Odinson,
Water wars coming soon is no joke!!! It is common knowledge in the US that large tracts of land with known aquifers beneath are being bought up as we speak. Those who own the water will control the world!! Think of the amount of money being made selling a plastic bottle of water for a couple of bucks.
As far as Jamaica goes and especially Negril the problem is two fold as Cap points out, the supply and the disposal. I am far from being a water engineer but obviously with all the development that has occurred in Negril the need for water and where and how to treat it has become a huge problem. Conservation comes to mind. Using as little water as possible while on vacation in Negril is a starting place. Sure you are on vacation spending big $$$ for accommodations some people feel entitled to using as much water as they want. I assume / hope that hotels encourage their guests to be frugal with their water usage as far as bathroom usage goes. The more you use the more to treat. But the bigger problem is the water supply. Hopefully Jamaica and all its Parishes have workable game plans in place.
Back in the 70's before the building boom were there even any water treatment facilities in Negril. As I recall there were few flush toilets and mostly outdoor cold water showers which leads me to believe there was mostly septic tanks and perhaps some direct discharge into the river or sea?? When were the treatment facilities built??