Water Quality Standards Guidance

The guidance documents listed below are in PDF format.

Guidance Number Subject Date
04-2021 Guidance for Exceptional State Waters Designations in Antidegradation Policy Section of Virginia Water Quality Standards Regulation (9 VAC 25-260-30.A.3) 11/15/04
WQS-5 Guidance of Application of Public Water Supply Designations 11/4/94
WQS-3 Interpretation of Fecal Coliform Bacteria and Mixing Zones 4/20/93
WQS-2 Water Quality Standards Interpretation of Biologically Based Flows, Low Flow Application and Mixing Zones 11/2/92
WQS-1 New Standards - Interpretations 2/24/92
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Virginia Department of
Environmental Quality
P.O. Box 1105
Richmond, VA 23218
(804) 698-4000


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