This would depend on your individual insurance policy, and the cover that you have been provided. Most home insurance policies should provide cover for water leaks, overflows, or burst pipes, provided that the issue is not something that the property owner knew about and could have prevented. Making sure that your property is well maintained, and checking regularly for leaks, is an important part of ensuring that you are well covered by your insurance company. Suncorp offers a great overview of how they, for example, cover water damage under their insurance.