Water is essential for life. People depend on safe water for their health and livelihood. But contaminated water leads to millions of deaths and even more illnesses every year.1
Water pollution is any contamination of water with chemicals or other hazardous substances that are detrimental to human, animal, or plant health.
Possible sources of water contamination are:
- Corroded water pipes that leach harmful chemicals, such as lead
- Hazardous waste sites and industrial discharges
- Pesticides and fertilizers from agricultural operations
- Naturally occurring hazardous chemicals, such as arsenic
- Sewage and food processing waste
Drinking water in the U.S. comes from a variety of sources, including public water systems, private wells, or bottled water. Worldwide, nearly 2 billion people drink contaminated water that could be harmful to their health.2 Though more of a concern in developing countries, safe drinking water is a U.S. public health priority.
Examples follow of potential drinking water contaminants and reported health effects, which can range from subtle to severe depending on the chemical and total exposure.
- Arsenic – a known human carcinogen associated with skin, lung, bladder, kidney, and liver cancer3
- Lead – behavioral and developmental effects in children; and cardiovascular and kidney problems4
- Hydraulic fracturing (fracking) chemicals – damage to the immune5 and reproductive systems6
- Pesticides – neurodevelopmental effects and Parkinson’s disease7
What is NIEHS Doing?
NIEHS research examines potential health effects of contaminants in water and explores ways to protect the public from contact with unsafe water.
The GuLF STUDY (Gulf Long-term Follow-up Study), funded by NIEHS and the National Institutes of Health Common Fund, studies the health of people who helped with the oil spill response and clean-up, took training, signed up to work, or were sent to the Gulf of Mexico to help in some way after the Deepwater Horizon disaster. NIEHS is leading this research effort with the support of many community groups. Nearly 33,000 people joined the study, making it the largest study ever conducted on the health effects of an oil spill. The study has tracked numerous health issues reported by cleanup workers, including skin rashes, wheezing and difficulty breathing, headaches, nausea, depression and anxiety, and heart attacks. However, the most recent publication to emerge from the research suggests that some health effects associated with the spill may resolve over time.
Read about previous and current Gulf Oil Spill Response Efforts.
NIEHS and the National Science Foundation jointly fund research on marine-related health issues through the Centers for Oceans and Human Health. Grantees, for example, develop techniques for more accurate and earlier detection of harmful algal blooms with the goal of preventing and reducing exposure. They also study the health effects of eating seafood containing toxins produced by harmful algal blooms. Contaminants of emerging concern, such as microplastics, are also studied.
NIEHS offers time-sensitive grants that enable researchers to launch studies quickly in response to natural disasters, industrial accidents, or policy changes that affect water quality. In addition, the National Toxicology Program, located at NIEHS, reviews available toxicology studies and conducts short- and long-term studies to help public health officials respond to threats to the safety of drinking water. For example:
- Researchers measured PFAS exposures in residents near Colorado Springs whose water was contaminated with the PFAS perfluorohexane sulfonate (PFHxS), as well as contamination of the Cape Fear River in North Carolina by the PFAS GenX.
- Scientists were able to address the concerns of residents of Flint, Michigan about their exposure to lead, giving them rapid information on how great the risk was and ways they might limit the exposure.
- NTP completed a series of studies on the toxicity of chemicals that spilled into the Elk River in West Virginia, January 2014.
NTP is evaluating individual PFAS (per- and polyfluoroalkyl substances), which is a group of widely produced industrial-use chemicals that are found in some waterways. NTP studies seek to understand the effects of certain PFAS on metabolism, biological activity in cell-based systems, and health effects related to cancer and the immune system.
The NIEHS Superfund Research Program funds grants to study the health effects of potentially hazardous substances and to investigate effective and sustainable ways to clean up those substances at hazardous waste sites, which may include waterways.
The program’s grant recipients have developed online tools to inform local communities about potential environmental health risks.
- At Texas A&M University, scientists created the HGBEnviroScreen. (HGB stands for the eight-county Gulf Coast region of Houston-Galveston-Brazoria.) Residents may use the tool to better understand how health, environmental, and socioeconomic factors can combine to increase their susceptibility to health problems.
- Scientists at University of California, Berkeley launched the Drinking Water Tool, an interactive website that helps California residents identify areas where water quality may be of concern.
SRP-funded researchers developed therapeutic sorbents that can bind to hazardous chemicals in water, potentially reducing health problems following natural disasters, chemical spills, and other emergencies. Sorbents are insoluble materials that may be used to bind and remove contaminants from water or food. In the form of enterosorbents, they can be safely consumed by people as a way to remove certain harmful substances from the gut.
NIEHS supports the NIH Disaster Research Response (DR2) Program. This program includes ready-to-go data collection tools, research protocols, and a network of trained responders. These tools assist timely gathering of environmental and toxicological data that compliments health information collected during disaster responses. Many disasters can affect water safety.
Stories from the Environmental Factor (NIEHS Newsletter)
- Water Contamination on Tribal Lands Focus of Webinar Series (August 2020)
- COVID-19 Shines Light on Navajo Water Contamination (June 2020)
- Environmental Risks Visualized Through New Online Tools (April 2020)
- Microplastics Research Needs Innovation, Health Focus (March 2020)
- Iowa Public Meeting Tackles Water Quality, Farming, Health (August 2019)
- PFAS — A Problem in North Carolina Drinking Water (March 2019)
- Environmental Chemistry Goes High-tech (August 2018)
- Karletta Chief Featured in Science Friday Film (April 2018)
Printable Fact Sheets
- Climate and Human Health (904KB)
- Drinking Water and Your Health (1MB)
- Endocrine Disruptors and Your Health (2MB)
- Microplastic Pollution and Human Health (June 2020)
- Harmful Algal Blooms and Your Health (June 2018)
- A Second Look at the Impacts of Hydraulic Fracturing (November 2014)
- Arsenic Literature Collection – This curated collection of scientific articles, published in the journal Environmental Health Perspectives, reports on the prevalence of arsenic exposure, its toxicity, the complex mechanisms involved, and the implications for society and communities.
- Medline Plus: Drinking Water – Consumer information from Medline Plus, a service of the National Library of Medicine.
- CDC: Drinking Water – Public health information from the Centers for Disease Control and Prevention.
- Environmental Wellness Toolkit – What surrounds you each day in your home, work, or neighborhood and the resources available to you can affect your health. You can’t always choose what’s in the environments you live, work, or play in. But taking small steps to make your environments safer and limiting your exposure to potentially harmful substances can help keep you healthier.
- Ground Water and Drinking Water – Information from the U.S. Environmental Protection Agency.
- Investigating Methods to Improve Drinking Water – NIEHS grant recipient David Sedlak, Ph.D., University of California, Berkeley, has devoted his career to improving drinking water quality. Read about his research efforts and findings.
- PFAS Literature Collection – This curated collection of scientific articles and reviews, published in the journal Environmental Health Perspectives, report on the prevalence and accumulating health effects associated with PFAS exposure.
- Report on Carcinogens – This congressionally mandated, science-based, public health document is prepared by NTP for the HHS Secretary. The current report lists 248 agents, substances, mixtures, and exposure circumstances that are known or reasonably anticipated to cause cancer in humans.
Related Health Topics
- Landrigan P et al. 2018. The Lancet Commission on Pollution and Health. Feb 3;391(10119):462-512 [Abstract Landrigan P et al. 2018. The Lancet Commission on Pollution and Health. Feb 3;391(10119):462-512]
- Progress on Drinking Water, Sanitation, and Hygiene (WHO). (Last accessed March 23, 2020) [Full Text Progress on Drinking Water, Sanitation, and Hygiene (WHO). (Last accessed March 23, 2020)]
- NTP. 2016. Report on Carcinogens, Fourteenth Edition.; Research Triangle Park, NC: U.S. Department of Health and Human Services, Public Health Service. [Abstract NTP. 2016. Report on Carcinogens, Fourteenth Edition.; Research Triangle Park, NC: U.S. Department of Health and Human Services, Public Health Service.]
- Agency for Toxic Substances and Disease Registry. 2007. Toxicological profile for Lead. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service. [Full Text Agency for Toxic Substances and Disease Registry. 2007. Toxicological profile for Lead. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.]
- Boule LA, et al. 2018. Developmental exposure to a mixture of 23 chemicals associated with unconventional oil and gas operations alters the immune system of mice. Toxicol Sci; doi:10.1093/toxsci/kfy066 [Online 01 May 2018]. [Abstract Boule LA, et al. 2018. Developmental exposure to a mixture of 23 chemicals associated with unconventional oil and gas operations alters the immune system of mice. Toxicol Sci; doi:10.1093/toxsci/kfy066 [Online 01 May 2018].]
- Sapouckey SA, et al. 2018. Prenatal exposure to unconventional oil and gas operation chemical mixtures altered mammary gland development in adult female mice. Endocrinology 159(3):1277–1289. [Abstract Sapouckey SA, et al. 2018. Prenatal exposure to unconventional oil and gas operation chemical mixtures altered mammary gland development in adult female mice. Endocrinology 159(3):1277–1289.]
- Pesticides (NIEHS). (Last accessed March 23, 2020) [Full Text Pesticides (NIEHS). (Last accessed March 23, 2020)]