This article describes the agents participating in the process of implementing the remuneration rate due to the use of water, through negotiating the global goal of reducing the contaminating load, in the Metropolitan Area of Valle de Aburrá (2006-2011). The exploratory analysis based on the inductive method permitted analyzing a case study of implementing an instrument of contamination control in the given region. The study concludes that characteristics of each of the agents are decisive to participate in the political market of electing the global goal of reducing the contaminating load.