Frequent Questions

Many states have adopted a 1.0 psi waiver for ethanol blends during the RVP control period. In areas where RFG is required, do states need to amend that regulation in any fashion in order to not be in conflict with RFG requirements?

In areas where RFG is required, states are preempted from having RVP requirements which are different from the RFG simple model requirements unless those requirements are approved by EPA as a SIP amendment which is necessary to attain a national ambient air quality standard. In any case, the federal regulation applies and regulated parties must meet the RVP and other requirements applicable to RFG.(7/1/94)

This question and answer is posted at The original was posted in the Q&A posted on 7/1/94 which can found at" See Question ID 3857 for RFG (Taken from the first question on
Have more questions? Submit a request