Your plant's NPDES/CDPS permit doesn't exist in isolation — it's one piece of a broader regulatory web that also governs what happens to the solids your treatment process removes and the nutrients that remain in your effluent. As a Class A operator, you're expected to see how these pieces connect and to reason through realistic, multi-part compliance situations the way the operator in responsible charge actually has to — under time pressure, with incomplete information, and with real legal consequences riding on the decision. This guide ties those threads together.
Biosolids: The NPDES Permit's Sibling Obligation
Every pound of BOD5 and TSS your plant removes to satisfy its NPDES/CDPS effluent limits doesn't disappear — it becomes solids that must themselves be treated, tested, and disposed of or beneficially reused in compliance with a separate but closely related federal regulatio