Drinking water quality is an important public health issue because contamination in a single system can expose many people at once. Contaminated water can be a threat to anyone's health, but especially to young children.
About half of our nation's drinking water comes from ground water. Most is supplied through community water systems. But many families rely on private, household wells and use ground water as their source of fresh water.
Drinking water protection programs at the state and national levels play a critical role in ensuring high quality drinking water and in protecting the public's health.
About 90% of people in the United States get their water from a community water system. These public water systems are required to provide drinking water that meets standards established under the Safe Drinking Water Act (SDWA). EPA establishes drinking water standards for individual contaminants and groups of contaminants.
This symbol means you are leaving the CDC.gov Web site. For more information, please see CDC's Exit Notification and Disclaimer policy.
Copyrighted images: Images on this website which are copyrighted were used with permission of the copyright holder and are not in the public domain. CDC has licensed these images for use in the materials provided on this website, and the materials in the form presented on this website may be used without seeking further permission. Any other use of copyrighted images requires permission from the copyright holder.
Tracking Hot Topics
- Consumer's Guide to Radon Reduction
- EPA's Map of Radon Zones
- 28 Days to a Healthier Heart
- Go Red for Women — How to Prevent Heart Disease
- Heart Health and Air Pollution Toolkit
- What You Can Do to Prevent Heart Disease
- Tracking Fellowship Milestone
- View our Tracking Success Stories to learn how Tracking is making a difference across the U.S.