Water and Sanitation in Bhutan

Access to clean drinking water and adequate sanitation are foundational pillars of Bhutan's development strategy, enshrined in the country's constitution and integrated into every Five-Year Plan since the 1960s. Bhutan's rugged Himalayan terrain — with settlements scattered across steep valleys and high-altitude plateaus connected by limited road networks — poses unique challenges for water and sanitation infrastructure that few other countries face at comparable scale. Despite these geographic obstacles, the Royal Government of Bhutan has achieved notable gains: by 2022, approximately 98 percent of the population had access to an improved water source, and around 97 percent had access to basic sanitation facilities, according to the WHO/UNICEF Joint Monitoring Programme.^[1]

These headline figures, however, mask significant disparities. Urban centres such as Thimphu, Phuentsholing, and Gelephu enjoy relatively reliable piped water networks and sewerage systems, while many rural communities — particularly in eastern dzongkhags like Lhuentse, Trashigang, and Mongar — depend on gravity-fed spring water systems that are vulnerable to seasonal variation, climate change, and infrastructure deterioration. Understanding Bhutan's water and sanitation landscape requires examining both the achievements and the persistent gaps that the government and its international partners continue to address.^[2]

Historical Development

Prior to the modernisation era launched by the Third King, Jigme Dorji Wangchuck, in the 1960s, Bhutan had virtually no modern water supply infrastructure. Communities relied on natural springs, streams, and rivers, often carrying water over considerable distances. The introduction of Five-Year Plans beginning in 1961 brought the first systematic efforts to develop rural water supply, initially focused on the most accessible communities and gradually extending to more remote areas. By the Fourth Five-Year Plan (1976-1981), rural water supply had become a priority sector, with the government establishing a dedicated Rural Water Supply Section within the Department of Public Health Engineering.^[3]

The pace of development accelerated significantly from the 1990s onward, driven by a combination of increased government revenue (particularly from hydropower exports to India), growing international aid, and the government's commitment to the Millennium Development Goals and subsequently the Sustainable Development Goals. Denmark's DANIDA was among the earliest bilateral donors to support Bhutan's water sector, funding rural water supply schemes across several dzongkhags beginning in the 1980s. The Asian Development Bank (ADB) has been a major partner since the 1990s, financing urban water supply improvements in Thimphu and other towns, while UNICEF has focused on community-level water supply, sanitation, and hygiene (WASH) programmes, particularly in schools and health centres.^[4]

Rural Water Supply Systems

The backbone of Bhutan's rural water supply is the gravity-fed spring water system, a technology well-suited to the country's mountainous topography. These systems capture water from natural springs at higher elevations and deliver it through pipes to distribution points — typically community standpipes or, increasingly, individual household connections — at lower elevations, using gravity alone without the need for pumping or electricity. By 2020, the government had constructed over 3,700 rural water supply schemes serving approximately 85 percent of the rural population, according to the Department of Engineering Services within the Ministry of Works and Human Settlement.^[5]

However, the sustainability of these systems is a persistent concern. Many were built with external funding and technical assistance during the 1990s and 2000s, and their pipes, intake structures, and storage tanks are now aging. Maintenance depends on community-level management through Water User Associations (WUAs) — village committees responsible for routine upkeep, fee collection, and minor repairs. While the WUA model works well in some communities, it struggles in others where population is small, technical knowledge limited, or community cohesion weak. A 2019 assessment by the Royal Government found that roughly 30 percent of rural water supply schemes were in need of significant rehabilitation or replacement, with eastern dzongkhags disproportionately affected.^[6]

Climate change poses an additional threat to spring-fed systems. Bhutan's springs are recharged by rainfall and snowmelt, and changing precipitation patterns — including more intense but less frequent rainfall events and earlier snowmelt — have caused some springs to diminish or dry up entirely. Communities in Bumthang, Lhuentse, and other central and eastern districts have reported declining spring yields, forcing some to seek alternative water sources at greater distances or lower elevations. The National Environment Commission and the Department of Engineering Services have begun incorporating climate resilience into water supply planning, including spring-source protection measures, rainwater harvesting, and groundwater exploration as supplementary sources.^[7]

Urban Water Supply and Sanitation

Bhutan's urban areas, home to approximately 40 percent of the population as of 2023, generally have better water and sanitation infrastructure than rural communities, though rapid urbanisation has strained existing systems. Thimphu's water supply is managed by the Thimphu Thromde (municipal corporation) and draws from multiple sources including the Dodena and Jungshina streams, supplemented by groundwater wells. Demand has grown rapidly alongside the capital's population expansion — Thimphu's population roughly doubled between 2005 and 2020 — and water rationing during dry winter months has become common. The ADB-funded Thimphu Urban Water Supply Project, completed in phases between 2010 and 2020, expanded treatment capacity and distribution networks, but continued population growth has kept supply under pressure.^[3]

Sanitation in urban areas relies primarily on septic tank systems, with limited sewerage networks. Thimphu and Phuentsholing have partial sewer systems, but the majority of urban households use septic tanks with periodic desludging. The management of faecal sludge — collection, transport, treatment, and disposal — has emerged as a growing concern as urban populations expand. Open defecation has been virtually eliminated in urban Bhutan, but the quality and maintenance of sanitation facilities varies considerably. The government's 12th Five-Year Plan (2018-2023) allocated significant resources to improving urban sanitation, including the construction of faecal sludge treatment plants and the expansion of sewer networks in Thimphu and secondary towns.^[8]

International Partnerships

Bhutan's water and sanitation sector has benefited from sustained international support. UNICEF has been the most prominent partner in rural WASH, working with the Ministry of Health and the Ministry of Education to improve water and sanitation in schools and health centres, promote hygiene behaviour change (particularly handwashing), and strengthen community-level water management. UNICEF's Community-Led Total Sanitation (CLTS) programme, introduced in Bhutan in the late 2000s, helped accelerate the elimination of open defecation in rural areas by mobilising communities to build and use latrines without external subsidies for individual household facilities.^[2]

The Asian Development Bank has focused primarily on urban water supply, financing major infrastructure projects in Thimphu, Phuentsholing, and several secondary towns. ADB projects have also supported institutional strengthening, including the development of water tariff policies, utility management training, and non-revenue water reduction programmes. Japan International Cooperation Agency (JICA) has contributed technical assistance and infrastructure funding, particularly for water treatment technology. The World Bank, while less active in Bhutan's water sector than in some neighbouring countries, has provided analytical support and policy advice through its involvement in broader development programmes.^[4]

Groundwater and Alternative Sources

Groundwater has historically played a minor role in Bhutan's water supply, as the abundance of surface springs and streams made it unnecessary for most communities. However, growing awareness of climate-related risks to spring-fed systems has prompted increased interest in groundwater as a supplementary or alternative source. The Department of Geology and Mines, in collaboration with international partners, has conducted hydrogeological surveys in several dzongkhags to map groundwater potential. Initial findings suggest that alluvial aquifers in the southern foothills and some inner valley floors have significant potential, while the crystalline rock formations of the central and northern highlands offer more limited groundwater resources.^[7]

Rainwater harvesting has been promoted as a complementary source, particularly in areas where springs are declining. The government and UNICEF have supported pilot programmes for household and institutional rainwater harvesting systems, especially in schools and rural health centres. While Bhutan receives substantial annual rainfall — averaging 1,500-5,000 millimetres depending on elevation and aspect — the seasonal concentration of rainfall during the summer monsoon means that storage is essential for year-round supply. The feasibility and cost-effectiveness of rainwater harvesting at community scale remains under evaluation.^[6]

Challenges and Future Directions

Despite impressive progress, Bhutan faces several interconnected challenges in achieving truly universal and sustainable water and sanitation access. The maintenance and rehabilitation of aging rural water supply infrastructure requires sustained investment that cannot be fully met by community user fees alone. Rural-to-urban migration is simultaneously reducing the population base for maintaining rural systems and increasing demand on urban infrastructure. Water quality monitoring remains limited in many rural areas, where bacteriological contamination from livestock and inadequate source protection can compromise the safety of otherwise functional systems. And the impacts of climate change on water availability are expected to intensify in coming decades, requiring adaptive approaches to water resource management.^[1]

The Royal Government's long-term vision, articulated through the Gross National Happiness framework and successive Five-Year Plans, envisions universal access to safe, reliable, and sustainable water supply and sanitation as both a development target and a fundamental component of citizen well-being. Achieving this vision will require continued international partnership, increased domestic investment, innovative approaches to rural service delivery, and effective adaptation to the changing climate that is already altering the hydrology upon which Bhutan's water systems depend.

See also

• Water and Sanitation Access in Bhutan
• Clean Water Access in Bhutan

References

1. "Bhutan — Household Data." WHO/UNICEF Joint Monitoring Programme for Water Supply, Sanitation and Hygiene (JMP).
2. "Water, Sanitation and Hygiene (WASH)." UNICEF Bhutan.
3. "Urban Water Supply and Sanitation Project — Bhutan." Asian Development Bank.
4. "Bhutan: Overview." Asian Development Bank.
5. "Ministry of Works and Human Settlement." Royal Government of Bhutan.
6. "WASH Sector Review." UNICEF Bhutan.
7. "National Environment Commission." Royal Government of Bhutan.
8. "12th Five-Year Plan (2018-2023)." Gross National Happiness Commission, Royal Government of Bhutan.