WELD CTY. BOARD OF COMMISSIONERS v. RYAN

Supreme Court Case No. 22SC242.

536 P.3d 1254 (2023)

2023 CO 54

WELD COUNTY COLORADO BOARD OF COUNTY COMMISSIONERS, Petitioner, v. Jill Hunsaker RYAN, in her official capacity as the Executive Director of the Department of Public Health and Environment for the State of Colorado; Colorado Department of Public Health and Environment; and Colorado Air Quality Control Commission, an agency of the State of Colorado, Respondents.

Supreme Court of Colorado.

October 16, 2023.


Attorney(s) appearing for the Case

Attorneys for Petitioner: Polsinelli PC, Colin C. Deihl , Bennett L. Cohen , Gina L. Tincher , Denver, Colorado.

Attorneys for Respondents: Philip J. Weiser , Attorney General, Michael C. Landis , Assistant Attorney General, Robyn L. Wille , Second Assistant Attorney General Denver, Colorado.

Attorneys for Amicus Curiae Colorado Counties, Inc.: Hall & Evans, L.L.C., Andrew D. Ringel , Denver, Colorado.

Attorneys for Amici Curiae Colorado Department of Human Services and Colorado Department of Early Childhood: Philip J. Weiser , Attorney General, Matthew J. Worthington , Assistant Attorney General, Denver, Colorado.

JUSTICE HART delivered the Opinion of the Court, in which CHIEF JUSTICE BOATRIGHT, JUSTICE MÁRQUEZ, JUSTICE HOOD, JUSTICE GABRIEL, JUSTICE SAMOUR, and JUSTICE BERKENKOTTER joined.


¶1 The Weld County Colorado Board of County Commissioners ("Weld County") seeks judicial review of rules adopted by the Colorado Air Quality Control Commission (the "Commission") to minimize emissions of certain pollutants from oil and gas wells. A division of our court of appeals applied a specialized...

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