The purpose of this legislative text is to amend the Federal Water Pollution Control Act, specifically focusing on the terms for permits related to water pollution discharges. The main objective is to establish clearer guidelines for how long these permits can last, which is important for managing water quality and pollution control effectively. Key provisions of this amendment include setting specific time limits for permits issued under the National Pollutant Discharge Elimination System (NPDES). For permits issued to states or municipalities, the maximum duration is set at 10 years.