Learn the Issues
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EPA is requested to act on behalf of the Seminole Tribe of Florida as the Clean Water Act Section 401 water quality certification authority for the 2026 Nationwide Permits
R4 EPA has received a request for CWA Section 401 water quality certification for the 2026 Nationwide Permits from the Jacksonville District of the Army Corps of Engineers to certify on behalf of the Seminole Tribe of Florida in Indian Country where the Tr
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EPA is requested to act on behalf of the Poarch Band of Creek Indians as the Clean Water Act Section 401 water quality certification authority for the 2026 Nationwide Permits
R4 EPA has received a request for CWA Section 401 water quality certification for the 2026 Nationwide Permits from the Mobile District of the Army Corps of Engineers to certify on behalf of the Poarch Band of Creek Indians.
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EPA is requested to act on behalf of the Mississippi Band of Choctaw Indians as the Clean Water Act Section 401 water quality certification authority for the 2026 Nationwide Permits
R4 EPA has received a request for CWA Section 401 water quality certification for the 2026 Nationwide Permits from the Vicksburg District of the Army Corps of Engineers to certify on behalf of the Mississippi Band of Choctaw Indians.
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Radiation at Superfund Sites
Access information and guidance for EPA remedial project managers about the cleanup of radioactive contamination at Superfund sites.
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Air Emissions Inventory Listservs
CHIEF Listserv provides updates on emission factor and inventory information via e-mail. NEI Listserv fosters communication with EPA Offices, State/Local Agencies, Tribes in preparation of the NEI
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2019 International Emissions Inventory Conference - Collaborative Partnerships to Advance Science and Policy
The conference will focus on how emission inventories meet the challenges posed by having to apply science and at the same time streamline processes to improve the resulting inventories.
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A Best Practices Guide for Talking to your Customers about Chronic Contaminants in Drinking Water
This fact sheet helps one to understand the importance of communicating with the public about chronic contaminants – both regulated and unregulated. It also describes effective strategies for getting your message out.
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Method 3C - Carbon Dioxide, Methane, Nitrogen and Oxygen Concentrations - Thermal Conductivity Detector
CFR Promulgated Test Method 3C - Determination of carbon dioxide, methane, nitrogen, and oxygen from stationary sources using a Thermal Conductivity Detector.
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Method 5D - Particulate Matter Baghouses
CFR Promulgated Test Method 5D PM Baghouses (Particulate Matter)
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Method 1A - Small Ducts
Method 1A - Small Ducts
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Method 13A - Total Fluoride - SPADNS Zirconium Lake
CFR Promulgated Test Method 13A Determination of Total Fluoride Emissions From Stationary Sources (SPADNS Zirconium Lake Method)
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Method 2D - Rate Meters
Test Method 2D, Measurement of gas volume flow rates in small pipes and ducts.
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Method 2A - Volume Meters
CFR Promulgated Test Method 2A, Direct Measurement of Gas Volume Through Pipes and Small Ducts.
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Method 5E - Particulate Matter Fiberglass Plants
CFR Promulgated Test Method 5E PM Fiberglass Plants (Particulate Matter)
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Method 2C - Standard Pitot
CFR Promulgated Test Method 2C Standard Pitot
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Method 13B - Total Fluoride - Specific Ion Electrode
CFR Promulgated Test Method 13B Determination of Total Fluoride Emissions From Stationary Sources (Specific Ion Electrode Method)
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Method 6A - Sulfur Dioxide and Carbon Dioxide
CFR Promulgated Test Method 6A Determination of Sulfur Dioxide, Moisture, and Carbon Dioxide From Fossil Fuel Combustion Sources
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Method 6 - Sulfur Dioxide
CFR Promulgated Test Method 6 Determination of sulfur dioxide emissions from stationary sources
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Method 7A - Nitrogen Oxide - Ion Chromatographic Method
CFR Promulgated Test Method 7A Determination of nitrogen oxide emissions from stationary sources - Ion chromatographic method
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Method 6B - Sulfur Dioxide and Carbon Dioxide - Daily Average Emissions
CFR Promulgated Test Method 6B Determination of sulfur dioxide and carbon dioxide daily average emissions from fossil fuel combustion sources.