Current Regulations: After opt-out of federal RFG in the summer of 1998, Phoenix area required summer max. 7.0 psi RVP gasoline, winter max. 9.0 psi RVP gasoline and CARB Phase 2 RFG or federal Phase I RFG. In the winter, Phoenix also required min. 10 vol% ethanol or min. 2.7 wt% oxygen content for ether blends.

Arizona's Cleaner-Burning Gasoline regulations for Phoenix (Maricopa County) were changed effective in 1999:

  • CARB Phase 2 RFG or federal Phase II RFG VOC/NOx/oxygen (not including federal benzene and toxics standards),
  • summer max. 7.0 psi RVP and winter max. 9.0 psi RVP (no change), and
  • winter - 10 vol% for ethanol or min. 2.7 wt% oxygen content for ether blends (no change).

SB1504, signed by the Governor in April 2000, eliminates the minimum oxygen requirement for Phoenix in the summer months, requires the State DWM to report by 1/1/2001 on refiner/supplier plans to phaseout MTBE no later than 180 days after California, and states that the policy of the State is to phaseout MTBE as soon as it is feasible. Effective February 9, 2001, Arizona revised the CBG regulations to eliminate the summertime oxygen content requirement (see 7 A.A.R. 1025).

For winters starting November 2000, Phoenix required CARB Phase 2 RFG only (no alternative for federal Phase II RFG) with winter 10 vol% ethanol mandate (no ether option) and max. 9.0 psi RVP.

Arizona's Cleaner-Burning Gasoline area also includes Mesa, Scottsdale, Tempe, Chandler, Glendale, 17 other jurisdictions and unincorporated County lands. In addition, it includes some western portions of Pinal County (the Apache Junction area) and a small part of Yavapai County (just north of Lake Pleasant).

Tucson has a winter (Sept. 30 - March 31) oxygenated gasoline (min. 1.8 wt%) program.

See Arizona Revised Statutes, Title 41, Chapter 15, Article 6 and Arizona Administrative Code Title 20, Chapter 2, Article 7.

In a letter dated August 20, 2003, EPA announced enforcement discretion for one month from the Cleaner Burning Gasoline requirement for Phoenix because of a pipeline disruption in supply. On September 3, 2003, EPA notified AZ that this CBG enforcement discretion in Phoenix would be lifted early. It expired on September 6. Although distributors cannot continue to send conventional gasoline to retailers in Phoenix, retailers that still had conventional gasoline received prior to September 6 could continue to sell that gasoline.

Signed by the Governor on May 11, 2004, HB 2142, as amended, bans MTBE exceeding 0.3 vol% in gasoline beginning on January 1, 2005. SB 1154, signed by the Governor 4/11/05, bans more than 0.1 wt% oxygen content collectively from several ethers (i.e. ETBE) in gasoline, effective 1/1/06.

Signed by the Governor on June 1, 2004, HB 2207, as amended, replaces CARB Phase 2 gasoline with CARB Phase 3 gasoline in the Phoenix area effective January 1, 2005 and eliminates February and March from the winter season gasoline requirements.

Effective 11/11/06, many changes were made to the AZ CBG regulations, including shortening the winter oxygenate season to November 1 - January 31 (rather than Nov. 2 - March 31), establishing a higher max. RVP in Feb. and March, and setting the max. RVP to 7.0 psi for CARB Phase 2 gasoline and to 7.2 psi for CARB Phase 3 gasoline.

Arizona Administrative Code Title 20, Chapter 2, Article 7 requires that gasoline meet the test requirements of ASTM D 4814 and that diesel fuel meet the test requirements of ASTM D 975. See R20-2-714 and R20-2-715.

As a result of the disruption in supply of fuel from Gulf-area refineries and pipelines and a fire at a fuel distribution terminal, EPA temporarily waived certain requirements for gasoline sold and distributed in Phoenix and the surrounding area in a letter dated 10/10/08.


Last updated October 2008