Well Water Testing

In Maine, more than half of all homes rely on private wells for drinking water. Many wells have levels of naturally occurring chemicals such as arsenic, radon, uranium, or other chemicals that can cause serious health effects such as cancer or low birth weight. These contaminants can only be detected through laboratory testing. Private well owners are responsible for testing their own water and correcting any problems.

Study of Arsenic in Well Water Answers Important Questions about Bathing and Treatment

Showering and taking a bath in well water high in arsenic are not significant arsenic exposure sources for children and adults, according to a new study by the Maine CDC and US CDC.

This is good news for the tens of thousands of Maine residents who likely have too much arsenic in their well water. Bathing in contaminated well water is one of the top concerns voiced by the more than 700 Mainers who seek well water advice from Maine CDC experts each year.

2016 Lyme Disease Data Published

Updated May 2018: Read the 2018 tickborne content update for new information on Lyme disease, anaplasmosis, and babesiosis data.


After a major release of data last week, local data about Lyme disease and deer ticks are now publicly available through the Maine Tracking Network’s interactive data portal. The Maine CDC made the town-level data available in response to increasing requests from municipalities, local organizations and residents trying to make informed decisions about Lyme disease prevention strategies.

Maine CDC Video Helps with Well Water Testing

In April, 2014, the Maine Center for Disease Control and Prevention (CDC) published a how-to video to clarify the procedures of a water test for people who rely on a private, domestic well for drinking water.

Available on YouTube, and on DVD by request, the 3-minute video shows all the steps involved in a water test and emphasizes the most important things private well owners should know when testing their well water. 

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