Water security in East Asia: Climate change is deepening the inequality divide

On World Water Day 2026, East Asia stands at a critical crossroads. Climate change is transforming water, once a foundation of economic growth and social stability, into one of the region’s sharpest drivers of inequality. And this inequality is not evenly felt. It falls hardest on women and girls, children, persons with disabilities, and rural and marginalised communities whose access to safe water was already fragile. 

Across the region, the climate crisis is experienced through water: too much, too little, or too contaminated to drink. When water systems fail, they fail unequally. What may be an inconvenience for some becomes a crisis for those living in informal settlements, remote villages, or with limited mobility. This year’s theme, “Where water flows, equality grows,” captures the profound truth. But it also reminds us of its opposite: where water fails, inequality deepens. 

Water: The Frontline of Climate Disruption 

From the Mekong Delta to the highlands of Mongolia, predictable hydrological cycles that once sustained agriculture, cities, and livelihoods are being replaced by volatility. Rising temperatures accelerate evaporation and increase demand. Rainfall patterns are shifting. Extreme weather events are intensifying. 

Floods overwhelm sanitation systems and contaminate drinking water. Droughts reduce groundwater recharge and strain already fragile supply networks. Sea level rise drives saltwater intrusion into coastal aquifers, rendering previously reliable water sources unsafe. Water has become the primary medium through which the climate crisis is felt. 

In rapidly urbanising cities, infrastructure built for yesterday’s climate is being pushed beyond its limits. Intense rainfall events trigger sewer overflows and flood low-income settlements. During prolonged dry spells, water pressure drops or disappears altogether. Informal communities, often located in flood-prone or marginal lands, bear the brunt of these shocks. 

Climate change is not only reducing water security. It is exposing how unevenly that security was distributed in the first place. 

The Hidden Time Tax on Women and Girls 

Globally, in seven out of ten households without water on their premises, women and girls are responsible for collecting it1. In East Asia, as climate pressures intensify, this burden is growing heavier. When wells dry up or sources are contaminated, women and girls walk farther and wait longer. Each additional hour spent securing water is an hour stolen from education, income-generating work, or rest, a growing “time tax” that quietly reinforces gender inequality. 

Water insecurity also heightens protection risks. Longer journeys to remote water sources increase exposure to harassment and violence. The physical toll of carrying heavy loads over long distances compounds health challenges. Climate change is not gender-neutral. It amplifies existing inequalities, and without deliberate intervention, those inequalities will widen.  

Children at the Centre of the Crisis 

Across East Asia, an estimated 24 million vulnerable children still lack access to safely managed drinking water. 2This stark reality reminds us that behind regional progress are millions of young lives shaped by water insecurity. When climate-related disasters strike, children are often the first to feel the impact and the last to recover. Unsafe water continues to drive diarrhoeal disease, a leading cause of child illness and mortality. Flooded or damaged sanitation facilities disrupt schooling. During droughts, children miss class to help secure household water supplies. Water scarcity is not only an environmental or infrastructure challenge, but also a child rights issue, directly linked to health, nutrition, education, and protection. 

Progress toward Sustainable Development Goal 6, ensuring access to water and sanitation for all, underpins progress across nearly every other development goal. Without climate-resilient water systems, gains in education, gender equality, and poverty reduction cannot be sustained.  

The East Asia Water Paradox 

East Asia is often perceived as water-abundant, home to some of the world’s largest river systems and monsoon-driven rainfall. Basic water service coverage now exceeds 90 percent in much of the region. Yet “basic” does not mean resilient. 

Millions, particularly in rural and marginalised communities in Cambodia, Lao PDR, and Myanmar, still lack reliably safe water. Recent years have exposed the fragility beneath the progress. In Thailand, extreme rainfall has overwhelmed urban drainage systems once considered robust. In Viet Nam, powerful typhoons have damaged water infrastructure across entire provinces. In Cambodia, prolonged droughts and record heatwaves have dried river basins and forced families into seasonal migration. 

These are not isolated events. They are signals of a structural shift in which climate variability transforms perceived abundance into insecurity. One of the least understood dimensions of this shift is that scarcity can emerge even in wet years. Short, intense rainy seasons bring floods rather than dependable supply. Extended dry spells reduce groundwater recharge. Small, decentralised systems serving rural households often lack storage capacity and redundancy to manage these extremes. Communities can experience water shortages despite above-average annual rainfall. This is the new climate reality. 

Beyond Infrastructure: A Resilience Imperative 

Much of East Asia’s water infrastructure was designed for a climate that no longer exists. Rebuilding the same systems after each disaster is neither cost-effective nor sustainable. Success in the water sector can no longer be measured simply by counting taps and latrines. The central question must be whether systems remain safe, functional, and equitable under climate stress. 

Climate-resilient water security requires protecting watersheds so landscapes can absorb and regulate rainfall. It demands diversified water sources and storage systems capable of buffering shocks. It requires sanitation infrastructure that can withstand flooding, and integrated planning that aligns water management with broader climate and urban policies. Above all, it requires centring vulnerable communities, especially women and children, in decision-making and investment priorities. The cost of inaction will not only be measured in damaged infrastructure. It will be measured in children pulled from school, women pushed further into inequality, and decades of development progress reversed. 

East Asia is on the frontline of the climate crisis. But it can also be on the frontline of solutions. 

Investing in climate-resilient water systems today is far less costly than responding to repeated emergencies tomorrow. Governments, donors, civil society, and the private sector must treat water security as climate security, and as a foundation for equality, stability, and long-term growth. 

Because where water flows, equality can grow. But only if we act, with urgency, with equity, and before the next storm or drought determines a child’s future. 

Let us commit to a future where a child’s access to water isn't determined by the last storm or the next drought. 

About the Author 

Alexander Pandian is the Regional Water, Sanitation and Hygiene (WASH) Programme Senior Advisor for World Vision East Asia. He has 16 years of experience in the development sector. His expertise lies in WASH programme development, technical support and strategic planning. As the senior advisor for World Vision East Asia, he plays a vital role in overseeing strategic operations. His responsibilities include providing technical advice, coordinating technical and operational support for field offices across several countries in the region. He is part of the WASH Senior leadership team, where he ensures regional alignment with the World Vision Partnership’s strategic goals. 

For more info about World Vision East Asia WASH programmes, visit https://www.wvi.org/eastasia/clean-water-every-child