Thers is a very simple rule here on leaks which is if the leak happens on a pipe that is connected to the meter then it is a community but nore commonly the responsibility of the water supplier
If a break happens in any pipe that are located between the water meter and into the property, regardless where the pipes run, then ay leaks are the responsibility of the home owner to have and to pay for the repairs
It is not normal for water meters to be located long distances from the property, normally they are in community cupboards immediately outside the property or in the entrances to apartments to the pipe runs are easily accessable or very short runs
If you have buildings insurance I would be back to the insurance company as under the regulations this is part of your property infrastructure and should therefore be covered by your buidings insurance
Also how old is the property because ypu may be able to go back to the developed under the 3 year term of claim against the 10 years builders cover
Semijubilada makes a good point that the community should have insurance to cover the infrastructure and the Administrator should be able to give you details of the cover and the company and I would also contract them directly and make a claim