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Resources/General Information

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EPA Primary and Secondary Drinking Water Regulations

EPA sets legal limits on over 90 contaminants in drinking water. The legal limit for a contaminant reflects the level that protects human health and that water systems can achieve using the best available technology. EPA rules also set water-testing schedules and methods that water systems must follow.

Ground Water and Drinking Water

Find out more about ground water and drinking water regulations, topics, labs and other water topics.  With this link, you can learn about new proposed laws and any other information from the EPA.


Drinking Water Contaminants

The National Primary Drinking Water Regulations (NPDWR) are legally enforceable primary standards and treatment techniques that apply to public water systems. Primary standards and treatment techniques protect public health by limiting the levels of contaminants in drinking water.

Basic Information about Pathogens and Indicators in Drinking Water

The United States enjoys one of the world's most reliable and safest supplies of drinking water. Congress passed the Safe Drinking Water Act (SDWA) in 1974 to protect public health, including by regulating public water systems. 

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Private Drinking Water Wells

EPA estimates that more than 23 million households rely on private wells for drinking water in the United States (August 2021). EPA does not regulate private wells nor does it provide recommended criteria or standards for individual wells.

Standards & Risk Management

Drinking water and wastewater utilities face threats, from man-made and natural disasters to aging infrastructure. To prepare for the next emergency, you must understand your risks. Start by conducting a risk assessment to find out where your utility stands. 

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