Metals
Selenium
What it is
A naturally occurring element. In small amounts it is a nutrient; it also comes from petroleum and metal refining and mining.
Your body
According to EPA, long-term exposure well above the federal limit has been linked to hair or fingernail loss, numbness in fingers or toes, and circulatory problems.
Your home
Selenium at drinking-water levels does not usually affect plumbing.
Federal standard: MCL 50 ppb (EPA)
Treatment options that can reduce it
Research & sources (2)
Maryland water systems that reported selenium
- Town of St. MichaelsTalbot · 2025 data
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
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