Clean Water and Sanitation

Introduction

Clean water and safe sanitation help people stay healthy, learn, work, and care for their communities. In this aiMOOC, you will explore where drinking water comes from, how water can become polluted, how water is treated, why toilets and handwashing matter, and how everyone can help protect water.

The United Nations includes these ideas in Sustainable Development Goal 6, often called SDG 6: Clean Water and Sanitation. Its goal is to improve access to safe water, sanitation, and hygiene and to manage water resources responsibly.

As you learn, remember an important safety rule: water that looks clear is not always safe to drink. Never drink water from an experiment, stream, puddle, tank, or unknown source unless a responsible adult and local guidance say it is safe.

Water Is Essential

Your body needs water every day. People also need water for cooking, washing, farming, hospitals, schools, factories, and many other activities. Plants and animals depend on freshwater too.

Only part of Earth's water is freshwater, and not all freshwater is easy for people to reach or safe to use. That is why protecting rivers, lakes, wetlands, groundwater, and water systems matters.

The Water Cycle

Water is always moving through the water cycle. The Sun provides energy that helps liquid water change into water vapour through evaporation. Plants release water vapour through transpiration. Higher in the atmosphere, water vapour cools and forms tiny droplets in condensation. Water returns to the ground as precipitation, such as rain or snow. Some water flows across land as runoff, while some soaks into the ground and can become groundwater.

The water cycle moves water around Earth, but it does not automatically make every water source safe for people. Pollution can enter water at many points.

Safe Drinking Water

Safe drinking water is water that is suitable for drinking and does not expose people to harmful levels of germs or chemicals. Water can contain visible dirt, but it can also contain things you cannot easily see, such as tiny germs or dissolved chemicals.

A safe water system usually includes several connected steps: protecting the water source, collecting or pumping water, treating it when needed, storing it safely, and delivering it through clean pipes, taps, tanks, or other systems.

How Water Is Treated

Water treatment depends on the water source and local system. A drinking-water treatment plant may use several steps. Larger particles can be gathered together and allowed to settle. Water may then pass through filters made from materials such as sand, gravel, or other media. A disinfection step can reduce harmful germs before treated water is stored and sent to users.

Filtration is not the same as complete purification. A classroom sand-and-gravel filter can show how particles may be removed, but the filtered water must not be tasted or drunk. Making water safe may require additional treatment and careful testing.

Protecting Water Sources

It is often easier and safer to prevent pollution than to remove it later. Communities can protect water by keeping rubbish, fuel, paint, oil, medicines, sewage, animal waste, and harmful chemicals away from drains, rivers, lakes, wells, and groundwater.

Plants and soil can also help slow rainwater and reduce erosion. Healthy wetlands can store water, trap some sediments, and provide habitats for wildlife.

Sanitation

Sanitation means safely managing human waste and wastewater so that people and the environment are protected. Good sanitation includes toilets, safe waste collection, drainage, treatment, maintenance, and safe disposal or reuse where appropriate.

A toilet is only one part of a sanitation system. Waste must also be kept away from hands, food, drinking water, homes, and places where children play.

Safe and Inclusive Toilets

School toilets should be clean, private, usable, and safe. They should have nearby handwashing facilities with water and soap. Good design also considers people with disabilities. Features such as ramps, handrails, suitable door widths, and enough space can make facilities easier for more people to use independently.

Sanitation is also connected with dignity and education. When students have safe, private, and usable facilities at school, it is easier to take part in school life comfortably.

Hygiene and Handwashing

Hygiene means habits and conditions that help people stay clean and healthy. Handwashing with soap and water is especially important after using the toilet, before preparing or eating food, and when hands are visibly dirty.

Soap helps loosen dirt, oils, and germs from the skin so they can be rinsed away with water. Careful handwashing includes rubbing the palms, backs of hands, between fingers, thumbs, fingertips, and wrists.

A tippy tap is a simple handwashing device that can release a small amount of water when a container is tipped. It shows that useful hygiene solutions can be designed for places where a normal sink or tap is not available.

Water Pollution

Water pollution happens when harmful substances or too much waste enter water. Pollution can come from many places. Examples include litter, untreated sewage, leaking oil, farm chemicals, industrial waste, and soil washed from bare ground.

Pollution can harm people, animals, plants, and entire ecosystems. It can also make water more difficult and expensive to treat.

A useful way to think about pollution is to ask three questions: Where did it come from? How did it reach the water? What action could prevent it?

Wastewater

Wastewater is water that has already been used. Water from toilets, sinks, showers, kitchens, schools, farms, and some workplaces may become wastewater. Before wastewater returns to the environment, it often needs treatment to remove solids, reduce harmful germs, and lower the amount of pollutants.

Wastewater treatment and drinking-water treatment are different processes, even though both protect health and water quality.

Saving Water and Using It Wisely

Water conservation means using water carefully and avoiding unnecessary waste. You can help by turning off taps when they are not needed, reporting leaks, using only the water you need, and reusing water safely when local rules allow it.

Saving water does not mean using too little water for drinking or hygiene. Health and cleanliness still come first. The aim is to reduce waste while meeting real needs.

Climate, rainfall, drought, population, pipes, pumps, treatment systems, and pollution can all affect how much safe water is available in a place. Because communities face different conditions, there is no single solution that works everywhere.

Fair Access to Water and Sanitation

Clean water and sanitation are not only science topics. They are also connected to fairness, public health, education, engineering, geography, and community planning.

Some people must travel farther for water, use less reliable services, or face barriers because facilities are not accessible. Good solutions listen to the people who will use them and consider children, older people, people with disabilities, and different local needs.

What Communities Can Do

Communities can improve water and sanitation by protecting water sources, repairing pipes, building and maintaining safe toilets, treating drinking water and wastewater, supporting handwashing, testing water quality, planning for droughts and floods, and teaching safe hygiene practices.

Engineers, health workers, teachers, scientists, plumbers, local leaders, families, and students can all contribute. You do not need to solve every problem yourself. Learning how systems work and taking responsible action are important first steps.

Interactive Tasks

Quiz: Test Your Knowledge

What is the main idea of Sustainable Development Goal 6? (Safe water and sanitation for all) (!More roads in every country) (!More computers in every school) (!More airports in every city)

What does sanitation mainly help manage safely? (Human waste and wastewater) (!Sunlight and clouds) (!Books and pencils) (!Road signs and traffic)

Why is soap useful when washing hands? (It helps remove dirt oils and germs) (!It turns water into medicine) (!It makes hands waterproof) (!It replaces the need for water)

What does filtration usually do during water treatment? (It removes particles from water) (!It creates new water) (!It makes all chemicals disappear) (!It changes water into ice)

Which action can help prevent water pollution? (Keeping chemicals away from drains) (!Pouring oil into a sink) (!Dropping litter near a river) (!Washing paint into a storm drain)

What happens during condensation in the water cycle? (Water vapour cools into droplets) (!Rainwater becomes plastic) (!Groundwater turns into soil) (!Rivers stop moving)

What is a tippy tap used for? (Handwashing with a small amount of water) (!Measuring wind speed) (!Heating drinking water) (!Testing soil colour)

Which feature can make a school toilet more accessible? (A ramp and handrails) (!A locked entrance) (!A higher step) (!A narrower doorway)

Which action saves water without reducing hygiene? (Turning off a tap while brushing teeth) (!Skipping handwashing after the toilet) (!Drinking less water than you need) (!Leaving a leak unrepaired)

What should you do with water from a classroom filter experiment? (Do not drink it) (!Taste it to check it) (!Share it as drinking water) (!Store it in a drinking bottle)

Memory Game

Potable	Safe to drink
Sanitation	Safe management of human waste and wastewater
Hygiene	Habits and conditions that support cleanliness and health
Filtration	Passing water through material to remove particles
Wastewater	Water that has already been used
Groundwater	Water stored below the ground

Drag and Drop

Match the correct terms.	Topic
Source protection	Keep rubbish and chemicals away from water supplies
Handwashing	Use soap and water to clean hands
Filtration	Remove particles by passing water through filter material
Sanitation	Manage toilets human waste and wastewater safely
Conservation	Reduce unnecessary water waste

Match each action with the idea it supports.

Crossword Puzzle

Potable	What word means safe to drink
Hygiene	What word describes habits that help keep people clean and healthy
Sanitation	What system safely manages human waste and wastewater
Filtration	What process removes particles by passing water through a filter
Aquifer	What underground layer can store and carry groundwater
Runoff	What water flows over land after rain or melting snow

LearningApps

Cloze Text

Open-Ended Tasks

Easy

Water diary: Track when you use water during one day, then create a simple poster showing three ways you could avoid wasting water without reducing drinking or hygiene.
Handwashing poster: Design an illustrated school poster that shows when and how to wash hands with soap and water.
Water pollution map: Draw a map of an imaginary neighbourhood and mark places where pollution could enter a stream, then add one prevention idea for each place.
Photo story about water: Create a six-image photo story or drawing sequence showing how clean water moves from a source to a user and then becomes wastewater.

Standard

School water audit: With a teacher, inspect taps and visible pipes at school, record possible leaks or waste, and present practical improvement ideas.
Interview about sanitation: Interview a family member, caretaker, plumber, teacher, or community worker about how water and sanitation systems are maintained, then summarize what you learned.
Filter model experiment: Build a supervised sand-and-gravel filter model with dirty non-drinking water, compare the water before and after filtering, and explain why the result must not be drunk.
Water cycle video: Produce a short video that uses labels or acting to explain evaporation, condensation, precipitation, runoff, and groundwater.

Advanced

Accessible sanitation design: Design a model school toilet and handwashing area that considers privacy, safety, water supply, soap, drainage, ramps, handrails, and enough space for different users.
Local water investigation: Visit a safe public location such as a riverbank, treatment facility, water museum, or environmental centre with an adult or school group and create a field report about water protection.
Community WASH campaign: Plan a small awareness campaign for your class that connects water, sanitation, and hygiene, including a message, visual design, target audience, and way to measure whether people learned something.
Water solutions comparison: Research two different ways communities can improve safe water or sanitation, compare their benefits and limits, and recommend which solution would fit two contrasting local situations.

Learning Assessment

Source to tap explanation: Explain how protecting a water source, treating water, storing it safely, and maintaining pipes work together to protect drinking water.
Pollution pathway analysis: Choose one possible pollutant and trace how it could travel from its source into a river or groundwater, then suggest two prevention actions.
Sanitation system reasoning: Explain why building a toilet without safe waste management and handwashing may not solve the full sanitation problem.
Filter evidence task: Use observations from a filter model to explain what filtration can show and what it cannot prove about drinking-water safety.
Inclusive design challenge: Evaluate a school washroom plan and recommend changes that would make it safer and easier to use for more people.
Water conservation decision: Compare several water-saving ideas and justify which ones reduce waste while still protecting health and hygiene.

Evidence of Learning

Knowledge: You can explain key ideas including safe drinking water, sanitation, hygiene, wastewater, pollution, treatment, the water cycle, and conservation.
Skills: You can observe systems, ask useful questions, compare solutions, interpret cause and effect, communicate findings, and use safety rules during investigations.
Products: You can create posters, diagrams, reports, models, interviews, videos, maps, or design proposals that accurately explain water and sanitation ideas.
Transfer: You can apply what you learned to a new school, home, or community situation and suggest realistic actions that protect health, accessibility, and water resources.

Reliable Sources and Further Reading

You can continue learning from these reliable sources:

United Nations Sustainable Development Goal 6: Official information about Goal 6.
UNICEF Water Sanitation and Hygiene: Information about WASH and children's needs.
World Health Organization Drinking-water: Background on safe drinking water and health.
NOAA Water Cycle Resources: Educational material about freshwater and the water cycle.
Wikimedia Commons: Source of the freely licensed images used in this aiMOOC.

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