Where does the water come from? Water keeps running in laundry room. Pls help!

Hi all,

In my laundry room I have a pipe that runs from time to time. (see pic, pipe is on the right, just above drain of washer)
I left the house for 3 days and turned the water to the house off. When I came back, I obv turned it back on and since then the water has been running constantly out of that pipe.
If I turn the main valve of the house off, the water stops running.

I am totally confused. I do not know why the water is constantly running since I returned. (2 days now)
I have no idea what the pipe is for or what it drains?
Please help if you can because I am totally lost on this matter.
Thank you in advance.

No idea what it is!

Do you have a filtration system (maybe a RO filter)? It could be a drain from it. What about a condensing WH or boiler?

Could that be the overflow from your swamp cooler on the roof of your single-story house?

We do have a water softener and a water heater.
See pic below. I think it has to do with one of those, but I did not turn any valves on or off on those units, so I am confused on WHY the water keeps running AFTER I returned from my trip.
The water to our house comes from a personal well but I do not think it has anything to do with that.


Thank you.

I live in Az and we have a 2 story house with regular dual function AC unit + heat pump.
Thank you.

Reach4 said:

Could that be the overflow from your swamp cooler on the roof of your single-story house?

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flapus007 said:

We do have a water softener and a water heater.
See pic below. I think it has to do with one of those, but I did not turn any valves on or off on those units, so I am confused on WHY the water keeps running AFTER I returned from my trip.

Click to expand...

Why do you think it is one of those. Sounds? Where is that water softener and heater area with respect to the washing machine area.

The softener could have started a regeneration cycle that is powered by water flow. Where does that black tubing from your water softener go? That would be the discharge from the water softener rinse and backwash cycles, but I don't know how that black tubing gets to that pipe where you said the water was discharging from.

In your first picture, I think you are describing water coming from the open end of the painted vertical pipe in the washing maching box. Is the water dripping out, or flowing out?

That looks like a conventional WH, so unless they used PVC for the outlet of the T&P safety valve (they shouldn't do that, it is not rated for that purpose), it isn't the WH. Near any of those appliances, do you see a pvc pipe going into the wall, or do you have a filter somewhere (RO filters dump a moderate amount of water when processing)...you'll have to be more of a detective and drop some more clues. We can't see your house, or know your situation. The common things that often end up going down the WM drain are condensate from condensing burners, overflow from a humidifier, maybe the outlet of a humidifier, or the outlet from say the drain pan of an a/c unit. Nothing else that comes to mind requires an indirect connection like you have there.

My guess is that the mystery pipe is possibly the overflow from the heat/AC coil. Where is the indoor part of your heat pump? Is it above the washier or in the attic and do you have a central humidifier?

Edit: oops, I just read the last post again. Sorry for being redundant.

flapus007 said:

Hi all,

In my laundry room I have a pipe that runs from time to time. (see pic, pipe is on the right, just above drain of washer)
I left the house for 3 days and turned the water to the house off. When I came back, I obv turned it back on and since then the water has been running constantly out of that pipe.
If I turn the main valve of the house off, the water stops running.

I am totally confused. I do not know why the water is constantly running since I returned. (2 days now)
I have no idea what the pipe is for or what it drains?
Please help if you can because I am totally lost on this matter.
Thank you in advance.

View attachment 22799

Click to expand...

Same problem ..it's this pipe on the left that keeps running. All day, everyday..HELLPPPPP

Condensate for A/C or something is what springs to mind but without looking I couldn’t tell you.

flapus007 said:

Hi all,

In my laundry room I have a pipe that runs from time to time. (see pic, pipe is on the right, just above drain of washer)
I left the house for 3 days and turned the water to the house off. When I came back, I obv turned it back on and since then the water has been running constantly out of that pipe.
If I turn the main valve of the house off, the water stops running.

I am totally confused. I do not know why the water is constantly running since I returned. (2 days now)
I have no idea what the pipe is for or what it drains?
Please help if you can because I am totally lost on this matter.
Thank you in advance.

View attachment 22799

Click to expand...

I have the same problem, did you resolve this!?