Las Arenitas is a remarkable artificial oasis that recycles water from Mexicali, rejuvenating ecosystems in the Colorado River delta. Situated in a parched landscape, this wetland has become a haven for endemic and migratory birds. With a history of severe pollution from untreated sewage, authorities on both sides of the US-Mexico border initiated efforts in the 1990s to address the problem. The Las Arenitas treatment plant, operational since 2007, effectively processes around 46% of Mexicali’s sewage, utilizing advanced techniques to improve water quality and restore ecological balance in the region.
Las Arenitas is transforming sewage into a vital ecosystem resource, successfully reviving the region’s environment while providing a refuge for migratory birds.
The collaboration between American and Mexican authorities on infrastructure has led to significant improvements in water quality and ecosystem health in the Colorado River delta.
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