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The Department of Environmental Quality has revised Water Quality Rules, Chapter 1, Wyoming Surface Water Quality Standards; and Chapter 2, Permit Regulations for Discharges to Wyoming Surface Waters.
Chapter 1 has been revised to (1) fulfill the federal requirements at 40 CFR § 131.20, (2) restructure and align requirements with state law and federal law, regulations, and guidance; (3) revise designated uses and remove the designated use classification system; and (4) provide minor updates to specific water quality criteria. Chapter 2 has been revised to (1) update references to the designated use classification system to reflect proposed revisions to Chapter 1; and (2) incorporate provisions related to fish toxicants, aquatic pesticides, and short-term sediment disturbance that Water Quality Division proposed to move from Chapter 1 to Chapter 2.
The Environmental Quality Council adopted the revised rules at a public hearing held on June 11, 2025, in the City Council Chambers, 55 Grinnell Plaza, Sheridan, WY, 82801. The final rule was filed with the Wyoming Secretary of State on August 6, 2025.
Electronic copies of the rule are available from the Secretary of State at rules.wyo.gov, under “Current,” “Rules,” “Environmental Quality, Dept of (020),” “Water Quality,” and “Chapter 1” or “Chapter 2.”
If you have any questions concerning this rule adoption, please contact Gina Thompson at 307-777-7343 or [email protected].
Para español, visite deq.wyoming.gov. Americans with Disabilities Act: special assistance or alternative formats will be made available upon request for individuals with disabilities. Please provide at least fourteen (14) days before the close of the public comment period for such requests.
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