Drinking Water Around the World

The Global Picture: Access and Progress

Global progress on drinking water access has been significant over the past several decades. The proportion of the world's population with access to at least basic drinking water services has risen substantially, driven by infrastructure investment, international development efforts, and technological improvement.

However, safe, reliable, piped water in the home — what many people in higher-income countries take for granted — remains out of reach for a large share of the global population. Access to "safely managed" drinking water (meaning clean, available on premises, from an improved source) is considerably less widespread than basic access.

Geographic and socioeconomic factors are deeply intertwined with water access. Rural populations, marginalised communities, and people in regions experiencing conflict or climate stress tend to face the most significant barriers.

The WHO and UNICEF Joint Monitoring Programme (JMP) tracks global water access using a tiered service ladder ranging from unimproved sources through basic, safely managed, and ultimately piped on-premises supply. This framework is important because it recognises that not all "access" is equal — a protected communal well is a significant improvement over an unprotected surface source, but it is not the same as reliable water on tap inside the home. Progress measured at a lower tier can obscure significant remaining gaps at higher tiers.

Why Safe Water Access Varies So Much

Infrastructure investment is central to the story. Building, operating, and maintaining water treatment facilities and distribution networks requires sustained funding and institutional capacity. Countries with limited fiscal resources or governance challenges struggle to build and maintain this infrastructure.

Geography also plays a major role. Landlocked areas, regions with limited surface water, and places where aquifer depth makes drilling expensive face structural challenges that engineering alone cannot easily resolve.

Climate change is adding pressure. More frequent droughts stress surface water sources; more intense rainfall events can overwhelm treatment and distribution systems. This is affecting water security in regions that previously had reliable supplies.

Governance quality is a factor that often receives less attention than physical infrastructure but is equally important. Utilities need trained engineers and operators, functioning billing and revenue systems, and regulatory oversight to function sustainably. In many contexts, the challenge is not simply building infrastructure but maintaining it — pumps break, pipes corrode, and treatment chemicals run out without reliable procurement and financing systems in place.

Safe Water Challenges in Wealthy Countries

It is a mistake to assume that high national income guarantees uniformly safe water. Many higher-income countries have ageing water infrastructure that is costly to replace, and funding gaps have led to well-documented failures in some communities.

Lead pipe contamination events in some North American cities received global attention and revealed that infrastructure failures can persist for years before being fully addressed. Indigenous and rural communities in some wealthy nations have long experienced water quality that falls far below the national average.

These situations highlight that water equity is not only a global development issue — it exists within countries at all income levels.

Water and Gender: An Often Overlooked Dimension

In many parts of the world where piped water is unavailable, the task of collecting water falls disproportionately on women and girls. Walking long distances to collect water — sometimes for hours each day — represents a significant burden of unpaid labour that constrains time available for education, economic activity, and rest.

When water sources are close to home, girls in particular are more likely to attend school consistently. The connection between water access and educational and economic outcomes for women and girls is well-documented in development research, and it is one reason water access programmes that measure success beyond mere volume of water provided — considering time saved and who saves it — tend to produce broader social benefits.

Sanitation and water access are closely linked in this dimension. Private toilets near the home matter for girls' school attendance and for women's safety. Water, sanitation, and hygiene (WASH) programmes increasingly address these dimensions together rather than treating water supply in isolation.

The physical labour of water collection also has implications for health in communities where it is the norm. Carrying heavy containers of water — often on the head or back — over long distances causes musculoskeletal strain. The weight and distance involved varies by season: in dry periods, water sources may be much further away and water quality poorer, meaning more trips for less usable water. Reducing the collection burden through closer, reliable water points is therefore an intervention that affects health outcomes through multiple pathways simultaneously.

Community water management structures are another dimension worth noting. When water systems require local operation and maintenance — as is common with borehole and handpump installations — who participates in that management matters for sustainability. Development research has found that water committees with meaningful participation from women tend to maintain systems better, partly because women typically manage household water use and understand daily supply and quality concerns in more detail than those who are not the primary water collectors.

What the Research Says About Solutions

Evidence from international development research points to several factors that consistently improve outcomes: sustained infrastructure investment, effective regulation and enforcement, community-level management capacity, and integration of water and sanitation programmes together.

Point-of-use treatment — household filters, chlorination, and solar disinfection — has shown value in settings where centralised infrastructure is absent or unreliable. These solutions are more sustainable when communities are trained in maintenance and when ongoing supply chains for replacement parts exist.

Solar water disinfection (SODIS) is a low-cost method with a substantial evidence base for low-infrastructure settings. Filling clear plastic bottles with water and exposing them to direct sunlight for several hours inactivates pathogens through combined UV radiation and heat effects. It is not effective for turbid water and works best in sunny climates, but it requires no chemicals or specialised equipment — making it accessible in contexts where other options are not.

Ceramic pot filters — clay pots that provide slow filtration combined with some antimicrobial effect — have been deployed widely in low-income settings. They are locally producible in many countries, relatively durable, and effective when used consistently. Programme evaluations have found that consistent use over time is the key determinant of health outcomes, not the technical effectiveness of the filter alone — a reminder that water access interventions are as much about behaviour and social context as technology.

Desalination and Non-Conventional Sources

In water-scarce regions, desalination — removing salt from seawater or brackish water — has become an important water supply strategy. Countries in the Middle East, parts of North Africa, some small island states, and water-stressed regions of Australia and North America have invested heavily in desalination capacity.

The technology is mature and produces water that meets drinking standards, but it is energy-intensive, which creates both cost challenges and a carbon footprint concern. As renewable energy costs fall, the energy argument against desalination becomes weaker, and in some regions solar-powered desalination plants are already viable.

Rainwater harvesting, groundwater recharge, and wastewater recycling (sometimes called water reclamation or indirect potable reuse) are other strategies being deployed alongside conventional water management to increase resilience. Cities in Australia, Singapore, and parts of the United States have made treated recycled water part of their long-term supply planning.

Public acceptance of recycled water — treated wastewater returned to drinking supply — remains a significant challenge in many places even where the technology to produce it safely is well-established. This is sometimes described as the "yuck factor" in water management circles: technically safe and rigorously treated water that faces resistance based on its origin rather than its quality. Singapore's "NEWater" programme, which recycles treated wastewater to drinking standard, is often cited as a successful example of combining rigorous quality assurance with public communication to build acceptance over time.

Groundwater recharge — artificially replenishing aquifers with treated water during periods of surplus — is another strategy gaining attention. It effectively uses the aquifer as a large underground reservoir, banking water when available and drawing it down during drought. Managed aquifer recharge is used in various forms in parts of Australia, the United States, and the Netherlands. The natural filtration that occurs as water percolates through soil and rock provides additional treatment, and the stored water can be used flexibly as demand requires.

Water Safety Notes

When travelling to regions where tap water safety is uncertain, bottled water or point-of-use treatment are sensible precautions. Traveller's diarrhoea caused by waterborne pathogens is one of the most common health issues affecting international travellers.

If you are visiting a region and want to understand local water safety, look for guidance from public health authorities rather than relying on informal advice. See safe water practices for general guidance on drinking water safety in unfamiliar settings.

Environmental Perspective

The availability of safe water is inseparable from the health of water ecosystems. Rivers, lakes, and aquifers that are polluted, over-extracted, or degraded by land-use change become more difficult and expensive to treat for human use. Protecting source water quality is ultimately cheaper than removing contamination after the fact.

The environmental water issues guide explores the broader relationship between ecosystem health and water security. The choices that affect the environment — land management, industrial regulation, climate policy — are also choices about future water security.