Learn the Issues
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Air Permit Delegation and PSD SIP Approval Status in EPA's Pacific Southwest (Region 9)
Federal air regulations that have been delegated to state or local air pollution control agencies in EPA's Pacific Southwest, Region 9.
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Webinar: Managing Indoor Air Quality Before and During Wildfire Smoke Events: Smoke-Ready Schools
Recording of April 15, 2025, Webinar: Managing indoor air quality before and during wildfire Smoke Events: Smoke-Ready Schools
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About Title V Permitting in Region 9
Part 71 permits in progress or issued by EPA Pacific Southwest, Region 9.
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I will be making renewable gasoline from renewable crude. Section 80.1115(b)(6) of the regulations says I must use an Equivalence Value of 1.0 even though renewable gasoline clearly warrants a higher Equivalence Value. Can I submit a petition?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Yes. See regulation Section 80.1115(c)(2). However, for renewable fuels other than renewable diesel which are made from renewable crudes, information on the energy content and/or renewable content may be difficult to obtain. This is why we designated the…
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I will be making ethanol from both cellulosic feedstocks and corn in my plant. How do I know what Equivalence Value to use, and how do I assign RINs to batches?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The batches of each type of ethanol (cellulosic or corn) should be measured independently and precisely, according to the separate processes used to produce them in the plant. Once separate batch numbers are created and RINs are generated…
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I have not seen a reference to the EPA CDX system. Is the CDX system already established or can we submit reports in our choice of electronic formats?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The Central Data Exchange (CDX) is an established portal through which electronic data are submitted. All registered parties will have to first register with CDX in order to receive a CDX registration number. More information may be found…
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How should a party producing reformulated gasoline or RBOB make the designation of per gallon or average for the appropriate fuel parameters?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . If filing by paper, the party should submit the Annual Compliance Designation with its first quarter batch reports. If filing electronically, the first batch report transmitted must include the designations which will apply to each subsequent batch for…
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How do owners of the ethanol account for product samples taken at the plant and downstream relative to RINs? Likewise, how is standard product shrinkage (i.e. when ethanol is transferred to a terminal) handled relative to RINs?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . In general, the RINs associated with small volumes removed for sampling and testing, or lost due to evaporation, leakage, or metering imprecision, remain valid for RFS compliance purposes. Small volume losses can be accommodated through the regulatory provision…
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Affected States Notifications in EPA's Pacific Southwest
Information about Tribes approved for Treatment as a State (TAS) in EPA's Pacific Southwest (Region 9).
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How can a marketer transfer RINs with a K code of 1 and fulfill the requirement that "No person may transfer a RIN that has a K code of 1 without transferring an appropriate volume of renewable fuel to the same person on the same day" ?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . A party may transfer any volume of renewable fuel to any other party without simultaneously transferring any assigned RINs to that same party. However, assigned RINs can only be transferred to another party in association with the transfer…
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Clean Air Act Permitting in California
Information on Clean Air Act Permitting in California and EPA's oversight.
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Building Resilient Communities with Green Infrastructure and Hazard Mitigation Planning
This webcast will address strategies and lessons learned from two dynamic outreach and education programs.
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What is the definition of oxygenated fuels program control area and oxygenated fuels program control period?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . As per section 80.2 of the regulations, an oxygenated fuels program control area means a geographic area in which only oxygenated gasoline may be sold or dispensed during the control period. An oxygenated fuels program control period means…
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2021 Emissions Modeling Platform Technical Support Document
This document describes how the emission inventories were prepared for air quality modeling by the U.S. Environmental Protection Agency (EPA) for criteria air pollutants to represent the year of 2020.
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What is the definition of sulfur in gasoline?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The sulfur portion of all sulfur forms and compounds. (7/1/94) This question and answer was posted at
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What constitutes a batch of reformulated gasoline? What method should be used by refiners, importers and oxygenate blenders for determining the volume of a batch of reformulated gasoline? What method should be used by independent laboratories? If a refiner is to report the tank volume at the time that a sample is collected, this may result in double-counting because the tank would not be emptied before blendstocks are added to produce the next batch. For example, suppose the volume in a tank is 100,000 barrels for batch 1, which is sampled and tested. Subsequently, there are two shipments from this tank, a 50,000 barrel shipment and a 20,000 barrel shipment, leaving 30,000 barrels in the tank. The tank is then blended up to 90,000 barrels for batch 2, which is sampled and tested, with subsequent shipments of 28,000 barrels and 44,000 barrels. Should the reported volume for batch 1 be 100,000 barrels or 70,000 barrels? Should the reported volume for batch 2 be 90,000 barrels or 72,000 barrels?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Section 80.2(gg) defines a "batch of reformulated gasoline" as "a quantity of reformulated gasoline which is homogeneous with regard to those properties which are specified for reformulated gasoline certification." The reported volume for the batch should be the…
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Good Samaritan Remediation of Abandoned Hardrock Mines Program
An overview of the new Good Samaritan Remediation of Abandoned Hardrock Mines Program
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Frequent Questions on the Phasedown of Hydrofluorocarbons
FAQ for HFC phasedown program
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What business activity should producers and marketers register under?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Producers and marketers should register as RIN owners and, as appropriate as an ethanol producer/importer, biodiesel producer/importer, and under any other category that applies to them. Registration is available on-line at Registration for Fuel Programs . If a…
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Regarding the requirement in § 80.69(a)(2) that refiners and importers blend a representative sample of an RBOB batch with refinery-specified oxygenate, the composition of specified oxygenate blended in the laboratory is likely to differ from the composition of oxygenate arriving at the blender terminal, in that smaller amounts of oxygenates may be present. May these smaller amounts of oxygenates be included for meeting the refiner's blending instructions where a particular oxygenate type has been specified by the refiner or importer?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . EPA will not consider the refiner's blending instructions to be compromised where the specified oxygenate contains de minimis amounts of other oxygenates resulting in the RFG produced to contain other oxygenates in amounts no more than: 0.4 vol%…