Internal Services and Consumer Protection

In 1997, Oregon adopted the American Society for Testing and Materials (ASTM) national standards for motor fuel. The adoption of these national standards, along with state motor fuel quality laws, established the Oregon Department of Agriculture Motor Fuel Quality Program. Program responsibilities include the following:

  • Ensuring that the 2.1 billion gallons of motor vehicle gasoline, diesel and biofuels sold in Oregon each year meet national standards and specifications for quality. 
    • ​This is achieved through inspections, field tests/screenings, complaint investigations, document review and lab tests 
  • Enforcing Oregon’s Renewable Fuel Standards of 10% ethanol in gasoline and 5% biodiesel in diesel fuel
  • Investigating complaints regarding motor fuel quality
Oregon Weights and Measures routinely perform basic quality control inspections of all motor fuels offered for sale. Before the fuel dispensers are tested at a gas station the fuel is inspected to make sure that it is suitable for sale.


Water is the most common consumer complaint received regarding motor fuel. Motor fuels offered for sale at a refueling station are checked for evidence of water contamination at key points in the underground storage tank system. The storage tank fill pipe is checked for proper seals, the fuel inside the tank is tested for contamination, and product dispensed through the nozzle is inspected to ensure it is free of water as well.


Anti knock index, or octane, is used to price gasoline in the U.S. market. ODA checks all grades of gasoline offered for sale at each gas station to make certain that the posted octane rating correctly represents the gasoline sold. Three basic checks are routinely performed 

  • Dispenser blending ratios are verified 
  • Product certification documents are inspected
  • Fuel is tested using portable octane analyzers


ODA places a high priority on fuel quality complaints because it is difficult to substantiate a complaint after one or more fresh fuel deliveries have been made at a gas station. 


Motor Fuel Quality regulations for the State of Oregon are found in Oregon Revised Statute 646, Trade Practices and Antitrust Regulation. 


OAR 603-027: Sale by weight or measure

Law or rule



Steve Harrington
Program Manager
Weights and Measures
635 Capitol St NE
Salem, OR 97301
Phone: 503-986-4677