Learn the Issues
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Navajo Nation Abandoned Uranium Mines Cleanup
This site provides information about the progress of EPA's cleanup of abandoned uranium mines on the Navajo Nation, including health impacts, major enforcement and removal milestones, and community actions.
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Unexploded Ordnance Management Principles
This page contains a memo and interim guidance regarding unexploded ordnance at closed, transferring, and transferred ranges.
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SERC-TERC Update: May 2023
SERC-TERC Update: March 2024
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Are there different RBOBs for ethanol than for MTBE? Kindly list the types of RBOBs with all the acceptable oxygenates or ethers for each RBOB.
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. Yes. The generic RBOB types are as follows: "Any oxygenate," "Any renewable oxygenate," "Any ether," "Any renewable ether," and "Non-VOC controlled renewable ether only." There are several legal oxygenates which may be blended with the various types of RBOB…
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Are specialty batches of gasoline (e.g. test fuels for the Auto-Oil research program) included in the baseline? Or are they considered "not introduced into commerce"?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. Specialty batches of gasoline in very limited volumes may be interpreted to be "not introduced into commerce," subject to EPA approval. (7/1/94) This question and answer was posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers…
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Can ether RFG and alcohol RFG be mixed outside the VOC season provided the substantially similar requirements are not violated.
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. VOC-controlled RFG produced with ethanol cannot be mixed with VOC-controlled any-oxygenate RFG from January 1, through September 15 at any point in the distribution system, including at retail outlets and wholesale-purchaser consumers facilities. (7/1/94) This question and answer was…
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Operation and Maintenance Resources for Small Drinking Water Systems
These documents and tools provide information on identifying treatment technologies that remove multiple contaminants, schedules for maintenance tasks and checklists, and logs for easily recording findings.
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Previous Federal Agency Hazardous Waste Compliance Docket Updates
The Federal Agency Hazardous Waste Compliance Docket contains information reported to EPA by federal facilities that manage hazardous waste or from which hazardous substances, pollutants, or contaminants have been - or may be - released.
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Phosphogypsum
Phosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. The phosphate ore and the resulting phosphogypsum contain radium, which decays to form radon gas. Both radium and radon are rad
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Lesson 2: End of Lesson
You've completed Lesson 2, Quick Tour of the Final Rule, of CROMERR 101.
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Cleanups in My Community Web Map Service and More
This bridge page links to the CIMC Web Service and provides access to the latest GeoDatabase.
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Lesson 6: End of Lesson
You've completed Lesson 6 of CROMERR 101, Using the Checklist to Work through System Requirements!
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Lesson 4: End of Lesson
You've completed Lesson 4 of CROMERR 101, The EPA Review and Approval Process Under Part 3!
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Lesson 6: Using the Checklist to Work through System Requirements
Lesson 6 describes how these same requirements are presented in the CROMERR System Checklist (which was introduced in Lesson 4). You may want to refer to the checklist as you step through this lesson.
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Lesson 3: End of Lesson
You've completed Lesson 3 of CROMERR 101, Application Requirements!
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Fact Sheet for the 2026 Interim Guidance on the Destruction and Disposal of PFAS
This 2026 update of the U.S. Environmental Protection Agency (EPA) interim guidance presents currently available information on the destruction and disposal of perfluoroalkyl and polyfluoroalkyl substances (PFAS) and PFAS-containing materials.
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Notice for Lead Action Level Exceedance at SIERRA Public Water System in Santa Fe County, NM
Recent drinking water samples taken by the SIERRA Public Water System (PWS ID: NM3502026) located in Santa Fe County, New Mexico, found elevated levels of lead in some homes and/or buildings.
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What are the differences between the summer and winter models and what is their justification?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. The equations, extrapolations, and normal-to-high emitter ratios remain the same when one switches from the summer version of the Complex Model to the winter version. However, four changes do take place. First, the baseline fuel is changed from the…
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What is the affect of a "clean" attestation and/or regulatory audit on subsequent compliance violations identified?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. An attestation engagement report for the refinery or importer that indicates no discrepancies has no bearing on a violation by the refiner or importer that may be determined by EPA. With regard to the CPA or CIA who conducted…
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What is the responsibility of the independent lab in determining whether a tank of RFG meets the definition of "batch," i.e., is homogeneous with regard to the RFG properties?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help. The independent sampling and testing provisions require the independent lab to collect a separate sample from each batch of RFG. "Batch of reformulated gasoline" is defined at § 80.2(gg) as "a quantity of reformulated gasoline which is homogeneous with…