NPDES Permit Basics
Reading and interpreting the structure of a discharge permit — limits, monitoring frequency, and reporting deadlines.
A typical NPDES permit specifies numeric effluent limits (concentration and/or mass), required monitoring frequency, and DMR (Discharge Monitoring Report) submission deadlines.
Know the difference between a daily maximum, weekly average, and monthly average limit — violating any one is treated as a separate reportable exceedance.
Permits are typically issued on a 5-year cycle; understand the renewal application timeline requirement, since late renewal applications can jeopardize continued permit coverage.
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