The water is fine in AC as long as you get your water from the pipeline. As far as pipeline concerns go, well there were some breaks in the lines due to Keith. The concern is then that there can be sepage into the lines. WASA(who own and operate the distribution system)/Belize Water(produce the RO Water) increased the chlorine level of the water to insure the safety of the water until all breaks have been found and repaired. The water may not taste that great and may smell slightly of chlorine, but it is safe and should, if it hasn't already, return to normal once WASA repairs the pipelines.
As for sewage, WASA operates a waste water treatment plant but I am not sure of the capacity.