Maine Well Water: Testing for Arsenic, Radon & Uranium

Maine Well Water Characteristics

Approximately 40% of Maine residents rely on private wells, one of the highest percentages in the nation. Maine's granitic bedrock creates unique water quality challenges.

Naturally Occurring Contaminants

Arsenic: Found at elevated levels in many parts of Maine, particularly in southern and central regions. Maine has some of the highest private well arsenic levels in the US. Radon: The granitic bedrock produces elevated radon levels. Uranium: Found in some bedrock wells, especially in granite formations.

Maine CDC Well Water Program

The Maine CDC offers a comprehensive private well water testing program. They recommend testing for bacteria annually and for a full panel of contaminants every 3-5 years or when purchasing property.

Explore Maine well water data on our interactive tool.