Water is essential for life, yet for billions of people worldwide, access to safe, clean water remains a daily challenge. The consequences of this crisis extend far beyond thirst-contaminated water is a silent killer, transmitting deadly diseases and claiming millions of lives each year. Understanding the intricate relationship between water quality and human health is fundamental to building healthier, more resilient communities.
Table of Contents
- Waterborne diseases: a global health crisis
- How contamination occurs
- Schistosomiasis and vector-borne illnesses
- How schistosomiasis spreads
- The dengue connection: when water becomes a breeding ground
- Healthcare facilities: the frontline for water and hygiene
- The current state of WASH in healthcare settings
- Building safer healthcare environments
- Simple interventions, profound impact
- The path forward
Waterborne diseases: a global health crisis
The link between unsafe water and disease is well-documented and devastating. According to the World Health Organization, contaminated water can transmit diseases including diarrhoea, cholera, dysentery, hepatitis A, typhoid, and polio. These aren’t rare afflictions-they affect hundreds of millions of people globally, particularly in regions with inadequate water infrastructure.
Microbiologically contaminated drinking water causes approximately 505,000 diarrhoeal deaths each year. The burden falls disproportionately on the most vulnerable: roughly 1 million people die annually from diarrhoea resulting from unsafe drinking water, sanitation, and hand hygiene. What makes this tragedy even more profound is that these deaths are largely preventable-an estimated 395,000 deaths among children under five could be avoided each year if basic water safety measures were implemented.
Children are especially vulnerable to waterborne illnesses. Their developing immune systems struggle to fight off pathogens that adults might survive. UNICEF reports that hundreds of children under five die every day from diarrhoeal diseases that could have been prevented with basic water, sanitation, and hygiene services in their homes, health centres, and schools.
How contamination occurs
The primary source of dangerous water contamination is faecal matter. Globally, at least 1.7 billion people use drinking water sources contaminated with faeces. This contamination introduces bacteria, viruses, and parasites into water supplies, creating conditions for disease outbreaks. Inadequate management of urban, industrial, and agricultural wastewater further compounds the problem, leaving the drinking water of hundreds of millions of people dangerously contaminated.
Beyond microbial contamination, chemical pollutants pose additional health risks. Natural chemicals like arsenic and fluoride in groundwater can cause serious health problems, while lead contamination from aging water infrastructure adds another layer of danger.
Schistosomiasis and vector-borne illnesses
Beyond the well-known waterborne diseases, unsafe water exposes populations to parasitic infections that can cause chronic, debilitating illness. Schistosomiasis is an acute and chronic parasitic disease caused by blood flukes-parasitic worms that thrive in contaminated freshwater environments.
The scale of this neglected tropical disease is staggering. At least 251.4 million people required preventive treatment for schistosomiasis in 2021. The disease primarily affects poor and rural communities, particularly agricultural and fishing populations who have regular contact with infested water. Women performing domestic tasks like washing clothes in contaminated water face significant exposure risks.
How schistosomiasis spreads
People become infected when larval forms of the parasite-released by freshwater snails-penetrate the skin during contact with infested water. Unlike diseases spread through drinking water, schistosomiasis can be contracted simply by wading, bathing, or swimming in contaminated freshwater. The microscopic adult worms live in veins draining the urinary tract and intestines, where they lay eggs that cause tissue damage and long-term health complications.
In children, schistosomiasis can cause anaemia, stunting, and reduced learning ability. The WHO African Region estimates that at least 90% of those requiring treatment live in Africa, making it the second most economically significant parasitic disease after malaria in tropical regions.
The dengue connection: when water becomes a breeding ground
Water-related health threats extend beyond what we drink or touch. Insects that live or breed in water carry and transmit diseases such as dengue fever. Interestingly, some disease-carrying insects breed in clean water rather than dirty water, meaning even household drinking water containers can serve as breeding grounds for mosquitoes.
About half the world’s population is now at risk of dengue, with an estimated 100-400 million infections occurring annually. The Aedes aegypti mosquito, the primary dengue vector, is a daytime feeder that breeds and lays eggs in and around urban human habitation.
Prevention can be remarkably simple. Covering water storage containers can reduce vector breeding and may also reduce faecal contamination at the household level. The Pan American Health Organization recommends avoiding water collection in open containers, properly covering tanks and reservoirs, and eliminating garbage that could collect rainwater.
Healthcare facilities: the frontline for water and hygiene
When sick people seek medical care, they should enter an environment that promotes healing-not one that exposes them to additional health risks. Yet inadequate water, sanitation, and hygiene (WASH) services in healthcare facilities remain a critical global challenge.
Out of every 100 patients in acute-care hospitals, 7 patients in high-income countries and 15 patients in low- and middle-income countries acquire at least one healthcare-associated infection during their hospital stay. These infections can turn routine procedures into life-threatening events and undermine public trust in healthcare systems.
The current state of WASH in healthcare settings
WASH services in healthcare facilities across all regions fall short of WHO and national standards. Early surveys revealed alarming gaps: 38% of healthcare facilities examined lacked improved water sources, 35% lacked water and soap for handwashing, and 19% lacked improved sanitation.
These deficiencies have cascading effects. Quality healthcare cannot exist without reliable access to safe WASH facilities. The availability of WASH services, especially in maternity and primary care settings, supports core aspects of universal health coverage including quality, equity, and dignity for all patients.
Building safer healthcare environments
Basic WASH services and medical waste management in healthcare facilities are essential for safe and quality care. The COVID-19 pandemic highlighted just how critical these services are-handwashing stations, reliable water supplies, and proper waste disposal became frontline defenses against disease transmission.
WHO and UNICEF are working toward providing universal basic WASH coverage in healthcare facilities by 2030. This goal includes not just infrastructure but also hygiene education, waste management protocols, and environmental cleaning practices.
The provision of adequate water, sanitation and hygiene is an essential part of providing basic health services. WASH services in healthcare settings help prevent infectious disease spread and protect both staff and patients. Improving access to handwashing and sanitation facilities in healthcare settings can significantly reduce infection and mortality rates, particularly in maternal and child health.
Simple interventions, profound impact
While the scale of water-related health challenges may seem overwhelming, solutions often involve straightforward measures. Safe water, sanitation, and hygiene practices form a protective barrier against many of the diseases discussed above.
When water is not readily available, people may deprioritize handwashing, increasing the likelihood of diarrhoea and other diseases. Conversely, ensuring water access enables good hygiene practices that prevent disease transmission.
For vector-borne diseases like dengue, community engagement is essential. In Sri Lanka, a WHO campaign to educate communities about clearing mosquito breeding sites halved the number of hospital stays caused by dengue. Similar community-based programs in Mexico and Singapore have demonstrated that coordinated local action can significantly reduce disease incidence.
Schistosomiasis control focuses on periodic large-scale treatment with medication, combined with access to safe water, improved sanitation, hygiene education, and snail control. Countries including Brazil, China, Egypt, and Morocco have successfully implemented these comprehensive approaches.
The path forward
Progress has been made, but significant challenges remain. In 2022, 73% of the global population-6 billion people-used safely managed drinking water services. However, the remaining 2.2 billion still lack access, including 115 million people collecting untreated water directly from lakes, ponds, rivers, and streams.
Climate change, increasing water scarcity, population growth, and urbanization pose ongoing challenges for water supply systems. Meeting sustainable development goals will require accelerated investment in water infrastructure, stronger regulatory frameworks, and continued innovation in water treatment and delivery.
The economic case for investment is clear. Better water sources mean reduced healthcare costs, improved productivity, and better educational outcomes for children. When water comes from improved and more accessible sources, people spend less time collecting it and can be productive in other ways.
What do you think? How can communities balance traditional water practices with modern safety requirements, and what role should local governments play in ensuring healthcare facilities meet basic WASH standards?
References
- https://www.who.int/news-room/fact-sheets/detail/drinking-water
- https://www.unicef.org/water-sanitation-and-hygiene-wash
- https://www.who.int/news-room/fact-sheets/detail/schistosomiasis
- https://www.who.int/health-topics/schistosomiasis
- https://www.afro.who.int/health-topics/schistosomiasis-bilharzia
- https://www.who.int/news-room/fact-sheets/detail/dengue-and-severe-dengue
- https://www.who.int/activities/promoting-dengue-vector-surveillance-and-control
- https://www.paho.org/en/topics/dengue
- https://www.who.int/teams/environment-climate-change-and-health/water-sanitation-and-health-(wash)/health-care-facilities/wash-in-health-care-facilities
- https://www.wvi.org/clean-water-sanitation-and-hygiene-wash/wash-healthcare-facilities
- https://www.who.int/europe/activities/promoting-water-sanitation-and-hygiene-in-health-care-facilities
- https://www.worldbank.org/en/topic/water/brief/wash-water-sanitation-hygiene-and-covid-19
- https://en.wikipedia.org/wiki/WASH
- https://www.dengue.com/help-prevent-spread-dengue-through-your-home-and-community
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