Checking for a leak at your home is easy.  First make sure that everything in your home that uses water is turned off.  Then locate your meter, and open the lid, be careful not to damage the electronic device and wire that is attached.  Next check the face of the meter to see if the leak indicator is turning.  For a detailed picture and further instructions on checking for a leak open the PDF link below.  If you suspect that your toilet is leaking you can also click on the leaking toilet PDF link for some ways to check.