Just come across this information on Cala Santvicenspollensa facebook page notifying property owners that they need to register with EMSER, their new water company:
I was reading about this in the local press recently.
It seems that there were two problems with the previous water supplier to Cala San Vicente. The previous company, which was a private company, had failed to supply water (at some stage in the past year) for a number of days and also, when tested, the chlorine levels in the water were well over the agreed limit.