Mercury in Drinking Water

EPA Limit: 0.002 mg/L

The EPA maximum contaminant level for mercury is 0.002 mg/L (2 parts per billion).

Where Does Mercury Come From?

Mercury can enter water supplies from natural mineral deposits, industrial discharges, and atmospheric deposition from coal-burning power plants. It can also leach from landfills and agricultural runoff.

Health Risks

Inorganic mercury in drinking water can cause kidney damage. Long-term exposure may affect the nervous system. Organic mercury (methylmercury, primarily a concern in fish) can cause neurological damage, particularly in developing fetuses and young children.

What Should I Do?

Reverse osmosis and distillation can remove mercury. Granular activated carbon filters may also be effective. Contact your water provider for current test results.