Water: Water Quality Standards Academy
Basic Course: Supplemental Topics (NPDES Permit 6)
Course Navigation
- Listing Impaired Waters and Developing TMDLs
- Monitoring & Assessment
- NPDES Permit Program
- Point Source Control
- Permitting Authority
- Types of Permits
- Categories of Permits
- Permit Components
- Key Considerations
- Technology-Based Determination
- Water Quality-Based Determination
- WQBELs Process
- Step 1: Identify WQSs
- Step 2: Assess Concentration
- Pollutants of Concern
- Dilution/Mixing
- Critical Conditions
- Dilution/Mixing Allowance
- Step 3: Establish Need
- Step 4: Calculate Limits
- Summary
- Quiz
- Human Health Ambient Water Quality Criteria
- Aquatic Life Criteria
NPDES Permit Document: Components
While EPA Regions and States may use differing formats, an NPDES permit generally includes the components presented in the graphic below. The same components are included regardless of whether it is an individual or a general permit.

Disclaimer: This online course presentation and any associated links have been prepared by EPA staff for informational purposes only. Their sole purpose is to make available training online from recent Water Quality Standards Academy classroom courses. As such, this online course and any associated links are not binding on EPA or the public and have no legal effect. They do not constitute an EPA statute, regulation or other requirement and do not substitute for such authorities. In addition, the course and any associated links have not been reviewed or endorsed by EPA management. Thus, they are not intended or written as official statements of EPA’s scientific views, policies, guidance, or requirements and cannot be used or cited as evidence of EPA’s position on any matter.
