 The various Parish Councils and a small number of private water companies supply the rest of the potable water.The NWC operates more than 1,000 water supply and over 100 sewerage facilities islandwide.These vary from large raw water storage reservoirs at Hermitage and Mona in St. Andrew and the Great River treatment plant in St. James, to medium-sized and small diesel-driven pumping installations serving rural towns and villages across Jamaica.