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Old 02-23-2010, 06:49 PM   #1
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some engineering help with new bathroom drainage


hi there. i'm building a bathroom in my barn studio which i built a few years.

the barn is across the driveway from the house, and about 100' feet away from the existing septic tank.

what i'd really like to do is drain the new bathroom into the existing septic tank. it will be a super low usage bathroom. i'm obviously doing all this without a permit, to my own house, trying to do it as cheaply as possible, but still do the plumbing correctly.

i believe the run from the new bath to septic tank will be slightly uphill.

the questions:

1) what kind of pump do i need, assuming an uphill rise?
2) it's my understanding that a regular 4" drain would feed the pump, and then a 2" pressure line from the pump to septic tank; does this 2" line need to be below grade?
3) what is the best way of connecting the pipe into the old septic tank? should i try to Y into the 4" line from the house, or should i simply 'knock a hole' in the tank and adapt into it somehow?


when i excavated a trench to bring a water line from the house, i nearly dozed right through the house drain line. it looked like ceramic, or maybe cast iron covered in concrete (?), but the sucker was barely a foot below grade, i would say, and i was almost right next to the tank.

i would appreciate any advice on how to proceed with this.

thank you.
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Old 02-23-2010, 09:51 PM   #2
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some engineering help with new bathroom drainage


Around here, the sanitarian does not allow sewage to be pumped into a septic tank. Supposedly this will cause the tank to fail.

That being said, my PERSONAL theory, (mind you i'm no expert on septic tanks) is that if you were to pump it into the upper end of your drainage system, it would be no different than flushing a toilet by the time it hit the septic tank. I'm not saying you SHOULD do this, nor am I saying it would work.
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Old 02-23-2010, 10:01 PM   #3
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some engineering help with new bathroom drainage


It's also illegal to do your own plumbing in MA
Of course if you are out in the boonies....
Thye do have macerating toilets that will "pump" a good distance
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