Region 8
Whole Effluent Toxicity (WET)
National Information
Regional Information
- Whole Effluent Toxicity (WET)
- WET Testing Laboratories
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WET Documents
- Region 8 NPDES Programs
Whole Effluent Toxicity refers to the aggregate toxic effect to aquatic organisms from all pollutants contained in a facility's wastewater (effluent). It is one way we implement the Clean Water Act's prohibition of the discharge of toxic pollutants in toxic amounts. WET tests measure wastewater's effects on specific test organisms' ability to survive, grow and reproduce.
In Region 8 all six states have been granted delegation to run the National Pollutant Discharge Elimination System (NPDES) program. WET testing is a component of this program and is used in discharge permits to be protective of the synergistic effects wastewater may have to receiving waters.
If you have questions about WET, contact:
VelRey A. Lozano
EPA Region 8, (8P-W-WW)
1595 Wynkoop Street
Denver, CO 80202-1129
303-312-6128
Email: lozano.velrey@epa.gov