This article identified and evaluated through Environmental Perception with a Geographical Approach (PAEG), the social and environmental impacts at the community level derived from the contamination present in the stream called El Riíto in Tonalá, Chiapas. For this, a mixed methodology was applied, which included from the identification of social actors, interviews and the application of structured surveys using statistical procedures in two communities on the Chiapas coast: Paredón and Tonalá. This type of research also allowed identifying weaknesses in the governance and management of the institutions present in the area, as they fail to provide a comprehensive solution to a water problem that puts the health of the two communities under study at risk, much less to the micro basin environment.

Keywords: Geographic perception, urban stream, pollution, micro basin