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Water: Water Quality Standards Academy

Basic Course: Supplemental Topics (NPDES Permit 12)

NPDES Permit Program

« Page 12 of 20 »

Establishing WQBELs: Step 2—Characterize the Effluent & Receiving Water

This next step in assessing the need for water quality-based effluent limits involves a sequence of four tasks, which are listed below and described in the pages that follow:

  • Identify pollutants of concern in the effluent.
  • Establish whether dilution/mixing of effluent in receiving waters is allowed by the State/Tribe’s water quality standards.
  • Identify critical conditions for effluent and receiving water modeling.
  • Establish the appropriate dilution allowance or mixing zone for each pollutant of concern.

For informational purposes only–Not official statements of EPA policy.

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