No surprise there. After all this IS Jamaica where a deep distrust of the government is common and judging from where the government has been in the past, probably has some merit but......
The water system inherited from the Colonial Government was very good and remains so (for the most part) to this day especially in touristy areas.
I live in an area with no pipe water and drink captured rain water without treatment and (to date) with no consequences though I am changing that this year is a filtration system.
The water in Negril is (I believe) very safe to drink.
Peace and Guidance