Frequent Questions

What are the three different Compliance Monitoring Types and their definitions?

  • Comprehensive
    These inspections are designed to comprehensively determine compliance with the NPDES regulations.  These inspections are designed to capture the most common and complete NPDES inspections.  Examples include Compliance Evaluation Inspection (CEI) and Performance Audit Inspection (PAI).
  • Industrial User (CWA NPDES only)
    These inspections apply only to the NPDES pretreatment program.  These are designed to evaluate whether NPDES control authorities are meeting their responsibilities.  Common inspections under this category include:  Evaluations, sampling, audits and toxics sampling.
  • Alternative inspections/monitoring
    These inspections are designed to capture less thorough, unique, or unusual NPDES compliance monitoring activities.
    Examples include: Reconnaissance inspections, remote sensing monitoring, and statistically valid inspections

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