Current Regulations: The Oxygenated Gasoline Program was revised in 2000. See Colorado Air Quality Control Commission Regulation No. 13. The control period was Nov. 1 - Feb. 7. Effective Nov. 1, 2004, the end of the control period is Jan. 31 for all areas.

Larimer-Greeley required min. 2.0 wt% oxygen content Nov. 1 - 7 and min. 2.7 wt% oxygen content from Nov. 8 to the end of the control period. On July 18, 2002, Colorado adopted changes that removed Larimer County effective January 1, 2004. On December 19, 2002, Colorado adopted revisions that removed Weld County effective January 1, 2004.

Denver-Boulder program:

Effective Nov. 1 - 7 Nov. 8 - Jan. 31 Feb. 1 - 7
11/1/2002 min 2.0 wt% min 2.6 wt% min 1.5 wt%
11/1/2003 min 2.0 wt% min 2.0 wt% min 1.5 wt%
11/1/2004 min 1.9 wt% min 1.9 wt% no program
11/1/2005 min 1.5 wt% min 1.5 wt% no program

Effective 2/1/11, Regulation No. 13 will be repealed (adopted 8/20/09).

Signed by the Governor on May 23, 2000, SB00-190 bans MTBE effective on September 1, 2000; if a person sold gasoline with MTBE on March 1, 2000, it shall be phased out by April 30, 2002 (See Colorado Revised Statutes 25-7-139). On January 11, 2001, Colorado modified its wintertime oxygenated gasoline program to eliminate any mention of MTBE and revised its clean fuel fleet program to remove MTBE as an approved fuel.

The Colorado Department of Labor and Employment, Division of Oil and Public Safety, uses current ASTM standards and methods to analyze all petroleum products. Colorado Petroleum Storage Tank Statutes section 8-20-204 specifically mentions ASTM D 4814 for gasoline.

In a memo dated December 15, 2004, the Director of the Division of Oil and Public Safety in the CO Department of Labor and Employment announced that CO will not enforce the ASTM diesel lubricity standard prior to July 1, 2005 at refineries, importers, pipelines, and terminals. Beginning August 1, 2005, the ASTM diesel lubricity requirement will be enforced at all locations.

Summer Federal Phase II RVP: Instead of enforcing max. 7.8 psi RVP for Denver/Boulder, EPA has granted enforcement discretion to apply 9.0 psi RVP for many years. However, EPA announced in a letter dated March 25, 2004 that it will not waive this standard and 7.8 psi RVP gasoline will be required for Denver/Boulder during the 2004 summer (and presumably later summers).

In the Early Action Compact, Ozone Action Plan approved by the Colorado Air Quality Control Commission on March 12, 2004 (see page II-1), CO requested a three year waiver establishing an 8.1 psi RVP standard for the existing Denver metropolitan 1-hour ozone attainment/maintenance area through the 2007 summer ozone season. This was not approved by EPA.

Voluntary: From 1999 to 2003, the Denver metropolitan area had a voluntary max. ~ 8.5 psi RVP summer gasoline program.

Legislature: Introduced in January 2006, SB 06-138 would require that all gasoline contain at least 5 vol% denatured ethanol as of 1/1/07, 10 vol% denatured ethanol as of 1/1/09, and higher ethanol concentrations later if allowed by federal law and if it would not void any automobile manufacturer's warranty. It was amended, passed by the House and Senate in May 2006, and vetoed by the Governor on May 26, 2006.

SB 07-147, introduced in January 2007, would require at least 75% of gasoline sold from November through April contain at least 10 vol% alternative fuel that is combined with gasoline and is made substantially from non-petroleum products, effective 1/1/08.

Introduced in March 2007, SB 07-238 would require at least 2 vol% biodiesel (not including palm oil) or renewable diesel in diesel 90 days after notice that annualized production of biodiesel in Colorado from Colorado sources reached 5 million gallons, increasing to at least 5 vol% biodiesel or renewable diesel when production in Colorado from Colorado sources reaches 15 million gallons (railroads, marine and home heating oil would be exempt), and at least 10 vol% ethanol in gasoline 90 days after notice that the capacity of ethanol production in Colorado reached 15 million gallons.

Last updated August 2010