I just installed a sewage sump pumping system in my basement. Do I need to vent the sump through a separate vent or can I tie into a current upstairs vent that vents through the roof? The upstairs plumbing is exposed to the basement but I'm not sure how to tie into an existing vent. Can I vent the sump pump system or the new basement bathroom to the upstairs upstairs bathroom sink drain? Knowing the upstairs sink has a P-trap in the vanity and then drains into the sewage pipe, that runs along the basement joists, I thought that if connecting before the sewage line I would still be venting to the upstairs sink vent. Thanks you.

Scott

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Do I need to vent the sump through a separate vent or can I tie into a current upstairs vent that vents through the roof?

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The pit vent must be a dedicated vent. Since your house vents pull air into the drainage system to relieve the suction caused by draining water the pit vent both pushes air out as the basement discharge enters it and then pulls air back into the pit as the pump discharges back into the system the vent MUST be kept separate.

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Can I vent the sump pump system or the new basement bathroom to the upstairs upstairs bathroom sink drain? Knowing the upstairs sink has a P-trap in the vanity and then drains into the sewage pipe, that runs along the basement joists, I thought that if connecting before the sewage line I would still be venting to the upstairs sink vent.

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You will need two vents. The pit vent must be separate but the fixture vent off the basement lavatory may be revented back into the upstairs lavatory vent at least 6" above the upstairs lavatory flood rim.
Good luck, Tom

I assume that some drywall has to be removed upstairs to correctly connect to and vent a new constructed basement bathroom? Is there a way around having to do that? Is there no way to connect to the exposed upstairs plumbing, draining into the sewage line just below joist level, and get the venting I need? Thanks!

There will be two vents out of your basement. The pit vent MUST be dedicated and not connect to anything else. However you can get around running the fixture vent up to the roof or upstairs bath vent by installing a AAV( Air Admittance Vent) on the basement lavatory. Good luck, Tom