You can detect potential leakages by locating your water meter at the front of your house at a time in the day before you leave home for work, or similar when no one will be using the water for a long period of time. Write down the meter reading. When you return home check the meter and if the number has increased, even slightly, you may have sprung a leak!
Call Liquid Allsorts on 9291 4998 and they will sort it out before it turns into a puddle big enough to fill the neighbours pool.