What's in Your Water?
- Health Guidelines are established by EWG to protect public health. They are based on the latest science, data, and research on water pollution.
- Health Guidelines tend to be more stringent than federal legal limits, as the vast majority of legal limits have not been updated in decades.
- Legal limits do not exist for hundreds of dangerous contaminants that have been detected in public water supplies and proven to pose health risks.
This database gives you a complete and transparent assessment of your water quality based on test results from your local water supplier. All public water systems must abide by federal regulations—also known as legal limits—set and monitored by the U.S. Environmental Protection Agency (EPA). However, the vast majority of legal limits have not been updated in decades and hundreds of dangerous contaminants remain unregulated today. That’s why we’ve also provided EWG Health Guidelines, which are based on the latest science, data, and research on water pollution. Keep scrolling for more details about the contaminants detected in your water supply and how to best protect yourself and your family.
Includes chemicals detected in 2015-2017 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015 (and subsequent testing when available), for which annual utility averages exceeded a health guideline established by a federal or state public health authority.
† HAA5 is a contaminant group that includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. TTHM is a contaminant group that includes bromodichloromethane, bromoform, chloroform and dibromochloromethane.