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Fuel Quality

The purpose of the fuel quality program is to ensure motor fuels meet minimum standards for a number of different quality measures. Measures may include octane value, water content and other contaminants, distillation, vapor pressure, and ethanol content in gasoline; in diesel the flash point, water content and other contaminants, cetane index, and viscosity are tested.

TDA inspectors sample motor fuel for fuel quality testing through routine and complaint inspections.  Inspectors may use a portable octane analyzer and/or they may collect samples and submit them to an independent lab for analysis.

The octane rating of gasoline sold or offered for sale must not be less than the octane posted on the gas pump.  If gasoline samples are found to be in violation of the posted octane rating, TDA has the authority to assess and collect administrative penalties against an individual retail motor fuel outlet.

TDA may issue stop sale orders and administrative penalties for fuel that inspectors find to be non-compliant with quality standards/tolerances established by National Institute of Standards and Technology (NIST) and the American Society of Testing and Materials (ASTM).


Distributors, Wholesalers, Jobbers and Suppliers
Distributors, wholesalers, jobbers, and suppliers must register with the Department annually. To register, a company must submit an application and pay the appropriate fees.  

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