Thallium in Drinking Water

1,836Total Violations
6Health-Based
0Currently Active

EPA Limit: 0.002 mg/L

The EPA maximum contaminant level for thallium is 0.002 mg/L.

Where Does Thallium Come From?

Thallium can leach from ore processing operations, electronics manufacturing, and pharmaceutical production. It also occurs naturally in some mineral deposits.

Health Risks

Exposure above the MCL can cause hair loss, changes in blood chemistry, and kidney, intestine, and liver problems.

What Should I Do?

Activated alumina and ion exchange can remove thallium from drinking water.

States with Most Thallium Violations

StateHealth-Based Violations
New York6