Tennessee Wastewater Operator Practice Exam

How many days prior to the expiration date must an NPDES permit application be submitted?

1. 90 days

2. 120 days

3. 150 days

4. 180 days

The correct answer is: 180 days

An NPDES (National Pollutant Discharge Elimination System) permit application must be submitted at least 180 days prior to the expiration date of the current permit. This advance submission ensures that there is sufficient time for the review and approval process, which can be lengthy and complex. It allows for addressing any potential issues, public notices, and ensuring compliance with regulatory requirements before the existing permit expires. Meeting this timeline is crucial for avoiding any lapse in permit coverage, which could lead to legal repercussions for unauthorized discharges. The specified timeframe highlights the importance of planning ahead in the regulatory process to maintain environmental protections and operational continuity.