sure, that's not an oil tank fill?

winnietrey wrote:
sure, that's not an oil tank fill?

that was my guess. doesn't looks like any sewer clean-out access port that I've ever seen.

100% for the sewer. We have gas and and houses that have oil tanks are in the backyard. You can even hear water gurgling as it flows out.

Trust me, I’ve lived in the area for over 40 years. Lol

If you are sure, it is sewer, yes, you can dump into it.
Older locations have/dad cast iron pipe for sewer. They didn't always use a standard cap on that type of pipe.
Location to me sounds like sewer clean out.

Suggestion:
Run a garden hose at full blast for 5-10 minutes into that pipe and see if anything "unexpected" happens.

Then, dump your waste tank at your regular dumping facility. Then use your black tank flush several times and really clean the black waste tank as good as you can. Then, fill up your black waste tank with fresh water until it is 100% full. Then, do a test dump at your home with all that "mostly clean" water and see what happens. In the event things don't work out quite how you thought, or things back up because it flows too fast into it, or if it backs up or flows out somewhere else, at least it will be with "mostly clean" water coming during this test dump.

That's what I would do.

We have a waste line clean-out access point in our front yard. I have wanted to try it out. But my wife doesn't want me to so I don't. Is anyone else picturing Cousin Eddie in a bathrobe and smoking a cigar right now???

Good luck!
Chris

Another thought would be to look at neighbors to see if they have same type of "vent".