Learn the Issues
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TMDLs at Work: Diamond Lake
The documents detail the Diamond Lake TMDL at work.
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TMDLs at Work: Lynnhaven River Watershed
The documents detail the Lynnhaven River Watershed TMDL at work.
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Environmental Crime Victim Resources - Utah
A resource listing for environmental crime victims
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NPDES eReporting – Information and Resources for Authorized Programs
This page provides detailed information on National Pollutant Discharge Elimination System (NPDES) electronic reporting for Authorized NPDES Programs
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Visibility and Regional Haze
Haze forms when sunlight encounters particle pollution. It reduces visibility in cities and scenic areas. This web area provides regulatory information and progress towards improving visibility through EPA’s regional haze program.
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Methane Super Emitter Program: Certified Third-Party Notifiers
third-party notifiers
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Methane Super Emitter Program: Owners & Operators
Instructions for owners and operators of oil and gas facilities
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Final Supplemental Environmental Impact Statement for Eastern Long Island Sound
This ELIS FSEIS is intended to support the final rule for the designation of an eastern Long Island Sound dredged material disposal site.
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UIC Permits in EPA's Pacific Southwest (Region 9)
Underground Injection Control (UIC) permits in EPA's Pacific Southwest, Region 9.
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American Iron and Steel Requirement - Waiver Requests Received by EPA
AIS waiver requests received by EPA
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Explain Working Levels (WL) and Picocuries Per Liter of Air (pCi/L).
Radon test results may be reported in three different measures – picocuries per liter (pCi/L), Working Levels (WL) and becquerels per meter cubed (Bq/m 3). If your test result is in pCi/L, the EPA recommends you fix your home if the radon level is 4 pCi/L (150 Bq/m 3)or higher…
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Regulations, Guidance, and Additional Information about the Marine Protection, Research and Sanctuaries Act
Provides links to MPRSA regulations, guidance documents for the transport and disposition of materials into the ocean, and important MPRSA websites
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Standards of Practice
For builders and contractors, check out the resources listed on this page and learn about radon-resistant construction.
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Marine Protection Permitting in EPA Region 4
Overview of marine protection permitting in Southeast United States. Includes materials dumped in the Region, MPRSA permits issues, dredged material testing guidance, ocean site descriptions and information, regional dredging teams and other partnerships
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What is Radon?
Radon is a radioactive gas that forms naturally when uranium, thorium, or radium, which are radioactive metals break down in rocks, soil and groundwater. People can be exposed to radon primarily from breathing radon in air that comes through cracks and gaps in buildings and homes. Because radon comes naturally…
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Radon Resources for Real Estate Community
For home buyers and sellers, check out the resources listed on this page and learn how to fix your home and learn about radon-resistant construction.
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How much can a radon mitigation system cost?
You have tested your home for radon, but now what? If you have tested your home for radon and confirmed that you have elevated radon levels, 4 picocuries per liter (150 becquerels per cubic meter (Bq/m 3))in air (pCi/L) or higher, our guidance can help you: Select a qualified radon…
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Are we sure that radon is a health risk?
The EPA already has a wealth of scientific data on the relationship between radon exposure and the development of lung cancer. The scientific experts agree that the occupational miner data is a very solid base from which to estimate risk of lung cancer deaths annually. While residential radon epidemiology studies…
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How often should I test/retest my home for radon?
Our general guidance from A Citizen's Guide to Radon - (December 2016, EPA 402/K12/002) - suggests: If your living patterns change and you begin occupying a lower level of your home (such as a basement) you should retest your home on that level. Even if your test result is below…
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How to Protect Your Family from Radon When Buying a Newly Built Home
When buying a recently built home, EPA recommends you check for radon resistant features and follow certain techniques if you purchase a home in a high radon area.