In December 2003, the U.S. Environmental Protection Agency (EPA) published its WatershedBased National Pollutant Discharge Elimination System (NPDES) Permitting Implementation Guidance [EPA 833-B-03-004] and followed up with the Watershed-Based National Pollutant Discharge Elimination System (NPDES) Permitting Technical Guidance [EPA 833-B-07-004] in August 2007.These guidance documents consider a process for integrating the NPDES permitting program into a larger watershed management approach and coordinating NPDES activities with other water quality activities in the watershed. They describe a process of data collection and analysis conducted to support the development and issuance of NPDES permits that consider the diverse pollutant sources and stressors located within a defined geographic area (i.e., watershed boundaries). The conclusions reached through this watershed-based analytical approach lead to a broad range of possible NPDES or other program implementation options to achieve watershed goals. These options might extend beyond the traditional approach of developing and issuing a single NPDES permit to an individual point source discharger. The specific options and tools selected for the resulting NPDES watershed framework will depend on the characteristics of the watershed, the pollutants of concern, the sources of those pollutants, and the permitting context. One such tool is a watershed-based permit. Several permitting authorities have developed or considered a type of watershed-based permit, a multisource watershed-based permit, to address nutrient discharges within one or more watershed. This paper and presentation review the concepts of a watershed permitting analytical approach and an NPDES watershed framework as presented in EPA guidance. The presentation will highlight where Stakeholders are pursuing Watershed-based Permitting Approaches to control Nutrient Pollution and Storm water discharges.

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For the past several years, EPA has been developing "technical guidance" to add to the December 2003, EPA Watershed-Based National Pollutant Discharge Elimination System Permitting Implementation Guidance . This "technical guidance" expands on the information in the Implementation Guidance and also addresses many comments received during the public review phase of the Implementation Guidance. During the public review process, many commenters requested more detailed information on how to produce watershed-based permits and how to address specific situations that were considered beyond the scope of basic implementation processes. The decision was made to address these issues in future guidance and that is what is done through this new guidance.The new guidance is made up of three distinct pieces that recognize there is no one single approach. The watershed approach is characterized by the use of a dynamic process to identify and assess problems holistically and implement site-specific solutions to achieve watershed goals. Therefore, the process for integrating the NPDES permitting program into a larger watershed management system means developing and utilizing a watershed-based analytical approach to coordinate NPDES activities with other water quality activities. A watershed-based analytical approach is the groundwork data collection and analysis conducted to support the development and issuance of NPDES permits that consider the diverse pollutant sources and stressors located within a defined geographic area (i.e., watershed boundaries). The primary difference between a watershed permitting analytical approach and the more common historical approach to permitting is that the watershed permitting analytical approach considers the impact of multiple pollutant sources and stressors, including nonpoint source contributions. In contrast, the historical approach simply uses an aggregate background load. A watershed permitting analytical approach also considers watershed goals throughout the permitting process.The conclusions reached through the watershed-based analytical approach are then implemented through a broad range of possible NPDES implementation options to achieve watershed goals. These options extend beyond the traditional approach of developing and issuing a single NPDES permit to an individual point source discharger. This broader view of NPDES implementation options is referred to as the NPDES 8169 WEFTEC®.07