Asia Faces a Triple Water Crisis Amid Climate Change Impacts

Asia is facing a triple water crisis: too much water in the form of flash floods, too little water due to droughts and scarcity, and dangerously high levels of water pollution.

According to Climate Impact Tracker, roughly 2 billion people in the Asia-Pacific region lack access to clean water and sanitation. Around 80% of wastewater is discharged untreated into the environment, contaminating vital freshwater sources such as rivers, lakes, and groundwater.

Rapid urbanisation, weak regulation, and poor governance of freshwater resources have intensified these challenges. Asia’s major rivers, including the Ganges, Citarum, and Mekong, are increasingly polluted.

In China, up to 90% of groundwater is contaminated by human, agricultural, and industrial waste, while around 70% of rivers and lakes are unsafe for human use.

Indonesia’s Citarum River, a critical water source for tens of millions of people, has suffered for decades from pollution from industrial discharges and household waste, contributing to diseases such as cholera and dermatitis.

The article highlights that stronger regulation, effective enforcement, and sustained infrastructure investment, estimated at around US$60 billion annually, are essential to protect and restore Asia’s freshwater systems.

Too much water: Floods and climate extremes

Asia is also increasingly affected by catastrophic flooding. In 2025, devastating floods displaced millions of people in Pakistan and India, while droughts and water shortages deepened hardship in Bangladesh and Sri Lanka. Himalayan glacial melt, increasingly erratic monsoon patterns, and outdated water-sharing arrangements are compounding the crisis.

India’s per capita freshwater availability is projected to fall below 1,000 cubic metres by 2025, placing the country firmly in “water-scarce” territory. Pakistan’s Indus River has already lost more than 30% of its flow, while excessive groundwater extraction in Bangladesh threatens long-term ecological collapse.

Meanwhile, Himalayan glaciers, an essential water source for hundreds of millions, are melting at unprecedented rates, reducing river flows and hydropower generation.

Progress and persistent risks

The Asian Development Bank’s Asian Water Development Outlook (AWDO) 2025, published in December 2025, reports that 2.7 billion people across Asia and the Pacific, around 60% of the region’s population, have been lifted out of the most severe forms of water insecurity since 2013. These gains reflect improved access to basic water and sanitation services, as well as increased protection from floods and droughts.

The AWDO assesses water security across 50 economies using five key dimensions: access to safe water and sanitation; water availability for agriculture and other sectors; the health of rivers, wetlands, and aquifers; and resilience to floods, droughts, and other water-related disasters.

However, the report warns that this progress is fragile and could be reversed by accelerating ecosystem degradation, intensifying climate shocks, and a widening financing gap.

Environmental decline and the financing gap

Wetlands, forests, rivers, and aquifers that underpin long-term water security are deteriorating rapidly across the region. Climate hazards such as rising sea levels, storm surges, and saltwater intrusion pose growing risks, particularly in a region that already accounts for 41% of global flood events. Recent floods across parts of Southeast and South Asia underscore the urgency of these threats.

The AWDO estimates that around US$4 trillion is required by 2040, equivalent to roughly US$250 billion per year to meet water, sanitation, and hygiene (WASH) needs alone. Closing this gap will require innovative financing mechanisms and stronger partnerships between governments, the private sector, and development partners.

The report calls for policy reforms that improve the efficiency and sustainability of water services, strengthen governance by empowering local institutions, and prioritise social inclusion to ensure that vulnerable communities are not left behind.