Sewage smell in closet

[Dave Mazone]

Does anyone know why the closet smells of sewage when the black tank approaches 50%, and what remedies might be available?

PS: happens when not traveling, too.

[Steph and Dud B]

The tank vent pipe runs through the closet. It may be damaged/leaking fumes and/or not connected through the roof properly. There should be no odor.

[Galway Girl]

Ours sometimes smells as well.  We've not seen any leaks in the system so I'll be following to see if you learn something new.
CS

[Frank C]

There normally shouldn’t be any odor.  As suggested, check all the vent pipe connections, and you may also want to pull up the toilet and see if the mounting flange is broken.  We had an odor issue and traced it to a broken toilet mounting flange that was creating a small leak into the hull area under the bathroom floor and onto the top of the black tank.  Oliver uses an all plastic toilet mounting flange that seems prone to breakage.  I replaced it with a metal ring toilet flange.   Problem solved, no more odor.  Fortunately we only use the camper toilet for #1.  #2 is done at campground facilities or roadside rest stops, so the clean up and repair wasn’t too disgusting.  

[Dave Mazone]

On 4/22/2023 at 7:59 AM, Steph and Dud B said:

The tank vent pipe runs through the closet. It may be damaged/leaking fumes and/or not connected through the roof properly. There should be no odor.

Thanks, I'll check it out.