Drinking water

Drinking water

Any water that is suitable for drinking or otherwise human internal combustion such as cooking or food preparation.

What is drinking water?

The drinking water that is supplied to our homes comes from either a surface water or ground water source. Surface water collects in streams, rivers, lakes, and reservoirs. Ground water is water located below the ground where it collects in pores and spaces within rocks and in underground aquifers. We get ground water by drilling wells and pumping it to the surface. Water travels to your tap from a surface water or ground water source through your local water utility or through an individual water system, such as a private well. A private well uses ground water as its water source. Owners of private wells and other individual water systems are responsible for ensuring that their water is safe from contaminants.

Water quality

Contaminants in our water can lead to health issues, including gastrointestinal illness, reproductive problems, and neurological disorders. Infants, young children, pregnant women, the elderly, and people with weakened immune systems may be at increased risk for becoming sick after drinking contaminated water. For example, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Federal law requires that systems reduce certain contaminants to set levels in order to protect human health.

Safety

EPA is responsible for making sure that public water supplies within the United States are safe. In 1974, Congress passed the Safe Drinking Water Actexternal icon. This law sought to protect the nation’s public drinking water supply by giving EPA authority to set the standardsexternal icon for drinking water quality and oversee the states, localities, and water suppliers who implement those standards. In 1986 and 1996, the law was amended to protect drinking water and its sources, which include rivers, lakes, reservoirs, springs, and ground water wells.

Sources of contamination

There can be many sources of contamination of our water systems. The most common sources of contaminants include:

Naturally occurring chemicals and minerals (e.g., arsenic, radon, uranium) Local land use practices (e.g., fertilizers, pesticides, livestock, concentrated animal feeding operations) Manufacturing processes Sewer overflows Malfunctioning wastewater treatment systems (e.g., nearby septic systems) EPA regulates many contaminants that pose known human health risks. EPA makes sure that water meets certain standards, so you can be sure that high levels of contaminants are not in your water.

Filtering water

Different water filters have different functions. Some can make your water taste better, while others can remove harmful chemicals or germs. Visit CDC’s filter page to learn more about home water filters.

Cryptosporidium and drinking water

The parasite Cryptosporidium can survive a long time, even after the water is treated with chlorine or iodine. Cryptosporidium can be removed from water by filtering through a reverse osmosis filter, an “absolute one micron” filter, or a filter certified to remove Cryptosporidium under NSF International Standard #53 for either “cyst removal” or “cyst reduction.” Filtering does not remove bacteria and viruses. Ultraviolet light treatment of water is not effective against Cryptosporidium at normally used levels.

Water Testing

Every community water supplier must provide an annual report to its customers, known as a Consumer Confidence Report (CCR). The report provides information on your local drinking water quality, including the water’s source, contaminants found in the water, and how consumers can get involved in protecting drinking water. According to EPA, there are three basic types of private drinking wellsexternal icon: dug, drilled, and driven. Proper well construction and continued maintenance are critical to the safety of your water supply. It is important to know what type of well you have. Well type affects how likely your water is to become contaminated and what kind of maintenance procedures you should follow. You may be able to determine the type of well you have by looking at the outer casing and cover of the well.

As a private well owner, should I have my well tested?

Yes, as a private well owner, you are responsible for testing your well to ensure the water is safe to drink. EPA is responsible for making sure that the public water supply within the United States is safe. However, EPA does not monitor or treat private well drinking water. For information on testing your well water, visit Drinking Water’s Well Testing page.

What germs and chemicals should I test for in my well?

Several water quality indicators (WQIs) and contaminants that should be tested for in your water are listed below. A WQI test is a test that measures the presence and amount of certain germs in water. In most cases, WQIs do not cause sickness; however, they are easy to test for and their presence may indicate the presence of sewage and other disease-causing germs from human and/or animal feces (poop). For more information on these contaminants and WQIs, please see the Drinking Water’s Well Testing page.

Water Quality Indicators:

• Total Coliforms
• Fecal Coliforms / Escherichia coli (E. coli)
• pH

Contaminants:

• Nitrate
• Volatile Organic Compounds (VOCs)

Other germs or harmful chemicals that you should test for will depend on where your well is located on your property, which state you live in, and whether you live in an urban or rural area. These tests could include testing for lead, arsenic, mercury, radium, atrazine, and other pesticides. You should check with your local health or environmental department to find out if any of these contaminants are a problem in your region.

Drinking water Resources
Need Help Finding a Doctor? Need help finding a doctor or specialist anywhere in the world? Explore our world directory. WikiMD's DocFinder can assist you in locating millions of physicians.	Medical Knowledge Access the latest research - Most recent articles Ongoing trials.

Translate to: East Asian 中文, 日本, 한국어, South Asian हिन्दी, Urdu, বাংলা, తెలుగు, தமிழ், ಕನ್ನಡ,
Southeast Asian Indonesian, Vietnamese, Thai, မြန်မာဘာသာ, European español, Deutsch, français, русский, português do Brasil, Italian, polski