The management of Jamaica's freshwater resources is primarily the domain and responsibility of the National Water Commission (NWC). The duties of providing service and water infrastructure maintenance for rural communities across Jamaica are shared with the Parish Councils. Where possible efficiencies have been identified, the NWC has outsourced various operations to the private sector.

Water supplies are adequate to meet the demands of all sectors; however, the supplies are not located close to where most of the population lives. This has created inconsistent delivery of water to the citizens and has fostered new efforts at improving the water delivery systems of Jamaica. Other challenges include the lack of clear communication and effective coordination between the relevant water management institutions, however efforts are being made here as well to correct this deficiency.

Physical water resources in Jamaica consist of ample groundwater captured in both limestone and alluvial aquifers and many important rivers that provide a good source of water for the agriculture communities of the rural highlands and coastal lowlands. Groundwater provides about 85% of the country's water needs. The NWC satisfies about 78% of the total demand for water, whereby approximately 95% of the urban population has access to water while only about 75% of the rural populations have obtained access.

Important to the recent history of Jamaica freshwater water legislation is the Water Resources Act of 1995 that created a National Water Plan. This water plan set out to develop, protect, and better manage the water resources of Jamaica so that a growing unmet demand for water could be addressed and successfully resolved.

Water management challenges There is concern that over-exploitation, industrial effluents and sewage wastes are affecting aquifers and surface waters at an alarming rate. As much as 10% of the groundwater resource has been either abandoned or use is restricted due to saline intrusion or pollution. Fifty percent of the unused water resources in the Liguanea Basin serving the Kingston and St. Andrew area are contaminated with nitrates.

While water coverage is good at around 95%, reliability of supply to urban households and industrial users is often erratic. Sufficient water exists in the island to meet all water demands, but the water resources are not necessarily located close to the major centers of water use. The infrastructure to move water to the areas where it is needed is inadequate in some parts of the country. The root of Jamaica's problems in the urban water sector are complex. Difficulty in securing the proper financial resources is problematic as the National Water Commission (NWC) has incurred losses. The NWC comes close to covering its operating costs, but does not generate any surplus, therefore finances for investment are not available.

To help deal with the cash shortfalls, the NWC relies on the Government to finance new infrastructure. Competing demands on the Government's budget mean that this source has not been adequate to provide for the water infrastructure needs of the country. In spite of numerous interventions by the Government to make the NWC more commercially focused, the desired results have not been achieved for a number of reasons, including: i) the absence of timely and adequate tariff adjustments; ii) an increase in the area served by the NWC; iii) and insufficient capital to upgrade the water facilities and infrastructures.

Providing water to rural residents is a considerable challenge as well. Lower population densities mean that the cost of water provision in rural areas is often higher than in urban areas, while lower incomes in many rural areas make it difficult for some customers to meet the full cost of high quality services. This decreases the likelihood that the private sector will be willing to engage into the rural water sector.

Water resource base Mean annual rainfall in Jamaica is not even across the island. Much of the rainfall results from northeasterly trade winds which release most of their moisture on the northern slopes of the Blue mountain range. Annual rainfall in the northeastern mountain slopes is normally between 3,000 and 5,000 mm (118 to 196 inches) whereas rainfall averages in the south coastal plains is much less at around 1,500 mm (60 inches).

The most significant rains fall in October and May while the dry season lasts from December to April. Fifty-six percent of the average annual rainfall are lost to evapotranspiration. Due to its geographic location, Jamaica is regularly in the path of tropical storms and hurricanes during the period of July to November. These storms are of high intensity and great magnitudes characterized by flood-producing rainfall amounts.

Groundwater and Surface water resources The internal renewable water resources (IRWR) are 9.4 km3/year, with 5.5 and 3.9 km3/year for surface and groundwater respectively. Approximately 44% of these IRWR are considered exploitable or reliable. Of the total reliable yield of 4.09 km3/year, 80% is contributed from the limestone aquifer, 4% from the alluvial aquifer which is made up of sediments (sand, silt, clay, gravel) and 16% from surface water runoff. About 20% of the limestone aquifer is developed with wells, mainly in the Río Cobre and Rio Minho regions. In most other basins, the base flow is adequate to supply water and can be exploited through developments on the rivers.

Major rivers, lakes & reservoirs

There are two major raw water storage facilities, both located in St. Andrew. The Mona Reservoir, with intakes at the Hope and Yallahs Rivers, has a storage capacity of 3.67 million m3. Hermitage Reservoir with intakes at Ginger River and Wag/Morsham River, has a storage capacity 1.78 million m3.

Jamaica counts over one hundred rivers and many are still unexplored due to their significant fall from the mountainous regions. For the most part, the rivers are used for irrigation and as a resource for domestic uses. Two important rivers in Jamaica include the Black River and the Rio Minho. The Black river is 53.4 km long and is used for tourism, irrigation, and The Rio Minho is the longest river in Jamaica at nearly 93 km with headwaters originating in the geographic center of the country.

Water quality Managing Director of the Water Resources Authority (WRA), Basil Fernandez, has expressed his view that Jamaica's water quality is among the best in the world. He stated in 2008 on the Jamaica Information Service that, "you have to remember that our water is not tainted by pharmaceuticals and chemicals found in water from other countries,". Mr. Fernandez added that, "the high quality of water is also a result of the rigorous process of water treatment that we have. In fact, people in many other countries do not drink the water that is provided from their municipal service. In Jamaica, we have stringently sought to achieve the World Health Organization (WHO) and the Ministry of Health's water quality standards".

However, a study published in 2010 by a researcher at Missouri State University raises some concern about the quality of Jamaica's water in an important region of Jamaica, the Bluefields Bay watershed. The research indicates that water supplies for drinking water and ecological support in Jamaica are threatened due to poverty and poor infrastructure. Domestic and commercial activities pollute rivers and coastal waters as well. The report goes on to say that the best water quality is found at sites where stream systems filter water through healthy wetland environments, and at sites further away from settled areas and lined with larger riparian corridors. The worst water quality is normally located in streams that have little or no riparian zones and are heavily used for washing clothes.

+ Major water basins of JamaicaFAO 2000 Hydrographic Basin Surface Area (km2) Rainfall totals (million m3) Evapotranspiration (million m3) Surface water runoff (million m3) Groundwater discharge (million m3) Blue Mountains, South 678 1,694 912 662 147 Kingston 202 312 208 81 50 Río Cobre 1,283 2,009 1,450 177 472 Río Minho 1,700 2,420 1,641 225 593 Black River 1,460 2,530 1,530 346 654 Cabarita River 924 1,890 1,019 366 451 Great River 791 1,685 863 467 355 Martha Brae, River 756 1,154 673 279 201 Dry Harbour Mountains 1,362 2,450 1,302 457 691 Blue Mountains, North 1,597 5,068 2,346 2,452 278 Total 10,753 11,906 5,512 3,892

Water resources management by sector

Water coverage and usage Only 11% of the surface water and 25% of groundwater of the exploitable water resources were utilized as of 1998. The National Water Commission (NWC) provides water to various supply systems from wells, rivers and springs. A total of 500 water-supply facilities are operated by the NWC and supply 78% of total demand. Access to water supply in 1998 was available to 75% of the rural population and to 95% of those residing in urban areas. Access to water supply via house connections was available to approximately 65% of the population.

The remaining 35% of the population were supplied through a variety of standpipes, rainwater collection systems, water trucks, wayside tanks, and community catchment tanks. Annual water withdrawal in 2002 was estimated in 0.41 billion m3 and the agricultural sector was the major user of water (48%). The other major water users were domestic water supply 34%, industry 17% and tourism 1%. About 92% of the water was withdrawn from groundwater sources and the remainder from surface water.

Irrigation

According to the National Irrigation Development Plan (NIDP) suitable areas for irrigation are classified into three land categories: i) lands which may be irrigated with all common techniques of irrigation; ii) lands suited only to sprinkler and micro-irrigation techniques; and iii), lands with generally steep slopes (>10%), shallow top soils which are productive with careful management and manual irrigation. This third category applies mainly to small hillside farmers. By these categories, 90,811 ha were classified as either category i or ii, while 97,095 ha or 9% of the island were classified as Category iii.

Irrigation has always played a significant role in the island's agriculture, and the need to continuously improve irrigation practices has long been recognized. Over the years some of the improvements which have been made included channel lining and utilization of closed pipes in order to improve efficiency in conveyance infrastructure, the use of water measuring techniques to encourage improved management, and the use of overnight storage facilities. Approximately 9% (about 25,000 ha) of the area under cultivation are irrigated, and about 9,000 ha require rehabilitation.

Half of the total irrigated area comprises public schemes which are managed by the National Irrigation Commission (NIC), while the other half is on individual private systems and on commercial estates, where banana, papaya and sugar cane are the major crops grown. Three-quarters of the area are under surface irrigation, 17% are equipped with sprinklers and 7% with micro-irrigation or localized systems. Groundwater is being threatened by saline intrusion and contamination from industrial effluents and untreated municipal discharges. For these reasons wastewater reuse is included in the National Irrigation Development Plan (NIDP).

Stormwater