EPA legal limit
2 ppm
Maximum Contaminant Level
EWG health guideline
No guideline
Science-based, stricter target
Health effects
Short-term exposure above 2 ppm can cause increases in blood pressure. Long-term exposure at high levels may cause cardiovascular effects. At the levels found in most U.S. drinking water, barium is not a significant health concern.
Where it comes from
Natural geological sources and industrial discharge from drilling operations and smelting.
How it's regulated
EPA MCL of 2 ppm.
How to filter barium
Not all filters address barium. Look for independently certified filters—NSF International certification means the removal claim has been independently verified.
Frequently asked questions
What is barium?
A naturally occurring metal found in rock and soil. Leaches into groundwater from natural deposits and is also present in some industrial discharge.
What are the health effects of barium?
Short-term exposure above 2 ppm can cause increases in blood pressure. Long-term exposure at high levels may cause cardiovascular effects. At the levels found in most U.S. drinking water, barium is not a significant health concern.
Is barium regulated in drinking water?
EPA MCL of 2 ppm.
Where does barium come from?
Natural geological sources and industrial discharge from drilling operations and smelting.
How do I remove barium from tap water?
The most effective methods for removing barium are: Reverse osmosis (RO), NSF 58 certified RO system, Ion exchange resin. Look for NSF-certified systems—independent certification confirms removal claims have been verified.
Is barium in your water?
Enter your ZIP code to see the measured level in your specific utility.