Learn the Issues
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2005 v4.2 Technical Support Document
Technical Support Document for the Final Transport Rule describes how updated 2005 NEI, version 2 emissions and were processed for air quality modeling in support of the Cross-state Air Pollution Rule (CSAPR).
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2005 v4.3 Technical Support Document
Emissions Modeling for the Final Mercury and Air Toxics Standards Technical Support Document describes how updated 2005 NEI, version 2 emissions were processed for air quality modeling in support of the final Mercury and Air Toxics Standards (MATS).
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2007 Version 5.0 Technical Support Document
Preparation of Emissions Inventories for the Version 5.0, 2007 Emissions Modeling Platform describes how emissions based on the 2008 NEI, version 2 and were processed to represent the year 2007 in support of air quality modeling of the PM NAAQS.
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2011 Version 6.1 Technical Support Document
This TSD describes how the emission inventories were prepared for air quality modeling for the years 2011, 2018, and 2025 using the 2011, version 6.1 emissions modeling platform, which is based on the 2011 National Emissions Inventory, Version 1.
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2005 v4.1 Technical Support Document
Preparation of Emission Inventories for the Version 4.1, 2005-based Platform describes how emissions from the 2005 NEI, version 2 and were processed for air quality modeling in support of the Boiler MACT and the Mercury and Air Toxics Standards.
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2011 Version 6.0 Technical Support Document
This TSD describes how the emission inventories were prepared for air quality modeling for the years 2011, 2018, and 2025 using the 2011, version 6.0 emissions modeling platform, which is based on the 2011 National Emissions Inventory, Version 1
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2022v2 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 2022.
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McGraw-Edison Superfund Site, City of Centerville, Appanoose County, Iowa - Second Five-Year Review Report
Second Five-Year Review Report, McGraw-Edison Superfund Site, City of Centerville, Appanoose County, Iowa
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Chemplex Site, Clinton County, Iowa - Fourth Five-Year Review Report
Fourth Five-Year Review Report, Chemplex Site, Clinton County, Iowa
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Report a Violation
Learn about reporting environmental violations and instances of fraud, waste and abuse.
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Stormwater Controls-Additional Resources
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-Conditional "No Exposure" Exclusion
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-Fact Sheets and Guidance
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-Electronic Reporting
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-Threatened and Endangered Species
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-EPA's 2021 MSGP
EPA’s 2021 MSGP applies in areas of the country where EPA is the NPDES permitting authority and has made the permit available for coverage.
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Stormwater Discharges from Industrial Activities
Federal regulations require stormwater discharges associated with industrial activity to be covered under NPDES permits.
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Stormwater Discharges from Industrial Activities-EPA's Proposed 2026 MSGP
EPA’s 2021 MSGP applies in areas of the country where EPA is the NPDES permitting authority and has made the permit available for coverage.
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Animal Feeding Operations - NPDES CAFO Permitting
Most states are authorized to issue NPDES permits. The operator of a concentrated animal feeding operation (CAFO) in an authorized state should request coverage from the appropriate state agency and utilize the appropriate state forms.
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Managing Aquaculture to Protect Water Quality
Aquaculture permitting in the NPDES program. Description and resources are provided.