The Environmental Protection Agency (EPA) requires all public water systems to report annually on levels of certain known contaminants in its drinking water. Additionally, the EPA also requires public utilities to test unregulated contaminants every five years. This testing, known as the fifth Unregulated Contaminant Monitoring Rule (UCMR5), helps the EPA collect data on the presence of certain substances in drinking water to make informed decisions about future regulations and public health protections. Current and past results are listed below.