Virginia established a nutrient trading program and watershed permit in 2005 to help meet Chesapeake Bay nutrient reduction goals cost effectively. The program allows point sources to purchase credits from other point sources or nonpoint nutrient reduction projects. A 2012 law expanded the program by establishing a framework for certifying and using credits from additional nonpoint source practices. Key aspects include establishing baselines, only allowing use of certified credits listed in a public registry, and requiring local water quality protections are not contravened. The program aims to facilitate cost-effective reductions while maintaining regulatory oversight and permanent water quality benefits.