Learn the Issues
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Regional and State NPDES Program and Permit Quality Review (PQR) Reports
Regional NPDES Program Reviews summarize recent program findings
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EPA’s Response to Requests for Extension of the Comment Period on the Draft 2016 Pesticide General Permit
EPA decision to not extend the comment period on the draft 2016 Pesticide General Permit.
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Pre-Publication Version of Notice of Proposed Rulemaking for Criminal Negligence Standard for State Clean Water Act 402 and 404 Programs
The EPA Administrator signed the following notice of proposed rulemaking on December 1, 2020, and EPA is submitting it for publication in the Federal Register (FR).
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RSEI Toxicity-Data and Calculations
Detailed information on how RSEI toxicity weights are constructed and use in RSEI results metrics.
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Causal Analysis/Diagnosis Decision Information System (CADDIS)
The Causal Analysis/Diagnosis Decision Information System, or CADDIS, is a website developed to help scientists and engineers in the Regions, States, and Tribes conduct causal assessments in aquatic systems to determine the cause of contamination.
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Drinking Water System Operations in Wyoming and on Tribal Lands in EPA Region 8
This website is designed for the use of owners, operators, and administrative staff who work at public water supply systems in Wyoming and on Tribal lands within the jurisdiction of Region 8.
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Frequent Questions: EPA’s Greenhouse Gas Equivalencies Calculator
Answers to commonly asked questions about the Greenhouse Gas Equivalencies Calculator.
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2011 NATA: Assessment Methods
Information about assessment methods used in the 2011 NATA assessment
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Implementing EPA's Web Glossary Standard
This document supports the Web Glossary Standard which requires that all web glossaries be displayed via a link to that glossary in the EPA Terminology Services App - which is the authoritative source for EPA glossaries.
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AirToxScreen Limitations
Summary of the limitations of the AirToxScreen assessment.
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AirToxScreen Assessment Methods
Information about assessment methods used in AirToxScreen
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Trash Free Waters
Trash-Free Waters provides information about the myriad problems and solutions of pollution that get in our human-made and natural water systems.
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EPA Decision to add 14 waterbody-pollutant combinations to Florida’s 2024 Clean Water Act section 303(d) List
The EPA Region 4 is requesting public comment on its decision to add impairments to Florida’s 2024 303(d) Lists. The EPA partially approved the state’s 2024 303(d) list but determined that 14 waterbody-pollutant combinations should have been included.
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Frequently Asked Questions about Plastic Recycling and Composting
Frequently Asked Questions about Plastic Recycling, Biodegradable, and Compostable Plastics.
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Watershed Academy
The Watershed Academy is a focal point at EPA Office of Water for providing training and information on implementing watershed approaches on a wide range of watershed topics.
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Opti-Tool: EPA Region 1's Stormwater Management Optimization Tool
Opti-Tool assists stormwater managers & consulting engineers in preparing technically sound & cost-effective watershed SW mgmt plans to achieve needed pollutant & volume reductions more affordably from developed landscapes throughout the New England Region
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Region 1 Reports, Selected Regional Projects, and Fact Sheets about TMDLs and Impaired Waters
A collection of links to reports, selected regional projects and factsheets for EPA Region 1.
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WV 303(d) List Public Notice
Created draft page for WV 303(d) List Public Notice. to be edited when information becomes available.
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TMDLs at Work: Deer Creek Reservoir
The documents detail the Deer Creek Reservoir TMDL at work.