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EPA's selenium revision heads into murky waters.

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Journal of Environmental Monitoring : JEM

|September 1, 2001

Summary

The US EPA is revising selenium water quality standards. New research highlights selenium

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Area of Science:

Environmental Science
Chemistry
Toxicology

Background:

The US Environmental Protection Agency (EPA) is currently revising its water quality standards for selenium.
There is a scientific debate regarding the prevalence and impact of selenium contamination.
Government scientists advocate for stricter standards due to widespread contamination, while industry scientists view it as an environmental anomaly.

Purpose of the Study:

To inform the EPA's revision of selenium water quality standards.
To address the ongoing debate on selenium contamination levels and impacts.
To incorporate emerging scientific understanding of selenium's complex geochemistry into standard-setting.

Main Methods:

Review of existing scientific literature on selenium contamination.
Analysis of geochemical data related to selenium.
Assessment of the toxicological effects of selenium on aquatic and avian species.

Main Results:

Selenium contamination is more widespread than previously assumed by some stakeholders.
Fish, crustaceans, and birds exhibit unique sensitivity to increased environmental selenium concentrations.
Selenium's complex geochemistry presents challenges for accurate risk assessment and standard setting.

Conclusions:

Stricter water quality standards for selenium are likely necessary.
Further research into selenium's geochemical behavior is crucial for effective regulation.
Protecting sensitive aquatic and avian populations requires a comprehensive approach to selenium management.

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