Learn the Issues
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Frequently Asked Questions for Control Authorities on the Dental Rule (40 CFR Part 441)
This document clarifies implementation questions for control authorities on the dental office rule.
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Best Practices for NPDES Permit Writers and Pretreatment Coordinators to Address Toxic and Hazardous Chemical Discharges to POTWs
This guidance generally describes measures (“best practices”) NPDES permit writers and pretreatment coordinators should consider adopting to address hazardous and toxic chemical discharges to POTWs.
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Applicability of Federal Categorical Pretreatment Standards to Arias Research Associates, Inc.
Letter on determination from EPA Region 9 on the applicability of categorical pretreatment standards to Arias Research Associates on the basis of research and development (R&D) activities.
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Municipal Sources Resources
Information regarding permits, fees, funding, and guidance for municipalities interested in stormwater regulations and programs.
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Pretreatment Program Factsheet: Hazardous Waste Reporting Requirements for Industrial Users
This factsheet can be used by POTWs to inform their industrial users about hazardous waste reporting requirements in accordance with pretreatment regulations.
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NPDES WET Video Training Guide Documents
A collection of NPDES WET Video Training Guide documents.
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2004 NPDES CSO Report to Congress
This report, delivered to Congress on Thursday, August 26, 2004, presents a comprehensive characterization of CSOs and SSOs, including the extent of environmental and human health impacts caused by CSOs and SSOs.
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Stormwater Discharges from Transportation Sources
Transportation authorities manage the runoff on street, road, and highways that has polluted by cars, trucks, buses, and other vehicles.
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National Pretreatment Program Hauled Waste
Overview of regulations and guidance for the hauling and removal of transported hazardous (hauled) waste.
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NPDES Stormwater Rules and Notices
List of stormwater rules and notices documents.
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EPA's 2012 Construction General Permit (CGP) and Related Documents
List of documents for construction general permits.
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NPDES Water-Quality Based Permit Limits for Recreational Water Quality Criteria
This set of Frequently Asked Questions (FAQ) provides an overview of NPDES permittingapplicable to continuous dischargers.
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Peak Flows at Sewage Treatment Plants
In April 2018, EPA announced a new rulemaking to look at issues associated with the management and treatment of peak flows during wet weather events at publicly owned treatment works (POTWs) with separate sanitary sewer systems.
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Water Quality Trading on a Watershed Scale
This paper describes three factors that water quality trading program managers may want to consider when evaluating the appropriate scale for a trading area
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NPDES Regulations
NPDES regulatory documents, fact sheets, and federal registry.
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Water Pollution Control (Section 106) Grants
The Water Pollution Control (Section 106) Grants website provides grant recipients, and those interested in receiving such grants, information, resources, and guidance for the grant program.
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Tribal Clean Water Act Programs and Grants in EPA's Pacific Southwest (Region 9)
EPA's Tribal Water Office in Region 9 manages all grants related to the Clean Water Act for over 100 federally recognized Tribes and provides programmatic and technical assistance for water quality standards and CWA grant programs.
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Clean Water State Revolving Fund (CWSRF)
How the Clean Water State Revolving Fund works, how to obtain funding, program eligibility, innovative ways to use the funds to get the greatest water quality benefits and leverage financial resources of the program, and share success stories.