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Question DetailsAsked on 4/24/2015

water is continously flowing into the septic tank through the inlet pipe but no water is running in the house

tank was recently flushed but there was a clog in the inlet pipe. was cleaned out but water still trickles out

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1 Answer


Here is a prior response I gave to that same questions a year or two ago - can't really add much, except to emphasize listening with ear to water pipes in house (with any pumps turned off and hot water heater, furnace/boiler not firing, ventilation fans off) for sounds of leaking.

You may have gas pilots burning, so you have to learn what that sounds like by listening to a pipe near them - do that and then turn a faucet on just a trickle to learn the difference in the sound, easy to distinguish between them once you learn. Listen at both water pipes and drain pipes - drain pipes usually are pretty loud but obvious when you have gotten upstream of where the water is coming into the drain. May need a stethosope or piece of cardboard tubing (like gift wrap core) or pipe to reach to the drain pipe to listen.

Probably most common causes, aside from possibility of groundwater leaking in - toilet running continuously, a trickle feed of water feeding a drain trap to keep it wet - common with upstairs floor drains, sump pump discharging to sewer pipe, air conditioner condensate line run to sewer (very small flow - little more than a drip), dehumidifier draining to floor drain.

Groundwater - could be from short-circuiting of sewage from the leach field back to the incoming sewer pipe or from leaking tank, from a leaking water pipe or sprinkler system, or true groundwater getting into sewer pipe, if actually coming out of the pipe and not around it at the seal between the pipe and the tank.You might be able to hear the inflow point using a metal rod driven into the ground a foot or so (avoid buried cables - get locate if you don't know exactly where telephone, cable TV, electric, gas lines are) then listen, moving along a few feet at a time over the approximate alignment of the sewer pipe. Hollow metal pipe you can just put your ear against, metal rod you probably need a stethoscope against it to hear well. In each case just balance the pipe/rod between fingertips to listen - don't grab onto it or you will dampen out the sound. Should sound like a gurgle, trickle or splash where water is coming into the pipe or if afair flow you might hear it flowing at the inflow point and all points downstream of there, though if just a minor trickle coming in at the bottom of the pipe through a broken pipe or bad joint may not make enough noise to hear - in which case you may need to run a sewer camera through the pipe to locate the source. Typically about $100-250 depending on how accessible pipe is - low end cost only if easy access through a sewer cleanout facing the right way, higher end if have to remove a toilet to get the camera into the pipe.

Answered 5 years ago by LCD

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