How to tell if its my Water Supply Pipe or Drainage Pipe thats Leaking?

AVENUE

I have an older terrace house & i can here water running constantly right at the back wall area of my rear yard. Is there an easy way to tell if this might be my water supply pipe or my drainage pipe? I dont have a water meter & although the water pressure does seem a bit low, it does vary quite a bit. The sound is under the area where the old outside loo would probably have been many years ago. Would both the Water Supply Pipe & Drainage pipe be located in the same areas?

I'm trying to avoid an expensive repair bill so would it be best for me to take out some insurance? I can get Water Supply Pipe cover for £3 a month....but this does not cover Drainage Pipes, i can get Drainage & Plumbing cover for £7 a month....but this doesn't cover the Water Supply Pipe, so would it be best to take out both covers?

I'm with United Utilities who offer a free one off repair to some leaks on water Supply Pipes, but say there are certain conditions and that doesn't cover leaks under buildings or in hard to access places. My leak isnt under a building but might be under my back yard wall, so dont know if this would trigger one of those restrictions? I.m a bit wary calling them out incase i end up having to foot the bill, which is why i'm wondering about the insurance.....any advice would be appreciated.

Best regards - avenue

quotememiserable

Its unlikely to be a supply pipe because they run under pressure and don't make a 'running water' type noise. Its probably a sewer or drainage run. Normally you only hear those is there's a cover for the sound to escape from - can you see any covers around?

keystone

Why two threads?

Cheers