English:Water Security
Water Security
Introduction
Water security means having reliable access to enough water of acceptable quality while also being protected from water-related risks such as drought, floods, and pollution. It includes the needs of people, farms, businesses, and ecosystems. Water security is not only about having a large amount of water. A place can receive plenty of rain and still be water-insecure if the water is polluted, difficult to reach, badly managed, or unavailable when it is needed.
This aiMOOC is designed for Grades 7–8. You will explore where freshwater comes from, why water security differs from place to place, how climate and human decisions affect water, and how communities can improve their water future. You will also practise reading evidence, comparing solutions, and making decisions about fair and sustainable water use.
The United Nations connects water security closely with Sustainable Development Goal 6, which calls for the availability and sustainable management of water and sanitation for all. Water also affects health, food, education, ecosystems, energy, and economic life.
What Water Security Means
A water-secure community needs several things to work together.
Enough water: There must be sufficient freshwater for drinking, cooking, hygiene, food production, local livelihoods, and ecosystems without using water faster than nature can replace it.
Safe water: Drinking water must be protected from harmful microorganisms and chemicals. Rivers, lakes, wetlands, and groundwater also need protection from pollution.
Reliable access: Water should be available when people need it. A source that works only during the rainy season may not provide secure access through the whole year.
Fair access: Water security includes affordability and inclusion. People should not be excluded because of where they live, their income, age, gender, disability, or other circumstances.
Protection from water risks: Water security also means reducing danger from droughts, floods, contamination, damaged infrastructure, and other disruptions.
Healthy ecosystems: Forests, soils, rivers, wetlands, lakes, and aquifers help store, filter, and move water. Protecting these systems supports both people and biodiversity.
UN-Water describes water security broadly: communities should be able to safeguard sustainable access to adequate quantities of acceptable-quality water while protecting against water-related pollution and disasters and preserving ecosystems.
Water Security Is More Than Water Scarcity
Water scarcity means that available water is not sufficient to meet needs, or that people cannot access the water that is available. Water security is broader. It considers quantity, quality, access, reliability, ecosystems, and risk.
A dry region can sometimes achieve relatively high water security through careful management, storage, efficient use, reuse, and reliable services. A wet region can still be water-insecure if floods damage infrastructure, sewage enters drinking-water sources, or some communities lack safe and affordable services.
The map below is a research-based water-security index for the early 2010s. Use it as a historical example of how researchers can combine information about water availability, access, safety, quality, and management. It is not a current live scorecard.
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The Global Picture
Access to safe water has improved for many people, but large gaps remain. According to the WHO/UNICEF Joint Monitoring Programme, in 2024 about 2.1 billion people still lacked safely managed drinking-water services. A safely managed drinking-water service uses an improved source that is on the premises, available when needed, and free from contamination. The same global monitoring reported that about 3.4 billion people lacked safely managed sanitation and about 1.7 billion people lacked basic hygiene services at home.
These numbers do not mean that every person in these groups has no water at all. They mean that the service does not meet all the conditions required for the relevant safely managed or basic service level.
Water insecurity is uneven. Rural and urban communities can face different problems. Some households may have water nearby but not consistently. Others may have reliable pipes but face pollution, high prices, or drought restrictions. Water security therefore needs local evidence rather than a single global answer.
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Where Freshwater Comes From
The Water cycle continually moves water through evaporation, condensation, precipitation, runoff, infiltration, groundwater flow, and storage. Most of Earth's water is salty ocean water. Freshwater is stored in ice, snow, lakes, rivers, soil, wetlands, and underground.
Surface Water
Surface water includes rivers, lakes, reservoirs, and wetlands. Communities may use it for drinking-water supplies, irrigation, transport, energy, and recreation. Surface water can change quickly during storms and droughts, so storage and careful management are important.
Groundwater
Groundwater is water stored below the surface in pores and cracks in soil and rock. An aquifer is a layer of rock or sediment that can store and transmit useful amounts of groundwater. Wells can reach aquifers, but pumping faster than recharge can lower groundwater levels.
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Recharge happens when water infiltrates through the ground and replenishes underground stores. Paved surfaces can reduce infiltration, while healthy soils, wetlands, and managed recharge projects can help water move into the ground in suitable places.
Rain, Snow, and Stored Water
Rain and melting snow can refill rivers, lakes, reservoirs, soils, and groundwater. A reservoir can store water from wetter periods for later use, but reservoirs also affect river ecosystems and can lose water through evaporation. Every storage choice has benefits and trade-offs.
Why Water Security Is Threatened
Water insecurity often results from several pressures happening at the same time.
Drought and Water Scarcity
A Drought is a long period with unusually low water availability for a place. Drought can reduce river flow, dry soils, lower reservoirs, stress crops, and increase pressure on groundwater. Water scarcity can also occur without drought when demand is very high or access is unequal.
Pollution
Water pollution can make water unsafe for people and ecosystems. Pollution may come from untreated sewage, industrial waste, mining, fertilizers, pesticides, oil, plastics, or polluted stormwater. Preventing pollution is usually easier and less expensive than cleaning it up later.
Turbidity means cloudiness caused by suspended particles. Turbid water is not automatically poisonous, but high turbidity can make treatment harder and may indicate that runoff has carried soil or contamination into the water.
Floods and Storms
Floods can be destructive even though they bring large amounts of water. Floodwater can damage wells, pipes, toilets, treatment plants, and roads. It can also mix sewage or chemicals into water sources. Water security therefore includes preparation for both too little water and too much water.
Climate Change
Climate change affects the water cycle by changing temperature, rainfall patterns, snow and ice, evaporation, and the frequency or intensity of some extreme events. The exact effects differ by region. Some places may face more severe drought risk, while others may face heavier rainfall and flooding. Planning for a range of possible conditions improves resilience.
Overuse and Damaged Ecosystems
When water is withdrawn faster than it is naturally renewed, rivers, wetlands, lakes, and aquifers can decline. Removing vegetation, draining wetlands, eroding soil, or paving large areas can also change how water is stored and filtered. Protecting catchments and ecosystems can be part of water infrastructure.
Infrastructure and Inequality
Pipes can leak, pumps can fail, and treatment systems need skilled workers, energy, maintenance, and money. Water insecurity can also be caused by unfair access. Two households in the same city may face very different levels of water security depending on service coverage, income, location, and reliability.
Water Quality, Sanitation, and Hygiene
WASH stands for water, sanitation, and hygiene. Safe drinking water is only one part of the system. Toilets, sewage collection, wastewater treatment, drainage, handwashing, and safe storage all help prevent contamination.
A water source may look clear and still contain harmful microorganisms or chemicals. You should never assume that untreated water is safe to drink based only on appearance. Public water systems use monitoring and treatment steps designed for local risks.
Common treatment steps can include screening, settling, filtration, and disinfection. The exact process depends on the source water and the standards that must be met.
Wastewater treatment protects rivers and groundwater by removing pollutants before water is released or reused. Properly treated wastewater can also become a useful resource for purposes such as irrigation, industry, groundwater recharge, or other approved uses, depending on local rules and treatment quality.
Solutions for Better Water Security
No single technology can solve every water problem. Strong water security usually combines engineering, ecosystem protection, conservation, fair rules, monitoring, finance, and community participation.
Use Water Efficiently
Water conservation reduces unnecessary demand. Homes and schools can repair leaks, use water-saving fixtures, and avoid waste. Farms can improve irrigation timing, soil health, and crop choices. Industries can measure water use, reuse water where safe, and prevent pollution.
A good conservation plan focuses first on large and preventable losses instead of blaming individuals for every water problem.
Harvest Rainwater Safely
Rainwater harvesting collects rain from roofs or other catchments for later use. Stored rainwater may be useful for gardens, toilet flushing, cleaning, or other non-drinking uses. Drinking use requires suitable materials, treatment, maintenance, testing, and compliance with local health rules.
Rainwater harvesting can reduce pressure on other sources and can also reduce stormwater runoff. Its usefulness depends on rainfall patterns, storage size, water quality, and demand.
Protect and Recharge Groundwater
Groundwater security improves when communities protect recharge areas, control pollution, monitor well levels, and keep pumping within sustainable limits. Managed aquifer recharge can direct suitable water into the ground under controlled conditions, but it requires careful design and water-quality protection.
Treat and Reuse Water
Water treatment makes water suitable for a particular use. High-quality treatment and monitoring are essential for drinking water. Wastewater treatment can make used water suitable for safe discharge or reuse. Reuse can reduce pressure on freshwater sources, but the treatment level must match the intended use.
Desalinate Salty Water
Desalination removes salts from seawater or brackish water. Reverse osmosis pushes water through membranes that block most dissolved salts. Desalination can provide a reliable supply in some coastal or dry regions, but it usually requires substantial energy, costs money, and creates concentrated brine that must be managed responsibly.
Work With Nature
Wetlands can store floodwater, filter some pollutants, support wildlife, and help regulate flows. Forests and healthy soils can reduce erosion and improve infiltration. Restoring ecosystems is sometimes called a nature-based solution when it is intentionally used to address human challenges while supporting biodiversity.
Plan for Emergencies
Water systems need plans for drought, floods, power failure, contamination, and broken infrastructure. Emergency storage, backup power, alternative sources, early warning, spare parts, and clear communication can help communities recover faster.
Fairness, Cooperation, and Decision-Making
Water decisions create trade-offs. Using more water for one purpose can leave less for another. A dam may store water and generate electricity but can also change river habitats and affect communities. A desalination plant may increase supply but use more energy and require brine management. A strong plan compares benefits, costs, risks, and who is affected.
Rivers, lakes, and aquifers often cross political borders. Cooperation between communities, regions, and countries can help them share data, agree on rules, reduce conflict, and protect common water sources.
Young people can participate in water security by collecting evidence, asking who is included in decisions, reducing waste, protecting local waterways, and communicating solutions. Good citizenship means checking evidence and considering different viewpoints rather than choosing a solution only because it sounds new or simple.
A Water-Secure School
Imagine that your school wants to become more water-secure. A useful plan would begin with evidence.
First, the school can measure where water comes from and how much is used. Next, students and staff can look for leaks, times of high demand, and places where drinking water or handwashing is unreliable. They can map drains, roofs, gardens, and nearby streams. They can also ask whether everyone can reach and afford safe water.
Possible actions might include fixing leaks, installing efficient taps, improving maintenance, planting drought-tolerant species, collecting rainwater for suitable non-drinking uses, preventing litter from entering drains, and preparing an emergency water plan. The best choices depend on local climate, rules, costs, and risks.
A water-security project is strongest when students measure conditions before and after an action. Evidence might include meter readings, photographs, interview notes, water-quality data from an approved source, maps, or records of how often a tap is out of service.
Reliable Sources and Further Reading
The following sources support the main scientific and global-development ideas in this aiMOOC.
- UN-Water: Water Security and the Global Water Agenda
- United Nations: Sustainable Development Goal 6
- WHO/UNICEF Joint Monitoring Programme: Progress on household drinking water, sanitation and hygiene 2000–2024
- UN-Water: Sustainable Development Goal 6 Synthesis Report 2026
Interactive Tasks
Quiz: Test Your Knowledge
Which statement best describes water security? (Reliable access to enough safe water while managing water-related risks) (!Having the largest possible reservoir in every community) (!Using only groundwater for all human needs) (!Receiving heavy rainfall during one season)
Which feature is required for a safely managed drinking-water service? (Water is available when needed and free from contamination) (!Water must come only from a river) (!Water must always be bottled) (!Water must be naturally warm)
What is an aquifer? (A layer of rock or sediment that stores and transmits groundwater) (!A machine that removes salt from seawater) (!A wall built only to stop ocean waves) (!A cloud that forms above a mountain)
Why can a flood reduce water security? (It can damage infrastructure and contaminate water sources) (!It permanently removes all water from a region) (!It always makes groundwater safe to drink) (!It stops every form of evaporation)
What is one useful purpose of rainwater harvesting? (Collecting rainfall for suitable later uses) (!Turning salt directly into drinking water) (!Making drought impossible) (!Replacing all water-quality testing)
Which action best helps protect groundwater? (Preventing pollution and keeping pumping within sustainable limits) (!Covering every recharge area with concrete) (!Pumping as fast as possible during dry weather) (!Pouring wastewater into unused wells)
What does desalination do? (Removes dissolved salts from seawater or brackish water) (!Adds sediment to drinking water) (!Changes groundwater into rain) (!Prevents all coastal flooding)
Why is wastewater treatment important for water security? (It can reduce pollution and support safe reuse) (!It guarantees unlimited freshwater) (!It removes the need for sanitation) (!It makes every river suitable for drinking without testing)
Which statement about climate change and water is most accurate? (It can alter rainfall, evaporation, drought risk, and flood risk) (!It affects every location in exactly the same way) (!It only changes ocean water and never freshwater) (!It makes water management unnecessary)
What is a strong first step in a school water-security project? (Collect evidence about water sources, use, reliability, and problems) (!Choose the most expensive technology immediately) (!Ignore people who experience unreliable access) (!Assume clear water is always safe to drink)
Memory Game
| Aquifer | Underground layer of rock or sediment that stores and transmits groundwater |
| Drought | Long period with much less water availability than usual for a place |
| Watershed | Land area where water drains toward a common outlet |
| Potability | Condition of water being safe for people to drink |
| Resilience | Ability of a community or system to cope with shocks and recover |
| Conservation | Careful use that reduces unnecessary water demand |
| Sanitation | Safe management of human waste and related hygiene services |
| Recharge | Process by which water enters the ground and replenishes underground stores |
Drag and Drop
| Match the correct terms. | Topic |
|---|---|
| Water scarcity | Not enough accessible water to meet needs |
| Groundwater recharge | Water moving into the ground to refill underground stores |
| Desalination | Removal of dissolved salts from seawater or brackish water |
| Wastewater treatment | Cleaning used water before safe release or approved reuse |
| Water conservation | Reducing unnecessary demand and avoidable losses |
...
Crossword Puzzle
| Aquifer | What underground layer stores and transmits groundwater? |
| Drought | What long dry condition can reduce rivers, reservoirs, and soil moisture? |
| Pollution | What problem can make a water source unsafe for people and ecosystems? |
| Sanitation | What system safely manages human waste and supports hygiene? |
| Reservoir | What stored body of water can help supply communities during dry periods? |
| Desalination | What process removes dissolved salts from seawater or brackish water? |
LearningApps
Cloze Text
Open-Ended Tasks
Easy
- Water conservation: Create a one-page poster showing five practical ways your school can reduce unnecessary water use and explain why each action matters.
- Water cycle: Draw a labelled local water-cycle diagram that includes precipitation, runoff, infiltration, groundwater, evaporation, and at least one human use.
- Water audit: Observe one school area for a day, record visible examples of water use or waste, and write three evidence-based improvement ideas without changing any plumbing yourself.
- Water communication: Record a one-minute audio or video message that explains water security to a younger student using one local example.
Standard
- Rainwater harvesting: Design a model rainwater-harvesting system for a school roof and explain the catchment, storage, intended non-drinking use, maintenance needs, and safety limits.
- Water pollution: Photograph or sketch possible pathways by which litter, soil, or pollutants could reach a local drain or stream, then propose prevention measures.
- Community interview: Interview a family member, school worker, farmer, gardener, or local water professional about changes they have noticed in water supply, quality, flooding, or drought; summarize the interview and separate observations from opinions.
- Water filtration: Build a classroom model filter using safe materials to compare how layers remove visible particles from muddy model water; record changes in turbidity and clearly state that the filtered model water is not safe to drink.
Advanced
- Water treatment: Visit or virtually investigate a drinking-water or wastewater-treatment facility and create a process diagram explaining how each major stage protects water quality.
- Water justice: Map differences in water access within a chosen community using reliable public data, identify who may face greater risks, and propose one fair improvement.
- Water management: Create a drought plan for a fictional town that must share limited water among households, farms, businesses, and ecosystems; justify priorities and explain trade-offs.
- Water security project: Produce a short documentary, digital story, or presentation comparing two water-security solutions for your region and recommend one combination based on cost, safety, reliability, ecosystem effects, and fairness.
Learning Assessment
- Water security analysis: Given a fictional community with seasonal drought, a polluted river, and a working groundwater well, explain its main water-security risks and rank three actions from highest to lowest priority with reasons.
- Solution comparison: Compare rainwater harvesting and desalination for two different locations and explain why the best choice depends on climate, geography, energy, cost, and intended use.
- System thinking: Create a cause-and-effect map showing how a drought can affect water supply, food production, ecosystems, health, and school life, including at least two feedbacks or connections.
- Evidence evaluation: Examine two claims about a local water problem, identify what evidence would be needed to test each claim, and explain which sources would be most trustworthy.
- Fairness and trade-offs: Write a recommendation for sharing water during a severe shortage while protecting basic human needs and ecosystems, and explain how your plan treats different groups fairly.
- Transfer challenge: Use the ideas from this course to design a water-security checklist for another setting such as a farm, sports centre, hospital, or neighbourhood.
Evidence of Learning
- Knowledge: You can explain water security, water scarcity, groundwater, pollution, WASH, climate risks, and major water-management solutions using accurate examples.
- Skills: You can interpret evidence, map water systems, compare alternatives, identify trade-offs, ask useful interview questions, and communicate conclusions clearly.
- Products: You can create diagrams, audits, posters, interviews, models, videos, maps, or water-security plans that show how evidence supports your decisions.
- Transfer: You can apply water-security thinking to a new place by considering quantity, quality, access, reliability, ecosystems, hazards, costs, and fairness together.
OERs on the Topic
You can continue learning with the English Wikipedia article on water security. It introduces the concept, risks, measurement approaches, and management strategies.
Linked Learning Areas
Water security connects physical geography, environmental science, health, engineering, citizenship, and sustainable development. The links below help you move between the most important ideas.