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Drinking Water

Community Drinking Water

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. The data included on this site is only for Community Water Systems, and does not include all drinking water systems monitored by the Iowa Department of Natural Resources.

Three types of indicators are used. The public water use measures provide information about the segment of the population to which the measures apply. The level of contaminant shows how well the water systems are producing high-quality water. The potential population exposure measures use estimates of the population served by water supplies to show the potential for exposure to contaminants in drinking water on a population basis. These measures together indicate the potential for public health impacts from contaminant levels of concern.

  • Arsenic in Community Water Systems
  • Disinfection Byproducts in Community Water Systems
  • Nitrates in Community Water Systems
  • Public Water Use

Data and information for this site are still being developed and added.  We welcome your comments and feedback.

This effort is supported by funding from the U.S. Centers for Disease Control and Prevention Environmental Public Health Tracking Program, Cooperative Agreement Number 5U38EH000619-02. The contents of this Website are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention.