Next time your premises are not in use, turn off all water fittings, including taps and cisterns. Remember to turn the fittings back on when the test is complete.
Take a reading from your water meter. Note the figure and the date and time. If you have more than one meter, take note of all meter readings.
If possible leave your water fittings turned off for a few hours, e.g. overnight or over a weekend.
After this period take note of the meter reading. There should be no difference in the meter readings at the start and the end of the leak test.
If there is a significant increase between the start and the end of the test, then you may have a leak in your system. You will need to get specialist advice to identify the source of the leak.
You are responsible for maintaining all of the pipes and fittings within the boundary of your premises. It is in your interest to fix any leaks as soon as possible, as you will be billed for the water wasted.