Iowa Admin. Code r. 21-12.4
All motor vehicle fuel kept, offered or exposed for sale or sold at retail containing over 1 percent ethanol by volume shall be identified with a decal located on front of the motor vehicle fuel pump and placed between 30″ and 50″ above the driveway level or in an alternative location approved by the department. The appearance of the decal shall conform to the following standards adopted by the renewable fuels and coproducts advisory committee:
[ARC 2577C, IAB 6/8/16, effective 7/13/16]