Science & Technology
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Memo: Re-analysis of the relationship between 24-hour and 4-hour visibility index levels
Memo describing the relationship between 24-hour and 4-hour visibility index levels in support of the PM NAAQS review
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Memo: Updated comparison of 24-hour PM2.5 design values and visibility index design
Memo describing an updated comparison of 24-hour PM2.5 design values and visibility index design values in support of the PM NAAQS review.
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Historical Water Quality Criteria Documents
Reference Documents from the 1980s
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2017 Draft Aquatic Life Criteria for Aluminum in Freshwater
EPA has released draft updated aluminum aquatic life ambient water quality criteria for freshwater under Section 304(a)(1) of the Clean Water Act. EPA will accept public comments on the draft criteria for 60 days upon publication in the Federal Register.
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National Recommended Water Quality Criteria Tables
This water quality criteria table has all current national recommended water quality criteria and links to relevant documents
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Common Effects Methodology National Stakeholder Meeting December 1, 2010
EPA is exploring how to build on the substantial high quality science developed under both OPP programs to develop additional tools and approaches to support a consistent and common set of effects characterization methods using best available information.
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Human Health Criteria - Methylmercury
Documents pertaining to 2010 Human Heath Water Quality Criteria and Guidance Implementation for Methylmercury. These document include the safe levels for Methylmercury to protect human health.
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Reference Library of Water Quality Criteria
Information related to Water Quality Criteria Reference Library
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Common Effects Methodology Regional Stakeholder Meeting January 11 -22, 2010
EPA is exploring how to build on the substantial high quality science developed under both OPP programs to develop additional tools and approaches to support a consistent and common set of effects characterization methods using best available information.
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Fact Sheet: Estuarine and Coastal Marine Waters - Bioassessment and Biocriteria Technical Guidance
Fact Sheet: Estuarine and Coastal Marine Waters: Bioassessment and Biocriteria Technical Guidance
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Biological Water Quality Criteria
Page contains links to Technical Documents pertaining to Biological Water Quality Criteria, including, technical assistance documents for states, tribes and territories, program overviews, and case studies.
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Non-attainment in Maine: Problem Identification and Solution
Case Studies: Using bioassessments and biocriteria to identify impaired waters and causes of impairment
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Support for Permit Limits in Ohio
Support for Permit Limits in Ohio
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Fact Sheet: Methodology for Deriving Ambient Water Quality Criteria for the Protection of Human Health - Revised Methodology (2000)
Fact Sheet: Methodology for Deriving Ambient Water Quality Criteria for the Protection of Human Health - Revised Methodology (2000)
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Final Recommended Aquatic Life Ambient Water Quality Criteria for Diazinon
Information related to Final Recommended Aquatic Life Ambient Water Quality Criteria for Diazinon.
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Learn About the Toxic Substances Control Act (TSCA)
This page provides an overview of TSCA authorities as well as specific sections of TSCA.
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EPA Releases Draft Revised TSCA Risk Determination for 1,4-Dioxane
EPA announces its draft revised risk determination for 1,4-dioxane in July 2023 available for public comment until September 2023.
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EPA Releases Draft Supplement to the Risk Evaluation for 1,4-Dioxane
EPA announces the release of the 2023 draft supplement to the 2020 risk evaluation for 1,4-dioxane for public comment and peer review.
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Water Filter Education Handouts
EPA and its partners have developed educational resources to help community members properly use and maintain water filters, including a toolkit and handouts.