The main purpose of this legislation, known as the "Reducing Permitting Uncertainty Act," is to clarify and streamline the process for permitting disposal sites for dredged or fill material under the Federal Water Pollution Control Act. The goal is to reduce delays and uncertainties that applicants face when trying to obtain permits for these activities. Key provisions of the legislation include a specific timeframe during which the Environmental Protection Agency (EPA) can prohibit certain areas from being designated as disposal sites.