When a disinfection system drifts out of compliance, the clock on your regulatory reporting obligation starts immediately — often before you've even finished diagnosing the cause. This guide covers how effluent disinfection requirements actually get written into an NPDES/CDPS permit and reported when something goes wrong, and then works through the advanced diagnostic reasoning a Class A operator is expected to bring to chlorination, dechlorination, UV, and ozone system upsets.
How NPDES/CDPS Permits Set Disinfection Requirements
A facility's discharge permit — issued under the federal NPDES program and administered in Colorado through the CDPS program by CDPHE's Water Quality Control Division — sets effluent disinfection requirements as specific numeric limits, generally structured as:
- Indicator organism limits — fecal coliform and/or E. coli, typically expressed as both a *