Water on Tap

Water System Requirements

Most public water systems deliver high quality drinking water that meets stringent federal and state standards to millions of Americans every day. Systems are required to test regularly for 87 contaminants (from Atrazine to Zinc) to make sure that no contaminant is present at levels, which may pose a risk to human health.


Drinking water suppliers now provide reports (usually called consumer confidence reports) that tell consumers where their drinking water comes from, what contaminants may be in it, and how they can protect it.

Safe Drinking Water Act (SDWA)

The Safe Drinking Water Act (SDWA), which celebrated its 25th anniversary in 1999, is the main federal law that ensures the quality of Americans' drinking water. Under SDWA, EPA sets standards for drinking water quality and oversees the states, localities, and water suppliers who implement those standards.

Public Water System Supervision (PWSS) Program

The public drinking water systems regulated by EPA provides drinking water to 90% of Americans. Through the Public Water System Supervision (PWSS) program, Environmental Protection Agency (EPA) implements and enforces drinking water standards to protect public health. EPA does not regulate drinking water wells that supply water to fewer than 25 people.

EPA Database

View information about your drinking water in EPA's database.