The National Water Commission produces more than 90 % of Jamaica's total potable water supply from a network of more than 160 underground wells, over 116 river sources (via water treatment plants) and 147 springs. The various Parish Councils and a small number of private water companies supply the rest of the potable water, while The National Irrigation Commission provides irrigation services. Approximately 30% of the water abstracted in Jamaica is used to meet the demand for potable water and the remaining 70% of abstracted water is used for irrigation.

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.

More than 70% of Jamaican households are supplied via house connections and the remaining 30% obtains water from standpipes, water trucks, wayside tanks, community catchment tanks and direct access to rivers and streams.

Similarly, approximately 30% of Jamaica's population is served by sewerage facilities operated by the NWC in major towns and associated with several housing developments in various locations throughout the country. The disposal of the sewage generated in the remainder of the population is done through various types of on-site systems such as septic tanks, soak-away pits, and pit latrines.

The NWC facilities also include over 4,000 kilometres of pipelines and more than 500 kilometres of sewer mains across the island. From rivers, springs and wells, the NWC supplies some 190 million gallons of potable water each day to valued customers across Jamaica.