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bergerdude 11-29-2011 06:36 PM

Sump to sewer, sewer gases
I have a home with a backup sump that goes into the city sewer,( apparently the city is fine with it.)

There is a check valve as any sump would have, however I wonder about sewer gases finding their way back thru into the home either thru the pump or the 1/4 hole in the pipe by the pump (for air lock?). Im not sure what the previous owners plan exactly was.

Anyway, is it virtually impossible for bugs, sewer gases, etc. To come back thru the pipe, OR should I retrofit,insert a trap like you would see under a sink to prevent this?


Bud Cline 11-29-2011 06:38 PM

Water bugs, frogs, lizards, snakes, mice, all come to mind.:)

bergerdude 11-29-2011 10:03 PM

so I doubt frogs or lizards, but possibly mites or sewer gas.
So what's the waynto handle this?


Alan 11-30-2011 08:54 AM

If you have a check valve, then the discharge line is always full of water, right? :huh::eek:

maxim1 12-01-2011 06:11 PM

My main sump has a check valve in the line about a foot from the top cover of the sump pit. I guess that pipe has water sitting on top of the check valve....?? hmmm

Is that true ? :eek:

That would simply things ALOT, is that what you are trying to get me to understand?:wink:

joecaption 12-01-2011 06:14 PM

The check valve will stop any gas or insects.
Never head of a public sewer system allowing sump pump to drain into there systems. Most would have a fine if you did so.

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