Water and Sanitation Access in Bhutan

Water and sanitation access in Bhutan presents a complex picture in which headline statistics of near-universal coverage coexist with significant qualitative gaps, geographic disparities, and emerging threats. According to the 2023 National Health Survey, 99.7 percent of households have access to improved drinking water sources, and in November 2022 the government officially declared Bhutan 100 percent open-defecation-free (ODF).^[1] However, these aggregate figures mask persistent problems including seasonal water shortages, contaminated supplies, drying sources attributed to climate change, uneven sanitation quality in rural areas and institutions, and inadequate urban wastewater treatment — all in a country that is paradoxically one of the most water-rich in South Asia.

Drinking Water Access

Bhutan has made substantial progress in extending piped water supply to its population. The Rural Water Supply Scheme (RWSS) has been the primary vehicle for delivering water to communities outside urban areas, using gravity-fed systems that channel mountain spring water through pipes to collection points and household taps. Over 98.9 percent of households are reported to have access to basic safe drinking water.^[2]

However, "access" as measured by surveys typically refers to the presence of an improved water source within a reasonable distance, not necessarily to the reliability, safety, or year-round availability of that source. Many rural water supply systems experience seasonal interruptions, particularly during the dry winter months when spring flows diminish. Systems are often gravity-fed from single sources with no backup, making them vulnerable to drought, landslides, and infrastructure damage.

Water Source Depletion

One of the most alarming trends is the progressive drying of water sources across the country. Of a total 7,399 water sources surveyed nationally, 69 have already dried up completely and 1,856 are in the process of drying — meaning approximately 26 percent of water sources face some level of depletion.^[3] Countrywide, an estimated 35 percent of sources show reduced flow. Dried-up sources have been documented in 29 communities comprising 527 households where RWSS infrastructure had already been installed, leaving the infrastructure functional but without adequate supply.

The drying is attributed primarily to extended dry seasons, higher evaporative demand associated with rising temperatures, and changes in precipitation patterns linked to climate change. Deforestation and land-use changes in some watersheds have also contributed to reduced groundwater recharge. For affected communities, the practical consequence is that women and children — who typically bear the responsibility for water collection — must walk longer distances to alternative sources, a reality that the headline coverage statistics do not capture.

Water Quality

Access to water and access to safe water are not the same. A longitudinal study of drinking water quality surveillance from 2017 to 2024, published in the Journal of Water and Health, found that microbial compliance — the proportion of water samples meeting safety standards for bacterial contamination — remained very low throughout the study period with no significant improvement trend.^[4] This indicates that while water is physically reaching more households, the water being delivered frequently fails to meet health-based quality standards, exposing populations to waterborne diseases including diarrhea — a significant contributor to child malnutrition and mortality.

Rural water supply systems in Bhutan typically rely on chlorination for treatment, but maintenance of chlorination equipment and regular testing are inconsistent, particularly in remote areas. The mountainous terrain and dispersed settlement pattern make systematic water quality monitoring logistically difficult and expensive.

Sanitation Progress and Gaps

Bhutan's declaration of 100 percent ODF status in November 2022 represented a major milestone. The achievement was supported by the SNV-implemented Sustainable Sanitation and Hygiene for All (SSH4A) program and UNICEF's Water for Women initiative, which worked through community-led total sanitation approaches across all 20 dzongkhags.^[1] Coverage rose from approximately 50 percent in 2020 to the declared 100 percent by late 2022.

However, overall access to basic sanitation services is estimated at only 63 percent of the population, with most deficits in rural areas.^[2] The gap between ODF status and basic sanitation access reflects the difference between the elimination of open defecation (which may be achieved with basic pit latrines) and access to improved sanitation facilities that safely contain and manage waste. Many rural latrines are basic structures that may not meet the criteria for "improved" sanitation under international definitions.

Institutional WASH Gaps

Water and sanitation access in schools and religious institutions remains a concern. Approximately one in five schools in Bhutan lacks water for handwashing with soap and functional toilets. Among monastic institutions, about 34 percent lack proper sanitation facilities and approximately 65 percent lack adequate water supply.^[2] Given the significant number of young monks and nuns in Bhutan's monastic education system, these gaps affect a vulnerable population often overlooked in national WASH programming.

Urban Sewage and Wastewater

As Thimphu and other urban areas grow rapidly due to rural-urban migration, urban water and sewage management faces increasing strain. Thimphu's sewage treatment capacity has not kept pace with population growth, and wastewater discharge into the Wang Chhu and other rivers has raised water quality concerns downstream. The challenge of extending sewage networks to rapidly developing peri-urban areas, combined with the capital costs of treatment infrastructure, represents a growing urban environmental issue.

Climate Change and Water Security

Climate change poses a fundamental long-term threat to Bhutan's water security. The country's water availability depends heavily on glacial meltwater, seasonal monsoon precipitation, and spring-fed systems — all of which are sensitive to climate variability. The UNDP has identified Bhutan's water sector as highly vulnerable to climate change, particularly through increased flood risk, more frequent and severe droughts, and the long-term decline of glacial reserves.^[5]

The Advancing Climate Resilience of the Water Sector in Bhutan (ACREWAS) project, supported by the Green Climate Fund and UNDP, aims to strengthen climate resilience in the water sector. The government's 2024 Guideline for Inclusive and Climate-Resilient Rural Water Supply Services represents an effort to integrate climate adaptation into WASH infrastructure planning.^[3]

International Support

UNICEF has been a partner in Bhutan's WASH sector since 1974, marking over 50 years of collaboration. SNV Netherlands Development Organisation, the World Bank, the Asian Development Bank, and bilateral donors including Japan and Denmark have all contributed to water and sanitation infrastructure and programming. The Water for Women Fund, an Australian government initiative, has supported gender-responsive and socially inclusive WASH programming in Bhutan.

See also

• Clean Water Access in Bhutan
• Water and Sanitation in Bhutan
• SIM Cards and Internet Access for Visitors to Bhutan
• The Electricity Access Paradox in Bhutan

References

1. Bhutan achieves 100 per cent Open Defecation Free with access to improved sanitation — UNICEF Bhutan, 2022
2. WASH: Water, Sanitation and Hygiene — UNICEF Bhutan
3. Guideline for Inclusive & Climate-Resilient Rural Water Supply Services 2024 — Ministry of Infrastructure and Transport
4. Drinking water quality surveillance in Bhutan: trend and compliance (2017-2024) — Journal of Water and Health, 2025
5. Water and Climate Change — UNDP Bhutan
6. SSH4A in Bhutan — SNV