Human-induced eutrophication, or nutrient overenrichment, is a rapidly growing environmental crisis in freshwater and marine systems worldwide. Nutrients that cause eutrophication include nitrogen and phosphorus.
Water quality trading is gaining traction in a number of watersheds around the world. It is a market-based approach that works alongside water quality regulation to improve water quality, providing flexibility in how regulations are met and potentially lowering regulatory compliance and abatement costs. The research identified 57 water quality trading programs worldwide.