Reference Library of Water Quality Standards Policy and Guidance Documents

Related Information

Refer to Water Quality Standards Handbook for comprehensive guidance and context for the documents. 

This page contains an index of specific EPA documents related to water quality standards, including those referenced in the Water Quality Standards Handbook. You can sort the index alphabetically, by publication date, or by topic.

Select on the up or down arrow in each column heading to sort the table by that column in ascending or descending order.

Topic Title Publication Date EPA Number
(if assigned)
Antidegradation Tier 2 Antidegradation Reviews and Significance Thresholds Memo (pdf) (168.09 KB) 2005/08/10  
Antidegradation Antidegradation Policy Approvals and Endangered Species Act Consultations, Memorandum from Geoffrey Grubbs (pdf) (281.14 KB) 2005/01/27  
Antidegradation Interpretation of Federal Antidegradation Regulatory Requirement, Memorandum from Tudor Davies (pdf) (446.05 KB) 1994/02/22  
Antidegradation Antidegradation Policy, Memorandum from William Diamond (pdf) (56.87 KB) 1991/06/13  
Antidegradation Application of Antidegradation Policy to the Niagara River, Memorandum from Martha Prothro (pdf) (145.46 KB) 1989/08/04  
Antidegradation EPA Designation of Outstanding National Resource Waters, Memorandum from William Diamond (pdf) (405.79 KB) 1989/05/25  
Antidegradation Antidegradation Policy, Memorandum from Martha Prothro (pdf) (291.32 KB) 1985/12/10  
Antidegradation Antidegradation Policy, Memorandum from Patrick Tobin (pdf) (82.1 KB) 1985/11/22  
Antidegradation Questions and Answers on Antidegradation (pdf) (1.03 MB) 1985/08  
Antidegradation Compendium of Department of the Interior Statements on Non-Degradation of Interstate Waters (pdf) (3.4 MB) 1968/08/01  
Antidegradation Antidegradation, Wasteloads, and Permits, Memorandum from Edwin Johnson (pdf) (79.26 KB) 1988/01/01  
Antidegradation Downgrading of Water Quality Standards (pdf) (94.27 KB) 1978/05/23  
Arsenic Arsenic Decision, Memorandum from Robert Perciasepe (pdf) (333.76 KB) 1995/02/06  
Assessment Thesaurus of Terms Used in Microbiological Risk Assessment 2007/07/01  
Assessment Consolidated Assessment and Listing Methodology: Toward a Compendium of Best Practices 2002/07/01  
Assessment Biological Methods Manual (Biological Field and Laboratory Methods for Measuring the Quality of Surface Waters and Effluents) (pdf) (8.47 MB) 1973/07/01 670-4-73-001
Assessment, Biological A Primer on Using Biological Assessments to Support Water Quality Management (pdf) (6.13 MB, October 2011, EPA 810-R-11-01) 2011/10 810-R-11-01
Assessment, chronic toxicity Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms; 4th ed. (pdf) (4.66 MB, October 2002, 821-R-02-013) 2002/10/01 821-R-02-013
Assessment, chronic toxicity Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms; 3rd ed. (pdf) (7.05 MB, October 2002, 821-R-02-014) 2002/10/01 821-R-02-014
Assessment, toxicity Methods for Measuring Acute Toxicity of Effluents to Freshwater and Marine Organism 2002/10/01 821-R-02-012
Bacteria criteria Ambient Water Quality Criteria for Bacteria (PDF) 1986/01/01 440/5-84-002
Biological criteria Biological Assessments: Key Terms and Concepts (pdf) (1.64 MB) 2011/03/01 820-F-11/006
Biological criteria Summary of Biological Assessment Programs and Biocriteria Development for States, Tribes, Territories, and Interstate Commissions: Streams and Wadeable Rivers (pdf) (27.85 MB) 2002/12/01 822-R-02-048
Biological criteria

Using Biological Data as Indicators of Water Quality (Chapter 5 of Consolidated Assessment and Listing Methodology)

Consolidated Assessment and Listing Methodology (CALM) (pdf) (1.74 MB, July 2002)

2002/07/01  
Biological criteria Stressor Identification Guidance Document (pdf) (1.92 MB, December 2000, EPA 822-B-00-025) 2000/12/01 822-B-00-005
Biological criteria Summary of State Biological Assessment Programs for Streams and Rivers (pdf) (3.04 MB) 1996/02/01 230-R-96-007
Biological criteria Final Policy Memo on Biological Assessments and Criteria (pdf) (1.1 MB) 1991/06/19  
Biological criteria National Program Guidance for Surface Waters (pdf) (1.39 MB, April 1990, EPA 440/5-90-004) 1990/04/01 440/5-90-004
Biological criteria Biological Assessments and Criteria: Crucial Components of Water Quality Programs (pdf) (933.49 KB) 2002/01/01 822-F-02-006
Biological criteria Lake and Reservoir Bioassessment and Biocriteria: Technical Guidance Document (pdf) (15.08 MB, August 1998, EPA 841-B-98-007) 1998/08/01 841-B-98-007
Biological criteria Procedures for Initiating Narrative Biological Criteria (pdf) (427.46 KB, October 1992, EPA 822-B-92-002) 1992/10 822-B-92-002
Chesapeake Bay Response to Petition from Chesapeake Bay Foundation 2005/06/13  
Conditional Approvals Guidance for the Use of Conditional Approvals for State Water Quality Standards, Memorandum from Martha Prothro (pdf) (639.82 KB) 1989/06/20  
Copper criteria Streamlined Water-Effect Ratio Procedure for Discharges of Copper (pdf) (116.26 KB) 2001/03/01 822-R-01-005
Criteria

Office of Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria (pdf) (2.69 MB, October 1, 1993)

1993/10/01  
Criteria Guidance on the Use of Criteria Contained in "Quality Criteria For Water" During the Review of State Water Quality Standards Revisions (pdf) (125.39 KB) 1978/01/16  
Criteria National Recommended Water Quality Criteria Current  
Criteria Historical Water Quality Criteria Documents     
Criteria Guidelines for Deriving Numerical National Water Quality Criteria for the Protection of Aquatic Organisms and Their Uses 1985/01/01 PB85-227049
Criteria, Hydrologic/Physical Addressing Water Quality Effects from Hydrologic Alteration and Providing Resilience to Climate Change    
CERCLA CWA/CERCLA Site Specific Sample Memorandum of Understanding 2017-11-21  
Designated Uses Designating Attainable Uses Symposium, 2002 (pdf) (279.24 KB) 2002/06/03  
Designated Uses EPA, DOI, Army Corp Federal Dams memo to Oregon (pdf) (319.76 KB, May 4, 2005) 2005/05/04  
Designated Uses Plan for Supporting States and Tribes on Designated Use Issues, 2004 (pdf) (43.73 KB, August 9, 2004) 2004/08/09  
Designated Uses-Recreation Designation of Recreation Uses (pdf) (502.73 KB) 1989/09/07  
Dissolved oxygen criteria Ambient Aquatic Life Water Quality Criteria for Dissolved Oxygen (Saltwater): Cape Cod to Cape Hatteras (pdf) (6.19 MB) 2000/11/01 822-R-00-012
Downstream Protection of Downstream Waters in Water Quality Standards    
Downstream Response to Sierra Club Petition (pdf) (684.4 KB) 2004/06/25  
Downstream Favorable Supreme Court Decision Concerning Interstate Water Pollution, Memorandum from Raymond Ludwiszewski (Arkansas v. Oklahoma) (pdf) (1.71 MB) 1992/02/27  
Downstream Templates for Narrative Downstream Protection Criteria in State Water Quality Standards 2014/02/14 820-F-14-002
Downstream

Protection of Downstream Waters in Water Quality Standards: Frequently Asked Questions (pdf) (553.37 KB)

2014/6 820-F-14-001
Downstream Decision Tree Tool for Downstream Protection 2014/11/17  
Economic Interim Economic Guidance for Water Quality Standards: Workbook 1995/03/01 823/B-95-002
Emerging contaminants Aquatic Life: Contaminants of Emerging Concern    
Endangered Species Act Consultation Memorandum of Agreement Between the Environmental Protection Agency, Fish and Wildlife Service, and National Marine Fisheries Service Regarding Enhanced Coordination Under the Clean Water Act and the Endangered Species Act; Notice 2001/02/22  
Endangered Species Act Consultation

Policy Guidance: Water Quality Standards and the Endangered Species Act (pdf) (124.91 KB)

2001/02/22 823-F-01-003 
Endangered Species Act Consultation Endangered Species Consultation Handbook (PDF) 1998/03/01  
Endangered Species Act Consultation

Appendix F: Coordination between the EPA, Fish & Wildlife Services and National Marine Fisheries Service (pdf) (780.4 KB)

1992/07/27  
Existing Uses Questions and Answers on EPA's Existing Use Policy, Letter to Mr. Derek Smithee, State of Oklahoma Water Resources Board (pdf) (2.39 MB) 2008/09/05  
Existing Uses Determination of "Existing Uses" for Purposes of Water Quality Standards Implementation (pdf) (158.27 KB)
Memorandum from Patrick Tobin		 1986/04/07  
Existing Uses Interpretation of the Term "Existing Uses" Under the Antidegradation Policy (pdf) (53.88 KB) 1985/02/21  
Fish and Shellfish Advisories Guidance: Use of Fish and Shellfish Advisories and Classifications in 303(d) and 305(b) Listing Decisions, Letter from Geoffrey Grubbs and Robert Wayland (pdf) (66.85 KB) 2000/10/24  
Fish consumption Estimated per capita fish consumption in the United States (pdf) (2.24 MB) 2002/08/01 821-C-02-003
Fish consumption EPA Guidance for Developing Fish Advisories    
Recreational Criteria Water Quality Standards for Coastal Recreation Waters: Considerations for States as They Select Appropriate Risk Levels (pdf) (30.05 KB, August 2006, EPA-823-F-06-012) 2006/08/01 823-F-06-012
Great Lakes Water Quality Guidance for the Great Lakes System: Supplementary Information Document (SID) (pdf) (39.35 MB) 1995/03/01 820-B-95-001
Groundwater Water Quality Standards and Underground Waters, Memorandum from Joan Bernstein (pdf) (423.26 KB) 1979/05/29  
Human health criteria Methodology for Deriving Ambient Water Quality Criteria for the Protection of Human Health 2000/10/01 822-B-00-004
Human health criteria Human Health Ambient Water Quality Criteria and Fish Consumption Rates Frequently Asked Questions (pdf) (714.13 KB) 2000  
Implementation Plans Revision of Water Quality Standards and Implementation Plans Under [Section] 303 of the Federal Water Pollution Control Act, Memorandum from William Frick (pdf) (692.82 KB) 1975/02/03  
Interstate Waters National Stream Use Policy, Memorandum to Acting Director, Water Planning Division (pdf) (17.88 KB) 1972/10/25  
Lagoons Lagoon Wastewater Treatment Systems - Including the Lagoon Inventory Dataset and the Universe of Lagoons Report 2022/05  
Marinas Section 401 Certification of Marinas, Memorandum from Catherine Winer (pdf) (505.68 KB) 1985/11/12  
Marine pH criteria Letter on Marine pH Criteria: EPA to Center for Biological Diversity (pdf) (246.59 KB) 2010/04/15  
Metals criteria Modifications to "Interim Guidance on Determination and Use of Water-Effect ratios for Metals" and EPA’s "Recalculation Procedure when Deriving Site-Specific Criteria" (pdf) (186.46 KB) 1997/12/03  
Metals criteria Interim Guidance on Determination and Use of Water-Effect Ratios for Metals, Memorandum from Tudor Davies (pdf) (12.18 MB) 1994/02/22 823-B-94-001
Metals criteria Office of Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria (pdf) (2.69 MB) 1993/10/01 822-F-93-009
Mixing Zones Initial Zones of Dilution for Bacteria in Rivers and Streams, Memorandum from Ephraim King (pdf) (654.19 KB) 2008/11/12  
Mixing Zones Compilation of EPA Mixing Zone Documents (pdf) (475.59 KB) 2006/07/01 823-R-06-003
Mixing Zones EPA Guidance on Application of State Mixing Zone Policies in EPA-issued NPDES Permits, Memorandum from Robert Perciasepe (pdf) (286.05 KB) 1996/08/06  
Mixing Zones Allocated Impact Zones for Areas of Non-Compliance (pdf) (2.36 MB) 1995/03 EPA 823-R-95-003
Mixing Zones Mixing Zones for Water Quality Standards, Memorandum from Richard Stoll (pdf) (264.31 KB) 1979/05/01  
Mixing Zones Decision no. 31 of the General Counsel on Matters of Law Pursuant to 40 CFR Section 125.36(m) (pdf) (374.24 KB) 1975/10/14  
Mixing Zones Mixing Zones, Memorandum from Robert Zenner (pdf) (344.75 KB) 1973/10/02  
Modeling

Appendix J: Attachments of Office to Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria (pdf) (1.4 MB)

Refer to page 18.

 1993/10/01  
Monitoring

Appendix J: Attachments of Office to Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria (pdf) (1.4 MB)

Refer to page 29.

 1993/10/01  
Monitoring State Water Monitoring and Waste Load Allocation (pdf) (3.05 MB) 1985/10/01 440/4-85-031
Narrative Translator Criteria Option 3 of Section 303(c)(2)(B) Guidance, Memorandum from David Sabock (pdf) (274.63 KB) 1990/01/03  
Natural Conditions A Framework for Defining and Documenting Natural Conditions for Development of Site-Specific Natural Background Aquatic Life Criteria for Temperature, Dissolved Oxygen, and PH: Interim Document (pdf) (854.17 KB) 2015/02/12 820-R-15-001
Natural Conditions

Establishing Site-Specific Aquatic Life Criteria Equal to Natural Background (T. Davies) (pdf) (124.67 KB, November 5, 1997)

1997/11/05  
Nonpoint Sources Nonpoint Source Pollution: Technical Guidance and Tools    
Nonpoint Sources Guidance Specifying Management Measures For Sources Of Nonpoint Pollution In Coastal Waters (pdf) (21.1 MB)

1993/01/01

 840-B-92-002
Nonpoint Sources Nonpoint Source Controls and Water Quality Standards, Memorandum from Carl Myers (pdf) (835.67 KB) 1987/08/19 FY-87-49
Nonpoint Sources Answers to Questions on Nonpoint Sources and WQS (pdf) (68.75 KB)
Memorandum from Lawrence Jensen		 1986/03/07  
Nonpoint Sources Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance (PDF)  1993/01/01 841-B-93-003
Nutrients Bioconfirmation, Letter to Maine Department of Environmental Protection (pdf) (753.82 KB) 2011/12/22  
Nutrients Response letter to the Mississippi River Petition, July 29, 2011 (pdf) (1.66 MB) 2011/07/29  
Nutrients Working in Partnership with States to Address Phosphorus and Nitrogen Pollution through Use of a Framework for State Nutrient Reductions (March 2011 EPA Memorandum) (pdf) (346.32 KB)
Working in Partnership with States to Address Phosphorus and Nitrogen Pollution through Use of a Framework for State Nutrient Reductions (March 2011 EPA Memorandum) 		2011/03/16  
Nutrients Letter to New England Interstate Water Pollution Control Commission, March 1, 2011 (pdf) (814.89 KB) 2011/03/01  
Nutrients EPA Response to the Maine Congressional Delegation’s January 21, 2011 Letter (pdf) (850.08 KB) 2011/02/15  
Nutrients

Using Stressor-Response Relationships to Derive Numeric Nutrient Criteria (pdf) (1.71 MB, November 2010, EPA 820-S-10-001)

2010/11/01 820-S-10-001
Nutrients An Urgent Call to Action: Report of the State-EPA Nutrient Innovations Task Group (August 2009) (pdf) (5.61 MB) 2009/08/27  
Nutrients EPA Needs to Accelerate Adoption of Numeric Nutrient Water Quality Standards, OIG Report 09-P-0223 (pdf) (211.56 KB) 2009/08/26 09-P-0223
Nutrients

Nutrient Criteria Technical Guidance Manual: Wetlands (pdf) (2.27 MB, June 2008, EPA 822-B-08-001)

2008/06/01 822-B-08-001
Nutrients Nutrient Pollution and Numeric Water Quality Standards (May 2007 EPA Memorandum) (pdf) (128.99 KB)
Nutrient Pollution and Numeric Water Quality Standards (May 2007 EPA Memorandum) 		2007/05/25  
Nutrients Establishing numeric nutrient criteria, Letter from Ben Grumbles to the Natural Resources Defense Council (pdf) (1.1 MB) 2004/03/05  
Nutrients

Development and Adoption of Nutrient Criteria into Water Quality Standards (November 2001 EPA Memorandum) (pdf) (74.9 KB)

2001/11/14  
Nutrients

Nutrient Criteria Technical Guidance Manual: Estuarine and Coastal Marine Waters (pdf) (6.52 MB, October 2001, EPA 822-B-01-003)

2001/10/01 822-B-01-003
Nutrients

Nutrient Criteria Technical Guidance Manual: Rivers and Streams (pdf) (2.72 MB, July 2000, EPA 822-B-00-002)

2000/07/07 822-B-00-002
Nutrients

Nutrient Criteria Technical Guidance Manual: Lakes and Reservoirs (pdf) (6.11 MB, April 2000, EPA 822-B-00-001)

2000/07/07 822-B-00-001
Nutrients

National Strategy for the Development of Regional Nutrient Criteria (pdf) (271.3 KB, June 1998, EPA 822-R-98-002)

1998/06/01 822-R-98-002
Ocean Acidification Integrated Reporting and Listing Decisions Related to Ocean Acidification, Memorandum from Denise Keehner 2010/11/15  
Public Hearing Modernizing Public Hearings for Water Quality Standard Decisions Consistent with 40 CFR 25.5 (pdf) (670.06 KB, June 2019, EPA 823-F-19-005) 2019/06/13 823-F-19-005
Recreational Criteria Recreational Water Quality Criteria and Methods 2011/12/09 820-D-11-002
Recreational Criteria Summary of Stakeholder Meeting on EPA’s Development of New or Revised Recreational Water Quality Criteria June 14–15, 2011 – New Orleans, Louisiana 2011/06/14  
Recreational Criteria Recreational Water Criteria – Critical Path Science Plan 2007/08/31 823-R-08-002
Recreational Criteria Bacteria Rule for Coastal and Great Lakes Recreation Waters (BEACH Act rule) 2004/11/16  
Recreational Criteria Beaches Environmental Assessment and Coastal Health Act of 2000 2000/01/24 PUBLIC LAW 106–284
Reporting Watershed Monitoring and Reporting Requirements for Section 319 National Monitoring Program Projects (pdf) (7.18 MB) 1991/08/30 843-B-91-113
Reporting

Integrated Reporting Memoranda under CWA Sections 303(d), 305(b) and 314

    
Seaward Extent of State WQS Seaward Extent of State Water Quality Standards, Memorandum from Cathy Winer (pdf) (392.15 KB) 1985/10/31  
Sediment Promoting Water, Superfund and Enforcement Collaboration on Contaminated Sediments (pdf) (660.61 KB) 2015/02/12  
Sediment EPA's Contaminated Sediment Management Strategy (pdf) (8.42 MB) 1998/04/01 823-R-98-001
Sediment criteria Procedures for the Derivation of Equilibrium Partitioning Sediment Benchmarks (ESBs) for the Protection of Benthic Organisms: PAH Mixtures (pdf) (1.65 MB) 2003/11 EPA 600-R-02-013
Site-specific criteria Establishing Site-Specific Aquatic Life Criteria Equal to Natural Background (T. Davies) (pdf) (124.67 KB, November 5, 1997)
Establishing Site-Specific Aquatic Life Criteria Equal to Natural Background (T. Davies) 		1997/11/05  
Site-specific criteria Guidelines for Deriving Numerical Aquatic Site-Specific Water Quality Criteria by Modifying National Criteria (pdf) (95.65 KB) 1984/12/01 600-S3-84-099
Standards, General Strategy for Water Quality Standards and Criteria (pdf) (1.17 MB) 2003/08/03 823-R-03-010
Standards, General Fact Sheet: Strategy for Water Quality Standards and Criteria: Setting Priorities to Strengthen the Foundation for Protecting and Restoring the Nation's Waters (pdf) (35.54 KB) 2003/08/03 823-F-03-011
Standards, General Memo from Geoff Grubbs: Questions and Answers on EPA’s “Alaska Rule” (pdf) (183.46 KB, 9/15/2000) 2000/09/15  
Standards, General Water Quality Standards Review and Revision - Robert W. Fri Memo (pdf) (78.92 KB, November 8, 1972) 1972/11/08  
Standards, General

Guidelines for Developing or Revising Water Quality Standards (pdf) (1.76 MB, January 1973)

NOTE: This document is provided for historical purposes only. Refer to the online Water Quality Standards Handbook for the latest program guidance.

 1973/01/00  
Standards, General

Guidelines for Developing or Revising Water Quality Standards - Amended April 1973 (pdf) (1.34 MB, April 1973)

NOTE: This document is provided for historical purposes only. Refer to the online Water Quality Standards Handbook for the latest program guidance.

 1973/04/00 800R73101
Standards, General Advanced Notice of Proposed Rulemaking for Water Quality Standards 1998/07/07 Federal Register Vol. 63, No.129 Pages 36741-36806
Standards, General Priorities for Water Quality Criteria and Standards Programs FY 2017-2018 2016/04/08  
Standards, General Water Quality Criteria and Standards Plan: Priorities for the Future (pdf) (529.67 KB) 1998/06/01 822-R-98-003
Standards, General Water Quality Standards for the 21st Century: Proceedings of the Fourth National Conference (pdf) (30.34 MB) , September 13-15, 1994 1994/09/01 820-R-95-001
Standards, General Water Quality Standards for the 21st Century: Proceedings of the Third National Conference (pdf) (22.1 MB) , August 31-September 3, 1992 1992/12/01 823-R-92-009
Standards, General Water Quality Standards, Memorandum from Jack Raven (pdf) (105.58 KB) 1984/02/02  
Standards, General NOTE: This document is not the current version and is provided for historical purposes only. Refer to the online Water Quality Standards Handbook for the latest version. 1994/08 823-B-94-005a
Standards, General Rescission of Memorandum Entitled: “Policy for the EPA's Review and Action on Clean Water Act Program Submittals” 2022/02/04  
Submitting new or revised water quality standards to EPA Information for States and Tribes on submittal of new and/or revised water quality standards to U.S. EPA for review under section 303(c) of the Clean Water Act and Federal regulations at 40 CFR 131 (pdf) (31.6 KB) 2007/09/13  
TMDL Guidance for Water Quality-based Decisions: The TMDL Process (pdf) (4.61 MB) 1991/04/01 440/4-91-001
Toxic criteria Guidance for State Implementation of Water Quality Standards for CWA Section 303(C)(2)(B) (pdf) (1.01 MB) 1991/03/01 823-R-88-100
Toxic criteria Memorandum from LaJuana Wilcher Announcing Development of Federal Rulemaking to Promulgate State Water Quality Standards (National Toxics Rule) (pdf) (425.88 KB) 1990/01/26  
Toxic criteria Compliance with CWA Section 303(c)(2)(B), Memorandum from Martha Prothro (pdf) (333.82 KB) 1989/06/19  
Toxic criteria Guidance for State Implementation of Water Quality Standards for CWA Section 303(c)(2)(B), Memorandum from Rebecca Hanmer (pdf) (1.42 MB) 1988/12/12 823-R-88-100
Toxic criteria Selection of Water Quality Criteria in State Water Quality Standards, Memorandum from Edwin Johnson (pdf) (592.27 KB) 1985/02/28  
Toxic criteria Recalculation of State Toxic Criteria from October 1, 1982 (pdf) (7.49 MB) 1982/10/01  
Toxic criteria Toxic Criteria Recommendations, Memorandum from Joseph Krivak re. November 28, 1980 (pdf) (285.48 KB) 1981/08/28  
Tribes Strategy for Reviewing Tribal Eligibility Applications to Administer EPA Regulatory Programs (Strategy for Treatment in a Similar Manner to a State) (pdf) (533.56 KB) 2008/01/23  
Tribes Tribal Grants under Section 106 of the Clean Water Act    
Tribes OST Expectations for Water Quality Standards for Indian Reservations for Tribes Treated as States, Memorandum from Tudor Davies (pdf) (447.73 KB) 1992/04/20  
Tribes Revised Interpretation of the Clean Water Act Tribal Provision    
Tribes Guidance on Water Quality Standards and 401 Certification Programs Administered by Indian Tribes, Memorandum from Tudor Davies (pdf) (561.88 KB) 1991/12/31  
Tribes Final WQS Regulation Amendment Concerning Indian Tribes, Memorandum from Tudor Davies (pdf) (293.53 KB) 1991/12/05  
Tribes Reference Guide to Water Quality Standards for Indian Tribes (pdf) (2.64 MB) 1990/01/02 440/5-90-002
Triennial Review Guidance: Coordinating CSO Long-Term Planning with Water Quality Standards Review (pdf) (485.75 KB, July 31, 2001, EPA-R-01-002) 2001/07/31 833-R-01-002
Triennial Review Three-Year Quality Standards Review, Memorandum from Patrick Tobin (pdf) (250.55 KB) 1983/09/06  
Use Attainability Analysis Improving the Effectiveness of the Use Attainability Analysis Process, Memorandum from Ephraim King (pdf) (383.25 KB, March 13, 2006) 2006/03/13  
Use Attainability Analysis UAAs and Other Tools for Managing Designated Uses (pdf) (9.55 MB)
Please note that the purpose of this document is to provide examples of UAAs that states have conducted. States may conduct UAAs and then choose not to finalize the use change. For example, MD never adopted a final use change for the Patapsco River following the UAA described on pg. 38 of the document.		 2006/03/01 821-R-07-001
Use Attainability Analysis Water Quality Standards: Examples of Alternatives to Changing Long-term Designated Uses to Achieve Water Quality Goals (pdf) (824.22 KB, March 2005) 2005/03/01  
Use Attainability Analysis Technical Support Manual: Waterbody Surveys and Assessments for Conducting Use Attainability Analyses (pdf) (19.63 MB, November 1983) 1983/11 440/4-86-037
440/4-86-038
440/4-86-039
Use Attainment

Framework for Incorporating Community Preferences in Use Attainment and Related Water Quality Decision-Making

 2011/02/01 625-R-08-001F
Variances Checklist For Evaluating State Submission Of Discharger-Specific Water Quality Standards Variances (pdf) (62.31 KB) 2016/02/29  
Combined Sewer Overflows (CSO) CSO Temporal Recreational Uses or WQS variances based on 40 CFR 131.10(g)(3), Memorandum from Deborah G. Nagle (pdf) (419.99 KB, 1/19/2024) 2024/01/19  
Variances Request for Views on Allowable Duration of Water Quality Standards Variances, Memorandum from Catherine Winer (pdf) (445.18 KB) 1992/01/24  
Variances National Assessment of State Variance Procedures: Report (pdf) (2.67 MB) 1990/11/01  
Variances Variances in Water Quality Standards, Memorandum from Edwin Johnson (pdf) (13.08 KB) 1985/03/15  
Variances Applicability of the Part 25 "Public Participation" Regulations to the Approval of Variances from Water Quality Standards, Memorandum from Michele Corash (pdf) (247.87 KB) 1980/09/04  
Variances Water Quality Standards Variance Building Tool 2017/08/23  
Variances Decision no. 58 of the General Counsel on Matters of Law Pursuant to 40 CFR Section 125.36(m) (pdf) (533.31 KB) 1977/03/29  
Variances Decision no. 44 of the General Counsel on Matters of Law Pursuant to 40 CFR Section 125.35(m) (pdf) (337.57 KB) 1976/06/22  
Variances and Downgrades Definitions of WQS Terms, Memorandum from Kenneth Mackenthun (pdf) (78.32 KB) 1979/07/03  
Variances for Multiple Dischargers

Developing Credible Rationales for Variances that Apply to Multiple Dischargers - Frequently Asked Questions (pdf) (437.64 KB)

2013/03/29 820-F-13-012
Hydrologic Alteration, Water Quality 1987 and 1978 EPA Clarification of the Wallop Amendment - CWA Section 101(g) (pdf) (142.04 KB) 1987/01/08  
Hydrologic Alteration, Water Quality Guidance for 2006 Assessment, Listing and Reporting Requirements Pursuant to Sections 303(d), 305(b) and 314 of the Clean Water Act

Which segments should states include in Category 4C? (page 56)		 2005/07/29  
Hydrologic Alteration, Water Quality Consolidated Assessment and Listing Methodology: Toward a Compendium of Best Practices

How Are Habitat Data Used Within the Context of the States’ Water Quality Standards? (page 8-2)		 2002/07  

Hydrologic Alteration, Water Quality

Biological Criteria

 Memo to Federal Energy Regulatory Commission (FERC): Application of Clean Water Act Section 401 State Water Quality Certification to FERC Licenses (pdf) (230.3 KB) 1991/01/18  
Waters of the US Clean Water Act Programs Utilizing the Definition of WOTUS Current  
Wetlands Appendix E: An Approach for Evaluating Numeric Water Quality Criteria for Wetlands Protection (pdf) (2.82 MB) 1991/07/08  
Wetlands

Appendix D: National Guidance: Water Quality Standards for Wetlands (pdf) (4.41 MB)

1990/07/01 440-S-90-011
Wetlands Wetlands and 401 Certification: Opportunities for States and Eligible Indian Tribes (pdf) (3.52 MB) 1989/04/01  
Wetlands Clean Water Act Authority Over Wetlands, Memorandum from Cathy Winer (pdf) (276.05 KB) 1985/04/19  
Wetlands An Approach for Evaluating Numeric Water Quality Criteria for Wetlands Protection (pdf) (1.8 MB) 1991/07/08  
Wetlands Templates for Developing Wetland Water Quality Standards 2016/05/12  
Endangered Species Act Consultation Transmittal of Recommended Approaches to Improve Endangered Species Act (ESA) Consultations on Approvals of State & Tribal Water Quality Standards (Memo from Benjamin Grumbles) (pdf) (671.08 KB, January 16, 2009) 2009/01/16  
What is a New or Revised WQS What is a New or Revised Water Quality Standard Under CWA 303(c)(3)? - Frequently Asked Questions (pdf) (108.04 KB) 2012/10/09 820-F-12-017
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Last updated on April 17, 2025