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National Summary
Stormwater runoff is generated when precipitation from rain and snowmelt events flows over land or impervious surfaces and does not percolate into the ground. Such runoff accumulates debris, chemicals, sediment, and other pollutants and is a major source of pollution that damages rivers, lakes, streams, and coastal waters of the United States. To address this problem, the U.S. Environmental Protection Agency (EPA) has developed a federal program under the Clean Water Act's (CWA) National Pollutant Discharge Elimination System (NPDES) program to regulate stormwater discharge sources. The CWA prohibits any person from discharging pollutants into a waterway from a point source unless a permit issued either by the EPA or an authorized state agency authorizes the discharge.
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Effluent Limitations
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Stormwater-Construction Activities
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Guidance Documents
2007 Memorandum: Using Green Infrastructure to Protect Water Quality in Stormwater, CSO, Nonpoint Source and Other Water Programs
National
Guidance Documents
2010 Memorandum: Revisions to the November 22, 2002 Memorandum - Establishing TMDL Wasteload Allocation for Stormwater Sources and NPDES Permitting Requirements for Those WLAs
National
Final Regulations
40 CFR 122 - Stormwater Discharges From Logging Roads
12/07/2012
National
Proposed Regulations
40 CFR 122 - Notice of Proposed Revisions to Stormwater Regulations To Clarify That an NPDES Permit Is Not Required for Stormwater Discharges From Logging Roads
09/04/2012
National
Questions & Answers
Are facilities required to conduct monitoring under USEPA's general permit?
12/07/1999
National
Questions & Answers
Are the 2003 stormwater rules retroactive? I have a several trucking terminals that discharge from pavement through storm drains to streams with no permits. Are we in/out of compliance?
11/24/2003
National
Guidance Documents
Community Solutions for Stormwater Management: A Guide for Voluntary Long-Term Planning
National
Questions & Answers
Do I have flexibility in preparing the storm water pollution prevention plan (SWPPP) and selecting best management practices (BMPs) for my site?
12/07/1999
National
Questions & Answers
Do I need a NPDES permit if my stormwater exposure is only in the parking lot?
12/06/2004
National
Questions & Answers
Do storm water discharges from non-industrial areas (such as employee parking lots) at an industrial facility have to be addressed in the NPDES permit?
12/07/1999
National
Guidance Documents
Establishing TMDL Waste Load Allocations (WLA) for Stormwater Sources and NPDES Permitting Requirements for Those WLAs
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 1: General Accountability Considerations for Green Infrastructure
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 2: Combined Sewer Overflows
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 3: Sanitary Sewer Overflows
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 4: Stormwater
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 5: Total Maximum Daily Loads (TMDLs)
National
Guidance Documents
Green Infrastructure Permitting and Enforcement Series Factsheet 6: Water Quality Standards
National
Questions & Answers
How do I know which permit conditions apply to me?
12/07/1999
National
Questions & Answers
How many Notices of Intent (NOIs) must I submit? Where and when are they sent?
12/07/1999
National
Questions & Answers
If a project will not be completed before this permit expires, how can I keep permit coverage?
12/07/1999
National
Questions & Answers
Is the SWPPP the same as an SPCC plan?
12/07/1999
National
Questions & Answers
Must every permittee have a separate SWPPP, or is a joint plan allowed?
12/07/1999
National
Questions & Answers
My project will disturb less than 5 acres, but it may be part of a "larger common plan of development or sale." How can I tell what applies to me and what must I do?
12/07/1999
National
Questions & Answers
My question has to do with discharge of steam condensate and SWPPP.
05/17/2004
National
Calculators
National Stormwater Calculator
National
Notices
Notice of corrections to the 2012 Construction General Permit
08/07/2012
National
Forms
NPDES Applications and Forms
National
Regulatory Analysis
Stormwater - General
National
Checklists
Stormwater Sampling Kit Inspection Checklist
National
Guidance Documents
Stormwater Wet Pond and Wetland Management Guidebook
National
Guidance Documents
Technical Guidance on Implementation of the Stormwater Runoff Requirements for Federal Projects under Section 438 of the Energy Independence and Security Act
National
Questions & Answers
Throughout our construction project, we have amended our SWPPP several times. What are our obligations now that we have altered our SWPPP?
11/02/2016
National
Questions & Answers
We recently purchased an existing building, but renovations need to be completed prior to moving into the building. What types of indoor/outdoor activities would trigger the need for a permit?
10/28/2016
National
On-Demand Webinars
Webinar (2015-04): Emerging Industrial Stormwater General Permit Requirements: Practical Strategies for Meeting Increased Compliance Demands
National
On-Demand Webinars
Webinar (2016-03): Stormwater Management for Changing Weather: Learn the Top Compliance Strategies for Confronting Seasonal and Episodic Weather Events
National
Speaker's Notes
Webinar (2017-11): Stormwater Management Programs: How to Integrate New Technologies to Improve Processes and Operations
National
On-Demand Webinars
Webinar (2017-11): Stormwater Management Programs: How to Integrate New Technologies to Improve Processes and Operations
National
Speaker's Notes
Webinar [2019-01]: Stormwater Management: Solving BMP Maintenance Challenges in the Private Sector
National
On-Demand Webinars
Webinar [2019-01]: Stormwater Management: Solving BMP Maintenance Challenges in the Private Sector
National
Speaker's Notes
Webinar [2021-06]: Preventing Spills: Best Management Practices and Stormwater Control
National
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