Drinking water

We need clean water to drink.

It keeps us healthy. You can get it from a tap.

Water can come from rain or rivers. It can also come from deep underground.

Some people get water from machines.

We must treat the water to make it safe. This helps stop people from getting sick. Two billion people do not have safe water. We must work to help them.

Drinking water is water that is safe to drink.

It is also used to make food. Many people get this water from a tap. This is called tap water.

We can find water in many places. It comes from rain, rivers, or glaciers. It also comes from aquifers. These are layers of rock underground that hold water.

Some people even use machines to get water from the air. To be safe, water must go through water treatment. This is a set of steps to clean it.

Water must be clean so people do not get sick. Dirty water can carry tiny germs. These germs can cause diseases like cholera. Some water has too much of a chemical in it. For example, too much fluoride can hurt bones. In some places, arsenic is also in the water. This is a poison that can make people ill. Two billion people lack safe water today. This is a big problem for the world.

Drinking water, also called potable water, is water that is safe for people to swallow.

You can drink it as a liquid or use it to prepare food. Many people get this water through taps in their homes. This is often called tap water.

The amount of water a person needs depends on many things. It changes based on age and how much someone exercises. Environmental conditions like hot weather also matter. People working in hot climates might need a whole day's worth of water.

We find water in many different places around the Earth. It can come from rain, rivers, or even melting glaciers. Some water is found underground in aquifers or hyporheic zones.

People can also use machines to get water from the air using solar power. To make this water safe, it must go through water treatment. This process helps it meet strict quality standards.

One common way to move water is through pipes. This is very efficient, but building these systems costs a lot of money. In some cities, half of the water leaks out of old pipes.

Scientists study water quality using three main categories. These are microbiological, chemical, and physical.

Microbiological testing looks for tiny germs like bacteria, viruses, and parasites. These can cause immediate sickness. Chemical testing looks for things like heavy metals or pesticides. These can cause health problems over a long time. Physical testing looks at things like taste and how clear the water is.

History shows us why clean water is so important. In 1854, a man named John Snow found a cholera outbreak in London. He discovered it came from a single water pump on Broad Street.

This helped start the science of epidemiology, which is the study of how diseases spread. There have been many other water problems in history. In 2000, seven people died from an E. coli outbreak in Walkwalk, Ontario. In 2014, the city of Flint, Michigan, had a crisis with lead in the water.

Unsafe water is a major cause of illness and death worldwide. About two billion people do not have access to safe drinking water.

This is a big challenge for developing countries. Some water has natural chemicals that can be harmful. For example, too much fluoride from rocks can cause bone deformities in children. Arsenic in groundwater is also a threat to many people.

Keeping water clean is a basic human right for everyone.

Drinking water, also known as potable water, is water that is safe for human ingestion.

This includes water drunk directly as a liquid or used indirectly during food preparation. Because it is vital for life, the World Health Organization considers access to safe drinking water a basic human right. However, the amount of water a person needs to stay healthy is not a single fixed number. It depends on several factors like age, physical activity, and health issues. Environmental conditions also play a role, as people working in hot climates may require up to a day's worth of water to stay hydrated.

Humans obtain water from many different natural sources. Common sources include springs, which are often used for bottled water. People also collect rainwater or use surface water from rivers, streams, and glaciers. Groundwater can be found in aquifers or hyporheic zones. Another method involves desalination, which is the process of removing salt from seawater. Scientists are even testing experimental methods like solar-powered atmospheric water generators. For any of these sources to be safe, they must undergo water treatment to meet specific quality standards.

Once water is treated, it must be moved to where people live. The most efficient and convenient way to transport potable water is through a system of pipes. This type of domestic water system delivers water directly to a tap or spigot. Building and maintaining this plumbing infrastructure requires significant capital investment. Some systems also suffer from very high operating costs. In many industrialized countries, replacing old and deteriorating infrastructure could cost as much as $200 billion every year.

Leakage is another major problem, as it reduces access to water. In some urban systems, leakage rates of 50% are not uncommon.

To ensure water is safe, scientists monitor three main categories of parameters: microbiological, chemical, and physical. Microbiological parameters involve tiny living things like bacteria, viruses, and protozoan parasites. For example, E. coli is a coliform bacteria that serves as a marker for sewage contamination. These microbial pathogens are a major concern because they pose immediate health risks. Chemical parameters include things like heavy metals, pesticides, and nitrates. These often pose a chronic health risk through buildup in the body. Physical parameters, such as turbidity or cloudiness, affect the taste and appearance of the water.

Some chemical contaminants are particularly complex. Perfluorinated alkylated substances, or PFAS, are a group of synthetic compounds used in many consumer products. These are known as persistent organic pollutants because they stay in the environment for a long time. PFAS have been detected in the blood of humans and animals worldwide. Scientists are still researching the full extent of how PFAS affects human health. Another natural chemical risk is fluoride. While small amounts help dental health, excessive fluoride from granite rocks can cause bone deformities in children. Arsenic in groundwater is also a global threat, affecting 140 million people in 70 countries.

The history of water science is marked by many important discoveries. In 1854, John Snow identified a cholera outbreak in London's Soho district. He traced the illness back to a single contaminated water pump on Broad Street. This event helped found the science of epidemiology, which is the study of how diseases spread. Many modern crises also highlight the dangers of poor water quality. In 2000, an E. coli outbreak in Walkerton, Ontario, resulted in seven deaths. In 2014, the Flint water crisis in Michigan involved lead and Legionella contamination. These events show why strict water quality standards are necessary.

The global impact of unsafe water is significant and devastating. As of recent reports, as many as two billion people lack safe drinking water. Contaminated water is a major cause of death and illness worldwide, often linked to diseases like cholera, dysentery, and typhoid. In 2010, the former UN Secretary-General Ban Ki-moon noted that more people die from unsafe water than from war. In many developing countries, water issues are closely tied to sanitation and hygiene. This connection is often studied using the acronym WASH, which stands for water, sanitation, and hygiene. Improving these systems is essential to reducing the global burden of disease.