The majority of Americans are provided high-quality drinking water. About 90% of people in the United States get their water from a community water system. The U.S. Environmental Protection Agency (EPA) sets regulations for treating and monitoring drinking water delivered by community water systems. Water quality standards and monitoring requirements are in place for more than 90 contaminants.
About 10% of people in the United States rely on smaller water supplies (mostly household wells) that are not regulated by EPA. Treatment and monitoring requirements for these small systems vary from state to state. 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.
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
- Emergency Preparedness and Response: Carbon Monoxide Poisoning After a Disaster
- Carbon Monoxide Toolkit
- CDC's Carbon Monoxide Poisoning Prevention
- Carbon Monoxide Communication Tools
- Tracking Fellowship Milestone
- View our Tracking Success Stories to learn how Tracking is making a difference across the U.S.