Learn the Issues
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TMDL Report and Approval Documents for Parker River Watershed, MA
View supporting documents for the Parker River Watershed in Massachusetts.
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Steps to Get the Safer Choice Label on Your Product
EPA allows the use of the Safer Choice Label by high-performance products that demonstrate safer chemistry
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PCS-ICIS Operator Definition
The Permit Compliance System (PCS) provides information on companies which have been issued permits to discharge waste water into rivers.
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PCS-ICIS Overview
The Permit Compliance System (PCS) provides information on companies which have been issued permits to discharge waste water into rivers.
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Future of Climate Change
The future of climate change describes how the changes and impacts we are already seeing are anticipated to evolve in the years to come.
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PCS-ICIS Customized Search
The Permit Compliance System (PCS) provides information on companies which have been issued permits to discharge waste water into rivers.
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Particle Pollution Designations - Where You Live
Particle pollution state and tribal designations
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Northern Indiana Public Service Company Bailly Generating Station Current Documents, Reports and Graphics for 2014
Documents, Reports and Graphics for Northern Indiana Public Service Company Bailly Generating Station
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Information on Sites Eligible for Brownfields Funding under CERCLA § 104(k)
EPA will use the information outlined in the document to determine if sites are eligible for brownfields funding under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) § 104(k).
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Why did NOAA recalculate the historic time series record of Lake Erie harmful algal bloom severity in 2025?
Recent advances in satellite technology give scientists a much clearer picture of what’s happening with harmful algal blooms in large bodies of water like Lake Erie. Modern satellites provide imagery nearly daily and at nine times the spatial resolution as before. They can more accurately detect and quantify the amount…
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What changed when NOAA updated their time series record in 2025?
With the recent calibration of data, on average, the severity level of annual blooms since 2013 has been lowered. For example, the formerly classified “severe” bloom in 2021 will now be classified as a “moderately severe” bloom. 2011 and 2015 are still considered “very severe” blooms (i.e., greater than 7…
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Has the goal for what we are trying to achieve in Lake Erie changed?
No. NOAA’s update to their time series record does not change the definition of a “severe” or “mild” bloom, nor does it change the goal to achieve only a “mild” or no harmful algal bloom on an annual basis. More specifically, in the 2012 Great Lakes Water Quality Agreement, Canada…
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Does the change provide any new insight on progress being made in Lake Erie?
NOAA’s updated time series shows a decline in bloom severity since 2019. This is consistent with the Annex 4 Adaptive Management Task Team’s assessment that lake conditions appear to no longer be getting worse. See: 5-Year Binational Adaptive Management Evaluation for Lake Erie (2017-2021): Measuring the Ecosystem Response to Nutrients…
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What happens next?
Any new assessments of HAB severity will use the updated time series for comparison. While there may be minor adjustments as NOAA continues to review the data quality and processing methods, researchers do not anticipate any significant changes to the HABs severity index now that the Copernicus Sentinel 3 satellite…
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Pollution Prevention Works: A Storytelling Challenge for Students, 2023 Winners
This page provides an overview of the TRI Pollution Prevention Video Challenge.
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EMC Technical Information Documents
EMC Information Documents explain the derivation of factors, equations, and procedures, and provide technical information.
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If a permit is prioritized for enhanced outreach, does this mean that EPA will require stricter emission or discharge limits, or deny a permit?
An EPA regional’ office’s decisions on whether to issue a permit and, if so, the conditions to impose within a permit are distinct from the EPA regional office’s decisions about the outreach EPA may perform during the permitting process. EPA’s decisions on whether to issue a permit and what permit…
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Performance Specification 9 for Gas Chromatographic Continuous Emission Monitoring System
Performance Specification 9 - Specifications and Test Procedures for Gas Chromatographic Continuous Emission Monitoring System in Stationary Sources
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Method 326 Determination of Isocyanates in Stationary Source Emissions
Determination of Isocyanates in Stationary Source Emissions
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Method 204 - Permanent (PTE) or Temporary Total Enclosure (TTE) for Determining Capture Efficiency
Promulgated CFR Test Method 204 Criteria for and Verification of a Permanent or Temporary Total Enclosure.