During the 2025 Legislative Session, Utah lawmakers passed HB81 – Fluoride Amendments, which HB81 prohibits the addition of fluoride to public drinking water in Utah starting May 7, 2025.
Continued oversight of fluoride in drinking water
Although public water systems in Utah must stop adding fluoride treatment by May 7, 2025, we will continue to require systems to monitor and report naturally occurring fluoride levels in accordance with the Safe Drinking Water Act requirements.
Fluoride is a mineral commonly found in groundwater, especially in areas with certain types of rock and soil. Even without added treatment, some drinking water may still contain natural levels of fluoride.
We continue monitoring to ensure levels remain safe and to notify the public if fluoride ever exceeds health standards. There are two key limits:
- Primary Maximum Contaminant Level (MCL): 4.0 mg/L
Levels above this may pose long-term health risks, such as bone pain or disease. - Secondary MCL: 2.0 mg/L
Levels above this may cause cosmetic effects like staining or pitting of teeth in children under nine.
How to find naturally occurring fluoride levels in your drinking water
Fluoride may naturally be present in Utah’s groundwater and surface water sources. Our map shows fluoride test results based on testing data submitted by public water systems that monitor for fluoride, and is not recommended for supplemental fluoride dosing. These samples are collected from drinking water sources, and may include data collected prior to the discontinuation of fluoride treatment. People who use private well water will need to find a private company or certified lab to test their water for natural fluoride.
For supplemental dosing purposes, Utahns should call their local public water system for the most recent information on natural fluoride levels in their drinking water. To learn more about supplemental fluoride, visit the Utah Department of Health and Human Services.