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NPDES
National Summary
The National Pollutant Discharge Elimination System (NPDES) permit program was established under the Clean Water Act (CWA) and regulates discharges of pollutants from point sources (pipe, ditch, well, etc.) to U.S. waters. Under NPDES, all facilities that discharge pollutants from any point source into waters of the United States are required to obtain a permit. The permit provides two levels of control: technology-based limits (based on the ability of dischargers in the same industrial category to treat wastewater) and water-quality-based limits (if technology-based limits are not sufficient to provide protection of the water body).
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Proposed Regulations 40 CFR Parts 122,123,127, et al. - NPDES Electronic Reporting Rule; Proposed Rule 07/30/2013National
Final Regulations 40 CFR 112 - Definitions 05/25/2021National
Final Regulations 40 CFR 122 - National Pollutant Discharge Elimination System Regulation Revision: Removal of the Pesticide Discharge Permitting Exemption in Response to Sixth Circuit Court of Appeals Decision 06/27/2013National
Final Regulations 40 CFR 122 -- National Pollutant Discharge Elimination System Permit Regulation for Concentrated Animal Feeding Operations: Removal of Vacated Elements in Response to 2011 Court Decision 07/30/2012National
Final Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification 12/02/2022National
Proposed Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification 12/02/2022National
Final Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification 06/12/2023National
Final Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification; Extension of Comment Period 12/29/2022National
Proposed Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification; Extension of Comment Period 12/29/2022National
Final Regulations 40 CFR 122 and 123 - NPDES Small MS4 Urbanized Area Clarification; Withdrawal of Direct Final Rule 02/22/2023National
Final Regulations 40 CFR 127 - Updates to NPDES eRule Data Elements To Reflect MS4 General Permit Remand Rule 04/15/2020National
Proposed Regulations 40 CFR 136 - Clean Water Act Methods Update Rule for the Analysis of Effluent; Proposed Rule 02/21/2023National
Proposed Regulations 40 CFR 139 - Vessel Incidental Discharge National Standards of Performance 10/18/2023National
Proposed Regulations 40 CFR 1700 - Uniform National Discharge Standards for Vessels of the Armed Forces--Phase II 02/03/2014National
Proposed Regulations 40 CFR 9 and 122 - Concentrated Animal Feeding Operation (CAFO) Reporting Rule 07/20/2012National
Final Regulations 40 CFR 9, 122, 123, 127, 403, and 503 - NPDES Electronic Reporting Rule--Phase 2 Extension 11/02/2020National
Proposed Regulations 40 CFR 9, 122, 123, 127, 403, and 503 - NPDES Electronic Reporting Rule–Phase 2 Extension 02/28/2020National
Proposed Regulations 40 CFR 9, 63, 80, 85, 122, 123, and 412 - Section 610 Review of NPDES Permit Regulation and Effluent Limitations Guidelines Standards for Concentrated Animal Feeding Operations; Extension of Comment Period 01/03/2013National
Proposed Regulations 40 CFR Parts 122, 123, 127, 403, 501, and 503: Extension of Comment Period for the NPDES Electronic Reporting Rule 10/29/2013National
Final Regulations 40 CFR Parts 122, 124 and 125 -National Pollutant Discharge Elimination System (NPDES): Applications and Program Updates 02/12/2019National
Notices Approval of Application To Administer Partial National Pollutant Discharge Elimination Program; Oklahoma 01/04/2013National
Checklists CAFO Inspection Preparedness Best Practices Checklist  National
Notices Cross-Media Electronic Reporting: Authorized Program Revision Approval, State of California 07/02/2014National
Notices Cross-Media Electronic Reporting: Authorized Program Revision Approval; Rhode Island 03/03/2014National
Guidance Documents EPA Fact Sheet: Livestock and Poultry Operation NPDES Inspections  National
Notices EPA Notice of Comment Request on Proposed Submittal of Information Collection Request, "Cooling Water Intake Structures at Existing Facilities (Final Rule)" 05/28/2014National
Notices Final Issuance of General NPDES Permits (GP) for Small Suction Dredges in Idaho 04/04/2013National
Notices Final Modification of the National Pollutant Discharge Elimination System General Permit for Small Suction Dredges in Idaho 03/14/2014National
Notices Final NPDES General Permit for Discharges From the Oil and Gas Extraction Point Source Category to Coastal Waters in Texas 08/08/2012National
Notices Final NPDES General Permit for Discharges Incidental to the Normal Operation of a Vessel 04/12/2013National
Notices Final Reissuance of NPDES General Permit for Concentrated Animal Feeding Operations in Idaho (IDG010000) 05/13/2020National
Notices General NPDES Permit for O&G Exploration Facilities in the Federal Waters of Cook Inlet 03/22/2013National
Notices General Permit for Oil and Gas Geotechnical Surveying and Related Activities in Federal Waters of the Beaufort and Chukchi Seas 11/22/2013National
Notices General Permits for O&G Exploration Facilities in the Chukchi Sea, AK 10/29/2012National
Questions & Answers How do NPDES permits protect water? 12/07/1999National
Questions & Answers I have a small electroplating operation that discharges to a POTW and is subject to the metal finishing regulations. However, the state regulators are applying effluent criteria for metal finishing to my NPDES discharges. Why is that happening? 12/07/1999National
Questions & Answers I have blowdown from my cooling tower and boiler discharging to the storm drain. How is this regulated? 12/07/1999National
Questions & Answers I have several different discharges from my site, each of which discharges on a different schedule. The water entering the discharge pipe may be composed of a widely different mix of contaminants. How is this type of discharge regulated? 12/07/1999National
Questions & Answers If a CAFO does not discharge or propose to discharge, which, if any, parts of the CAFO regulations apply to it? 03/05/2008National
Questions & Answers Is it legal to discharge wastewater through a pipe into my local receiving water (e.g., lake, stream, river, wetland)? 12/07/1999National