External overflow pipe which is trickling, Help!!

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Andrew Ford

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I have an external overflow pipe which is trickling a steady,slow flow of water onto my driveway. Is this something to do with the toilet? please help!
 

Jimbo

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Hard to imagine anything to do with the toilet could be overflowing in the driveway!

Two things come to mind:

1. Air conditioners have a condensate drain; usually about a ¾" pipe which drips water constantly while running the A/C.


2..The other possible drain: your water heater has a temperture/pressure relief valve, located either on top or on the side. In most newer houses, and old houses if they have been upgraded, a ¾" pipe will run from this relief valve to some drain location, often just draining to an outside location as in you case.

T/P valves can just fail due to old age, or due to some debris in the water lodging in the seat. Also, a frequent cause of T/P dripping can be the pressure regulator valve on your house water supply has failed, causing your house pressure to be too high. This can be checked with a gauge which you can purchase at any harware or plumbing store for under $10.
 

hj

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drain

A general rule, but it is not infallible, is that if the pipe is PVC it is an air conditoner condensate line. If it is copper then it is probably the water heater T&P valve discharge, although it could also be a condensate drain.
 
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