Learn the Issues
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Monitoring Surface Water Chemistry
Learn about how EPA uses Long Term Monitoring (LTM) and Temporily Integrated Monitoring of Ecosystems (TIME) to track the effect of the Clean Air Act Amendments on acidity of surface waters in the eastern U.S.
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Historic Key Program Dates
Key dates in 2022 for Clean Air Markets programs.
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Latest Emission Comparisons & Pollution Controls
Learn about the changes in SO₂ and NOₓ emissions from coal-fired power plants subject to the Acid Rain Program (ARP) and/or the Cross-State Air Pollution Rule (CSAPR).
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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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Ports Primer: A4. Endnotes and Image Sources
The Ports Primer appendix includes endnotes and image sources.
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Waters of the United States
Information regarding the revised definition of Waters of the United States
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Data Explorer
eGRID tool
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Historical Reports
View historical reports from EPA's Acid Rain Program, Clean Air Interstate Rule, NOx Budget Trading Program, and the OTC NOx Budget Program.
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EPA General Terms and Conditions Effective October 1, 2021 or later
The recipient and any subrecipient must comply with the applicable EPA general terms and conditions outlined below. These terms and conditions are in addition to the assurances and certifications made as part of the award and terms, conditions, and restric
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Generic Ecological Assessment Endpoints (GEAE) for Ecological Risk Assessment
The purpose of this document is to build on existing EPA guidance and experience in ecological risk assessment and provide guidance to risk assessors involved in conducting an ecological assessment.
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Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens
This Supplemental Guidance does not establish any substantive “rules” under the Administrative Procedure Act or any other law and has no binding effect on EPA or any regulated entity, but instead represents a non-binding statement of policy.
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Framework for Application of the Toxicity Equivalence Methodology for Polychlorinated Dioxins, Furans, and Biphenyls in Ecological Risk Assessment
This framework is intended to assist EPA scientists in using the toxicity equivalence methodology in ecological risk assessments that involve dioxins and dioxin-like chemicals.
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Supplement to RAGS Part A: Community Involvement in Superfund Risk Assessments (1999)
Supplement to Risk Assessment Guidance for Superfund: Part A: provides the site team--risk assessor, remedial project manager, and community involvement coordinator--with information to improve community involvement in the Superfund risk assessment
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Guidance for Evaluating and Documenting the Quality of Existing Scientific and Technical Information
Guidance for assessing and accepting existing scientific and technical information, and documenting the review and analysis of existing scientific and technical
information.
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Protecting Underground Sources of Drinking Water from Underground Injection (UIC)
Provide information on: individual injection well classes; regulations specific to each well class; technical guidance; compliance assistance; federal, state, and tribal/territory roles and responsibilities.
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2026 EnviroFlash Announcements about EPA Fuel Programs
2026 EnviroFlash announcements from the EPA Fuel Programs.
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Podcast: Compendium of Open Recommendations
Podcast: Compendium of Open Recommendations: Data as of May 31, 2026
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Methane Emissions from the Oil and Gas Sector
EPA’s Voluntary Methane Programs encourage oil and natural gas companies to adopt cost-effective technologies and practices that improve operational efficiency and reduce emissions of methane, a potent greenhouse gas.
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EPA Cleanups: Communities around New Bedford Harbor
Information about about the science, technical information, and environmental protection laws behind cleanup decisions for the New Bedford Harbor.
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Divulgations sur les risques potentiels liés au plomb dans l'immobilier
Informations pour les acheteurs, les locataires, les gestionnaires de biens, les propriétaires, les agents immobiliers et les vendeurs.