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See national section for basic information and federal regulations.
Comparison: State vs. Federal
• Rules. Colorado requires site-specific water standards when justified by the results of a bioassay or comparable scientific study. State guidelines for developing site-specific aquatic life criteria are comparable to methods established by the U.S. Environmental Protection Agency (EPA).
Like the federal rules, whole effluent toxicity (WET) tests may be incorporated into a facility's Colorado Pollutant Discharge System (CPDS) permit (5 CCR 1002-61.2). The CPDS permit is the state's equivalent to the National Pollutant Discharge Elimination System permit. See the state section NPDES PERMIT for more information.
The state defines "WET" as a biological activity effect by which effluents exhibit antagonism to the aquatic organisms used in biomonitoring tests in the form of acute or chronic toxicity. WET may be caused by a variety of specific compounds or by synergistic interaction among compounds.
• Administration and enforcement. CDPHE's Water Quality Control Division is responsible for establishing monitoring requirements as part of the permit and for enforcing compliance with ...