Clean Water and Sanitation: Essential Elements for Global Health

SDG 6 — Clean Water and Sanitation — is one of the most consequential of the United Nations' 17 Sustainable Development Goals. Water underpins every other dimension of human development: health, education, food security, gender equality, and economic productivity. Yet the global water and sanitation crisis remains one of the defining failures of modern development. This article examines what SDG 6 requires, who is still left behind, and what actions — at the individual, technological, and policy level — can close the gap before 2030.

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What Is SDG 6 Clean Water and Sanitation

SDG 6 is the United Nations Sustainable Development Goal to "ensure availability and sustainable management of water and sanitation for all" by 2030. Adopted in September 2015 as part of the 2030 Agenda for Sustainable Development, it replaced the narrower water and sanitation targets from the Millennium Development Goals and expanded their scope significantly.

SDG 6 addresses the complete water cycle — from freshwater source protection through distribution, use, wastewater treatment, and return to the environment. It treats water not merely as a commodity to be delivered but as a human right recognized by the United Nations General Assembly in 2010. The goal also covers transboundary water governance, recognizing that most major river basins cross national borders and require cooperative management.

SDG 6 sits within a broader ecosystem of interdependent goals. No poverty, zero hunger, good health and well-being, and gender equality are all compromised when communities lack safe water and sanitation. Progress on SDG 6 amplifies outcomes across the entire 2030 Agenda, making it a foundational rather than peripheral goal.

What Are the Key Targets of SDG 6

SDG 6 contains eight targets that together define universal, equitable, and sustainable water and sanitation. The most critical are:

• Target 6.1 — By 2030, achieve universal and equitable access to safe and affordable drinking water for all.
• Target 6.2 — By 2030, achieve access to adequate and equitable sanitation and hygiene for all and end open defecation, with special attention to women, girls, and those in vulnerable situations.
• Target 6.3 — By 2030, improve water quality by reducing pollution, eliminating dumping, and minimizing release of hazardous chemicals; halve the proportion of untreated wastewater; and substantially increase recycling and safe reuse.
• Target 6.4 — By 2030, substantially increase water-use efficiency across all sectors and ensure sustainable withdrawals to address water scarcity.
• Target 6.5 — By 2030, implement integrated water resources management at all levels, including through transboundary cooperation.
• Target 6.6 — By 2020 (a missed target), protect and restore water-related ecosystems, including mountains, forests, wetlands, rivers, aquifers, and lakes.
• Target 6.a — Expand international cooperation and capacity-building support for water and sanitation in developing countries.
• Target 6.b — Support and strengthen the participation of local communities in improving water and sanitation management.

The distinction between "basic" and "safely managed" service levels is central to SDG 6 measurement. A "basic" water service means using an improved source within a 30-minute round trip. A "safely managed" service means the source is located on premises, available when needed, and free from contamination. Most global progress statistics report on basic access; the bar for safely managed is substantially higher, and progress toward it has been slower.

Related goals reinforce SDG 6 in important ways. Affordable and clean energy is required to power water pumps and treatment plants. Climate action determines the future availability of freshwater resources. Partnerships for the goals mobilize the financing and expertise that governments alone cannot provide.

How Many People Lack Access to Clean Water

According to the 2023 WHO/UNICEF Joint Monitoring Programme (JMP) report, 2.2 billion people worldwide lack access to safely managed drinking water services. Of these, 703 million people still rely on unsafe sources including untreated surface water from rivers, ponds, and unprotected wells. Another 1.5 billion use improved but not safely managed sources — water that is collected off-premises, unreliable, or potentially contaminated.

On the sanitation side, 3.5 billion people lack safely managed sanitation services. Approximately 419 million people still practice open defecation — a number that has fallen substantially since 2000 but remains concentrated in sub-Saharan Africa, where progress has stalled. Open defecation contaminates groundwater, surface water, and soils, creating feedback loops that undermine nearby water infrastructure.

The geographic distribution of the crisis is uneven. Sub-Saharan Africa and Central and Southern Asia account for the majority of the unserved population. Rural areas are far more likely to lack services than urban ones, but rapidly growing urban informal settlements are emerging as a major gap in officially reported coverage statistics. Water inequality tracks closely with income inequality — the poorest quintile of households in low-income countries are least likely to have piped water, most likely to pay the highest per-litre prices from water vendors, and least likely to receive government investment in infrastructure.

Progress since 2015 has been insufficient. The UN SDG Progress Report 2023 warned that at current rates, 1.6 billion people will still lack safely managed water by 2030, and 2.8 billion will still lack safely managed sanitation. The world is not on track.

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What Are the Health Impacts of Unsafe Water and Sanitation

Unsafe water and inadequate sanitation are among the most powerful determinants of preventable death and disease globally. The WHO estimates that contaminated drinking water causes more than 500,000 diarrheal deaths per year. When sanitation failures are included — open defecation, unmanaged fecal sludge, and inadequate handwashing facilities — the burden rises dramatically. UNICEF reports that approximately 1,000 children under five die every day from diarrheal diseases linked to unsafe water, sanitation, and hygiene (WASH).

The pathogens most directly linked to inadequate WASH include:

• Cholera — Caused by Vibrio cholerae in fecally contaminated water. Explosive outbreaks occur in settings where sanitation infrastructure has collapsed, as seen recently in Haiti and Yemen.
• Typhoid fever — Caused by Salmonella typhi; 9–21 million cases annually, with antimicrobial-resistant strains spreading in South Asia and sub-Saharan Africa.
• Rotavirus and other enteric viruses — Leading causes of severe childhood diarrhea; vaccines exist but inadequate WASH perpetuates transmission even in vaccinated populations.
• Hepatitis A and E — Transmitted via fecally contaminated food and water; disproportionately affect displaced populations in humanitarian settings.
• Schistosomiasis and soil-transmitted helminths — Parasitic infections affecting 1.5 billion people globally, tightly linked to contact with contaminated freshwater and lack of sanitation.

Beyond infectious disease, unsafe water carries water pollution burdens including arsenic, fluoride, nitrates, and lead — contaminants that cause chronic conditions including cancer, skeletal fluorosis, methemoglobinemia in infants, and neurodevelopmental impairment. These chemical hazards often receive less attention than biological pathogens but affect hundreds of millions of people across Bangladesh, India, China, and parts of Latin America.

The relationship between water, sanitation, and malnutrition is increasingly recognized. Recurrent gut infections from poor WASH cause environmental enteric dysfunction — a chronic inflammatory condition that impairs nutrient absorption and contributes to stunting even when caloric intake appears adequate. Stunting affects 148 million children under five and has lifelong consequences for cognitive development and economic productivity. Addressing water and sanitation is therefore inseparable from addressing food security and child development.

The links between poverty and health are reinforced at every level by water insecurity. Low-income households that lack safe water spend disproportionate shares of income on water purchases, healthcare for waterborne illness, and lost work time — a compounding cycle that keeps families trapped in poverty.

How Does Water Scarcity Affect Economic Development

The World Bank estimates that inadequate water supply and sanitation cost the global economy approximately $260 billion per year through lost productivity, healthcare expenditure, and missed educational opportunities. This figure understates the full economic cost because it excludes the indirect drag on agricultural output, industrial investment decisions, and long-run human capital formation.

Water and development are structurally linked. Agriculture consumes roughly 70% of all freshwater withdrawals globally. In water-stressed agricultural regions, crop failures and reduced yields drive rural poverty, food insecurity, and migration to urban areas. The World Resources Institute's Aqueduct tool identifies 17 countries — including India, Pakistan, and Mexico — where high and extremely high water stress affects more than 1 billion people and poses severe risks to food production capacity.

Industry and manufacturing are similarly constrained. Energy production — whether thermal, hydroelectric, or cooling-dependent — requires large and reliable water supplies. Textile manufacturing, semiconductor fabrication, and food processing are all water-intensive. Multinational companies increasingly factor water risk into facility siting decisions, meaning that water scarcity deters foreign direct investment in the regions that most need it.

The gender dimension of water's economic impact is profound. In sub-Saharan Africa and South Asia, women and girls are primarily responsible for household water collection. Studies by WHO and the International Water Management Institute find that women in water-scarce households spend an average of 6 hours per day collecting water. This time cost directly reduces labor market participation, school attendance, and community engagement. When water access improves, the economic returns accrue disproportionately to women: girls stay in school longer, women enter paid employment, and household income rises. Closing gender inequality in water burden is therefore both a development and an economic imperative.

The costs of inaction accumulate across generations. Child poverty is perpetuated when waterborne illness forces families into cycles of medical debt and lost schooling. A child who misses school due to diarrheal illness is a child less able to access the quality education that breaks intergenerational poverty. The economic case for investment in water and sanitation is among the clearest in development economics: the WHO estimates that every dollar invested in WASH yields $4–$34 in economic returns depending on the intervention.

The sustainable water supply challenge is not just about quantity — water quality degradation through industrial discharge, agricultural runoff, and inadequate wastewater treatment imposes its own economic penalties. Currently, approximately 80% of all wastewater is discharged untreated into rivers, lakes, and coastal waters, according to UNESCO. This destroys fisheries, contaminates irrigation supplies, and imposes remediation costs that far exceed the cost of treatment at source.

What Technologies Improve Water Access in Developing Countries

Technology is not a substitute for governance and financing, but it has substantially expanded the range of viable solutions for communities that lack reliable water infrastructure. The most impactful clean water technology deployments share a common characteristic: they are appropriate to local context in terms of cost, maintenance requirements, and operator capacity.

Key technologies currently delivering results at scale include:

• Biosand filtration — A low-cost household or community-level treatment method using layers of sand and gravel to remove pathogens and turbidity. CAWST (Centre for Affordable Water and Sanitation Technology) has documented deployments in over 70 countries with consistent removal of 95–99% of pathogens when properly maintained.
• Solar-powered water pumping and purification — Photovoltaic pump systems have become cost-competitive in off-grid settings, enabling boreholes and piped distribution systems in communities without reliable electricity. Combined with UV or chlorine disinfection, they can deliver safely managed water at low operating cost.
• Ceramic and membrane filtration — Ceramic pot filters provide point-of-use treatment at household level. Ultrafiltration membrane systems are increasingly deployed at community scale, offering reliable pathogen removal without chemical inputs.
• Atmospheric water generation (AWG) — In high-humidity coastal and tropical regions, devices that extract moisture from air can supplement conventional supply. While still relatively expensive per litre, AWG is increasingly viable for institutional applications in humidity-rich environments.
• IoT-enabled water quality monitoring — Low-cost sensors deployed at water points and distribution nodes transmit real-time data on turbidity, pH, chlorine residual, and bacterial indicators. This enables rapid detection of contamination events and predictive maintenance of infrastructure, reducing service failures. Organizations including Remote Area Medical and Aquaya Institute have piloted these systems across East Africa and South Asia.
• Mobile payment water kiosk models — Community water enterprises that integrate metered dispensing with mobile money platforms (M-Pesa, bKash) have demonstrated sustainable cost recovery in Kenya, Tanzania, and Bangladesh, enabling rural water points to be professionally operated and maintained.

On the sanitation side, container-based sanitation (CBS) — where sealed toilet containers are collected and treated like waste — has gained traction in dense urban informal settlements where pit latrines and sewers are both impractical. Sanergy and SOIL are two organizations that have demonstrated CBS models with full fecal sludge treatment and nutrient recovery at scale in Nairobi and Haiti respectively.

The frontier of water testing is also advancing rapidly. Portable molecular diagnostic tools that previously required laboratory infrastructure can now detect specific pathogens and chemical contaminants in the field, enabling evidence-based intervention rather than proxy indicators like turbidity alone.

No single technology solves the water access problem. What matters is system design: matching technology to local hydrogeology, ensuring spare parts supply chains, training local operators, and embedding water points within governance structures that sustain them beyond the initial project cycle. The organizations doing this well — such as clean water organizations like Water for People, IRC WASH, and WaterAid — consistently prioritize sustainability over speed of installation.

How Does Climate Change Threaten Water Security

Climate change is the single largest long-run threat to global water security, operating through multiple simultaneous mechanisms that interact to destabilize water availability, quality, and infrastructure. The IPCC Sixth Assessment Report (2021–2022) identified water-related hazards as the primary pathway through which climate change affects human welfare, food systems, and ecosystems.

The principal mechanisms through which climate change threatens water security include:

• Glacial retreat — Mountain glaciers supply dry-season water to hundreds of millions of people in Asia and Latin America. The Hindu Kush Himalaya, Andes, and Alps are all losing ice mass at accelerating rates. Communities dependent on glacier-fed rivers face an initial period of increased flow followed by permanent reduction — a "peak water" transition already underway in parts of Bolivia and northern India.
• Intensified drought cycles — Higher temperatures increase evapotranspiration, reducing soil moisture and groundwater recharge. Droughts that historically occurred every 10 years are now occurring every 5–6 years across the Horn of Africa, southern Europe, and western North America. Drought simultaneously reduces surface water availability and drives over-extraction of groundwater supplies.
• Intensified flooding and contamination events — More intense precipitation events increase runoff and overland flow that overwhelms wastewater treatment infrastructure, contaminates water storage systems, and damages distribution networks. Flood events are a leading cause of cholera outbreaks because they overwhelm sanitation systems and carry fecal matter into drinking water sources.
• Sea-level rise and saltwater intrusion — Coastal aquifers, which supply freshwater to hundreds of millions of people in low-lying deltaic regions including Bangladesh, Vietnam, and Pacific Island nations, are increasingly subject to saltwater intrusion as sea levels rise and freshwater recharge is reduced.
• Increased water temperature and algal blooms — Warmer surface waters promote the growth of cyanobacteria (blue-green algae), which produce toxins harmful to humans and aquatic life. Harmful algal blooms have closed water intakes across the United States, Europe, and Australia with increasing frequency since 2000.

The intersection of climate change and water security is inseparable from health and environmental outcomes. Water stress accelerates land degradation, undermines biodiversity and life on land, and drives the migration and conflict that compromise sustainable city development.

Climate-resilient water infrastructure — designed with climate projections rather than historical averages — is no longer optional. This means oversizing storage capacity, building redundancy into distribution systems, protecting watershed catchments, and integrating managed aquifer recharge to buffer seasonal variability. The additional cost of climate-proofing water infrastructure is estimated at 10–20% — a fraction of the cost of failure and emergency response.

What Role Does Sanitation Play in Public Health

Sanitation — the safe management of human excreta from containment through transport, treatment, and final disposal — is the single most cost-effective public health intervention available to low-income communities, according to the WHO. The relationship between sanitation and health operates through multiple pathways simultaneously, making its impact broader than any single disease intervention.

The primary health mechanism is the interruption of fecal-oral transmission pathways. Human feces contain concentrations of pathogens — bacteria, viruses, protozoa, and helminth eggs — that, if not safely contained, contaminate hands, food, soil, flies, and water. The "F-diagram" (Feces, Fingers, Flies, Fields, Food, Fluids) maps the routes by which pathogens travel from one person's feces to another person's mouth. Sanitation infrastructure — toilets, handwashing facilities, and treatment systems — interrupts this transmission at multiple points simultaneously.

Sanitation access gaps are measured in terms of the JMP ladder: open defecation, unimproved facilities (pit latrines without slabs), limited facilities (shared with other households), basic facilities (private improved latrine or toilet), and safely managed facilities (where excreta is safely treated on-site or transported to a treatment facility). Each rung of the ladder carries a different disease burden reduction profile.

Beyond individual health outcomes, community-level sanitation coverage produces non-linear health returns. When open defecation rates fall below 10–20% within a community, pathogen concentrations in the environment drop sharply, benefiting even households with improved sanitation. This community-level effect means that the marginal health return to each additional toilet installed increases as coverage rises — the opposite of diminishing returns. This is the epidemiological rationale for community-led total sanitation (CLTS), which targets behavior change at community scale rather than subsidizing individual latrine construction.

Sanitation is also central to school attendance and educational outcomes. Schools without separate, functional toilets for boys and girls have lower enrollment and higher dropout rates, particularly for adolescent girls during menstruation. The links between gender equality and sanitation are direct: gender-sensitive sanitation — separate facilities with menstrual hygiene management provisions — is a prerequisite for girls completing secondary school in many low-income countries.

Nutrition outcomes are also directly affected. The link between inadequate sanitation and malnutrition runs through environmental enteric dysfunction (EED), a subclinical inflammatory condition caused by chronic gut pathogen exposure that impairs nutrient absorption. Children growing up in environments with high open defecation rates have higher rates of stunting even when dietary intake is adequate — demonstrating that food alone cannot address malnutrition where sanitation is absent.

Which Countries Have Made the Most Progress on SDG 6

Progress on SDG 6 has been uneven globally, but several countries stand out for having achieved substantial improvements in water access and sanitation coverage through systematic national programs — not just donor-funded projects.

Rwanda has achieved near-universal basic water coverage through a decentralized district-level water authority system with national performance targets and public accountability. The government's WASH sector strategic plan integrates water access, sanitation, and hygiene promotion within a single ministry framework with clear financing mechanisms. Rwanda's approach has been cited by the World Bank as a model for low-income countries with limited natural water resources.

Bangladesh achieved near-elimination of open defecation by 2019 — a transformation from a baseline of over 40% open defecation in 1990 — through community-led total sanitation (CLTS) approaches that catalyzed community behavior change without per-latrine subsidies. The CLTS model, developed in Bangladesh by Kamal Kar, is now applied in over 60 countries. Bangladesh continues to face significant challenges with arsenic contamination of groundwater — affecting 20 million people — demonstrating that access gains can be undermined by quality failures.

Ethiopia expanded rural water access coverage from approximately 25% in 2000 to over 60% by 2022 through its One WASH National Program, a government-led platform that coordinates multi-donor financing under a single national framework. The program's emphasis on local government capacity and community-level water committees has improved sustainability of infrastructure compared to previous project-based approaches.

Indonesia reduced open defecation from 24% to below 1% between 2015 and 2022, largely through its STBM (Sanitasi Total Berbasis Masyarakat) program — a national adaptation of CLTS with government financing for behavior change facilitation at village level.

India's Swachh Bharat Mission (Clean India Mission), launched in 2014, is the largest sanitation program in human history by scale of investment. It constructed over 100 million household toilets between 2014 and 2019, officially declaring India open-defecation free in October 2019. Independent assessments suggest actual usage rates remain below construction rates, highlighting the gap between infrastructure provision and behavior change — a challenge that all large sanitation programs face.

Countries that have made the least progress on SDG 6 are concentrated in sub-Saharan Africa — particularly in fragile and conflict-affected states — and in pockets of Pacific island nations. The common factors are: insufficient domestic public financing, fragmented sector governance across multiple ministries, limited capacity at local government level, and in some cases, geographic challenges of low population density that make networked infrastructure uneconomical.

How Can You Help Improve Water Access Today

The water and sanitation crisis is solvable within a generation — the financing gap, while substantial, is not insurmountable, and proven technologies and approaches exist. The question is whether sufficient political will, private commitment, and individual action will be mobilized at scale. There are concrete actions available at every level.

As an individual consumer:

• Support clean water organizations with demonstrated impact and financial transparency — including WaterAid, Water.org, IRC WASH, and charity: water. Look for organizations that publish coverage and functionality data, not just installation counts.
• Reduce your own water footprint by fixing leaks, installing efficient fixtures, and making water-conscious food choices. Animal agriculture accounts for roughly 30% of global freshwater use; reducing beef consumption is the single most impactful dietary change for water conservation.
• Support brands and companies with credible water stewardship commitments, verified through the Alliance for Water Stewardship standard or similar third-party frameworks.
• Purchase from mission-driven retailers like Impact Mart's Every Drop Counts collection, where 30% of profits fund clean water and sanitation projects directly.

As a citizen:

• Advocate for your government to meet the UN commitment to allocate 0.7% of gross national income to official development assistance, with an appropriate share directed to WASH.
• Engage with municipal water governance — attend public hearings, review water utility annual reports, and hold local officials accountable for service quality and affordability.
• Support decent work and economic growth policies that raise incomes in water-insecure communities, since household income is the strongest predictor of sustainable water access improvement.

As a professional or business:

• Conduct water risk assessments using tools like the WRI Aqueduct platform to identify physical, regulatory, and reputational water risks in your supply chain and operations.
• Invest in watershed protection and groundwater recharge programs in your areas of operation — these generate long-run cost savings while improving water scarcity outcomes for surrounding communities.
• Include water access and sanitation criteria in supplier codes of conduct, particularly for supply chains in water-stressed regions.

The path to SDG 6 by 2030 is technically clear: we know what interventions work, at what cost, and at what scale. The gap is not in knowledge but in prioritization, financing, and accountability. Every action that closes the distance between current performance and target — whether through individual consumption choices, institutional investment, or policy advocacy — contributes to the goal that water advocates have been working toward for decades: a world where no one dies for lack of safe water.

Explore more on related themes: water and development, sustainable water supply, water scarcity, sanitation access, water inequality, wastewater treatment, water pollution, water storage, water testing, no poverty, zero hunger, good health and well-being, gender equality, climate action, life on land, sustainable cities, health and the environment, poverty, poverty and health, food security, malnutrition, gender inequality, child poverty, quality education, affordable and clean energy, decent work and economic growth, partnerships for the goals.

For an in-depth look at the financial dimensions of the water crisis, read our report on global water bankruptcy and what SDG 6 means for business in 2026.

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