How to Fix Toilet Water Supply Line Under Your House

A toilet in a small room.
What You'll Need
Copper piping
Soldering iron
Plumbers tape

One of the biggest plumbing problems that can happen in your home is that your toilet water supply line can crack or even break. These supply lines have often been under the home since you have been living there, sometimes since the house was built, and they can become worn and old just like any other type of pipeline. If you have this problem, then the best solution is probably to employ a plumber to come and fix it, as it is a nasty job, however, if you are determined to fix it yourself, then you will need a lot of spare time, some basic home improvement tools, and someone to look out for you in case you are injured while trying to fix the toilet water supply line.

Step 1 - Unearth the Water Supply Line

Before you proceed, you will first need to be able to reach under the ground and access your water supply line to your toilet. In most cases, this supply line is buried in the earth, but you may also be able to find it in a crawl space or under the floor in the basement. If the pipe is in the earth, you will need to dig it up properly, but if it is simply laying on the ground in a crawl space, then all you will need to do is get rid of all the spiders and insects that are nesting around it.

Step 2 - Turn off the Water

You should begin by turning off the water supply to your toilet. This will have to be via the main water supply system. You will then need to run out the water from both upstairs and downstairs taps. Run these until there is no more water left in the pipes. You are then ready to proceed.

Step 3 - Examine the Pipe

Start looking at the water supply pipe in greater detail. Look for signs of water pooling around a particular part of the pipe, or damp earth above the pipe if it has been buried. Once you have found the part of the pipe that needs to be fixed, you can remove it using a small wrench or gripping tool. Take off the pipe, and place it to one side.

Step 4 - Add a New Piece

Add a new piece of pipe to your toilet water supply line. The pipe should be the same size as the one you have just removed, and should be cut to a similar length. If you are attaching copper to iron, or your new pipe is a different type of metal, then you will need to add a plastic connector between the two pieces of metal. If not, you can just solder the old and new pipes together. Once this is finished, turn on your water supply, and allow it to run through the supply pipe. Check for signs of leaking, and then use the water as usual.