Municipal workers in Los Cabos extracted more than 70 tons of invasive aquatic plants from the Estero de San José del Cabo, the city government announced this week. The cleanup targeted water hyacinth and water lettuce, two species that had blanketed the surface of the federally protected wetland.
Mayor Christian Agúndez Gómez ordered the operation, which was carried out by the General Directorate of Ecology and Environment of the XV City Council of Los Cabos. Crews removed the invasive biomass from the water’s surface and surrounding areas of the estuary, located just inland from San José del Cabo’s hotel zone near Boulevard Antonio Mijares.
Why Invasive Plants Threaten the Estuary
Water hyacinth and water lettuce spread rapidly in warm, nutrient-rich water. Left unchecked, they form dense mats that block sunlight, deplete oxygen, and choke off habitat for fish and native vegetation. The estuary is home to more than 217 recorded bird species, 97 of which are migratory, along with fish, turtles, and other marine animals.
The Estero de San José del Cabo was declared a State Ecological Reserve and Natural Protected Area in 1994. It joined the international RAMSAR List of strategically important wetlands in 2009. The conservation group Pronatura Noroeste has classified it as an Important Bird Area under category G1, meaning it serves as habitat for globally threatened species, including the Belding’s Yellowthroat, which exists almost exclusively in this estuary.
City Plans Ongoing Monitoring
Beyond the plant removal, workers also collected solid waste from the site and held environmental awareness activities for community members. The city government said the operation is part of a permanent conservation program, not a one-time effort. Officials plan to establish continuous monitoring to detect new invasions of water hyacinth, water lettuce, or other problematic species before they reach critical levels.
The estuary sits where freshwater from the Sierra de la Laguna mountains meets the Sea of Cortez, creating a rare coastal freshwater oasis at the southern tip of the Baja California peninsula. Local environmental group Ángeles del Estero has long worked to protect the area from pollution and invasive species. The Puerto Los Cabos Marina development nearby has raised concerns about long-term pressure on the ecosystem.
The cleanup was first reported by the Los Cabos municipal government on its official website, loscabos.gob.mx.