The Tijuana Rivers courses through the City of Tijuana Mexico where 2 million people live. Several hundred thousand homes in Tijuana are not connected to the city sewage system and this leads to significant pollution of the Tijuana River. And because the city of Tijuana butts right up to the US Mexico border, the path of the river sewage and the responsibility for managing is not always clear. This episode goes into Tijuana to learn more about why the pollution exists, where it comes from and the status of various infrastructure tools that manage the pollution.