There are other skills plumbers need aside from being able to work with water. One of the most common things that a new toilet on is fixing water lines.
Examine the washer and replace it with a new one. Also replace screws in water line repair case they are old and damaged too. The new ones you buy should be durable and of good quality.

In general, plumbers out there can be subdivided into two: one who can do the basic maintenance plumbing duties and the other one who is capable of handling more complicated and general works. Let's discuss these two types.
The location of a plumbing contractor is a key factor. This is because he or she will not only charge you an hourly rate, but travel costs will also be charged. This can add a significant amount to the final bill if the contractor has to travel from the other side of town.
The first step in the replacement project is to turn off the water line repair to the toilet and flush any water that may be in the tank. If you forget this step, you will have a giant mess to clean up! You should now disconnect that water line.
When doing the install on a water heater, keep an eye out for unconnected pipes. A commonly missed pipe is the one that leads out from the area for drainage. It is probably a recirculation pipe; that helps your water remain heated without wasting too much water.
Is your garbage disposal clogged, but it is turning ok? This may be due to a blockage in the pipe. If you look at the pipe work under your sink you will see that the disposal is connected to a pipe that should join to a U bend and providing it was installed correctly it should have a connector that can be undone. If you undo this connector the pipe will pull away and generally this is where most blockages occur. Remove the blockage and reconnect the pipe.