The most important thing is to JUST USE YOUR common sense look for a water spot, if it's in the wall you obviously have to remove the drywall and follow the leak to see were it's coming from.
First check to see that it is not coming from upstairs. (Hint, Hint, Like Maybe from the TOILET, THE WAX RING MIGHT BE WORE OUT, and in need of replacement.)
Plumbing San Diego : Locating a Hidden Leak(s).
THE MOST UNLIKELY PLACE People do not look for a Leak ( IS IN THE TOILET TANK ), Lift up the toilet tank lid and see if water is running? It is always recommended that a PROFESSIONAL repair the toilet or other leak(s). To have it Done the right way the first time (Saving you on an expensive water bill.)
If there is a bathroom directly over the leak there is a good chance that the leak is coming from somewhere in that upstairs bathroom. Sometimes leaks can be even caused when someone takes a shower, and steps out of the shower. (Or Like I already Mentioned from a faulty wax ring.)
Another possibility could be the walls in the shower. Sometimes the Grout begins to disintegrate or deteriorate. Thus allowing water to pass through the TILES. (Best to Just Re grout and Seal the Tiles.)
And Sometimes it's the plumbing itself, which causes a leak. Pipes corrode after awhile. And cause a leak.
And another sneaky leak could be in the Landscaping. Check outside, look for water buildup on grass (from the PVC piping). While Doing Plumbing In San Diego Repair. Has always taught me the obvious, always use Common Sense.
Once you've located the leak than it's just matter of using, Common Sense. (Not to sound to repetitive but it really Does come down to this and Experience.)
And Always USE The appropriate materials for the repair. And obviously you want to use the correct tools. I've seen all kinds of work. (Well that story is for another day.)
I have had to replace work many a time since doing, Plumbing San Diego for 35+ years. So always do the best (that can be done) , even if you have to ask for help, or asking for help at your local Hardware store (if their knowledgeable) is better than just guessing.(for the right tools, and the correct materials.)
Plumbing San Diego, (American Plumbing Co.) Get it done by a professional. The Correct way and it's done.
PLUMBING SAN DIEGO SERVICE, has enjoyed serving San Diego Residences, for over three decades. I have found so many things on Backwards, or that to much material was wasted thus causing other problems. And so was not fixed correctly. And they would end up spending double plus their time. Because it wasn't done right the first time. Basically, I Recommend that a Professional do the work.
Check Out Our Finding a SLAB LEAK Article.