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Water Quality Standards: Selenium
EPA and WHO drinking water quality standards — MCLs, MCLGs, WHO guideline values, secondary standards, health effects, and treatment methods for regulated contaminants
| contaminant | CAS number | EPA MCLG mg per L (mg/L) | EPA MCL mg per L (mg/L) | WHO guideline mg per L (mg/L) | contaminant category | health effects | standard | treatment methods |
|---|---|---|---|---|---|---|---|---|
| Selenium | 7782-49-2 | 0.05 | 0.05 | 0.04 | inorganic | Hair and fingernail loss; numbness in fingers or toes; circulatory problems | EPA NPDWR 40 CFR 141; WHO GDWQ 4th Ed. | Ion exchange; reverse osmosis; activated alumina; coagulation/filtration |
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