A binational river committee has condemned US federal agency detonations on Cerro Cuchumá near Tecate, warning that the blasts are damaging archaeological sites, destroying wildlife habitat, and threatening the transborder aquifer that supplies drinking water to Tecate, Tijuana, and San Diego. The Comité Especial del Río Tecate issued a formal position statement on April 10, 2026, demanding an immediate halt to all construction until binational coordination is established.
The committee includes officials from SEMARNAT (Mexico’s federal environmental ministry), CONAGUA (Mexico’s national water commission), the Baja California state environmental agency, business representatives, and civil organizations. Its statement calls the damage “significant and potentially irreversible.”
Cerro Cuchumá Explosions Damage a Sacred Kumiai Mountain and Key Aquifer Zone
Cerro Cuchumá straddles the border east of the Tecate port of entry. The mountain is sacred to the Kumiai, one of the Indigenous peoples of northern Baja California whose presence in the region predates European contact by thousands of years. For the Kumiai, Cuchumá is a ceremonial and spiritual site tied to their identity as a people.
The mountain also sits within a 510-hectare conservation zone of chaparral and rocky terrain. Biologists have documented at least 58 bird species on the mountain itself and over 120 in the surrounding area. These include raptors, hummingbirds, woodpeckers, hawks, owls, and swallows, both resident and migratory species protected under binational conservation programs.
The detonations appear linked to US border infrastructure work, though the committee’s statement does not name a specific federal agency. Tecate residents began sharing videos of the blasts on social media over the weekend of April 5-6. In those posts, residents called on authorities on both sides of the border to intervene, describing the mountain as “a territory of high environmental, cultural, and historical value.”
The committee’s primary concern centers on water. Cerro Cuchumá’s underground springs and drainage channels feed the aquifers that supply Tecate’s municipal water system. The Tecate River watershed is a binational system: water that recharges on the mountain’s slopes flows into aquifers shared by communities on both sides of the border, including parts of greater Tijuana and San Diego County.
When vegetation is stripped and soil is blasted apart, rainwater runs off the surface instead of soaking into the ground. That kills the recharge cycle. The committee warns that the removal of plant cover and the use of heavy machinery and explosives “drastically modify the hydrological cycle,” cutting off the natural filtration that feeds the aquifer below.
Landslide Risk Rises Before Tecate’s Rainy Season
Beyond the aquifer damage, destabilized slopes create an immediate physical danger. Tecate’s rainy season typically runs from November through March, but late-season storms can hit into April and May. The committee warns that blasting on already erosion-prone hillsides will produce “massive increases in sediment” during rains, raising the risk of landslides and flash flooding for nearby neighborhoods.
The committee also flags the installation of physical barriers, likely border wall segments, in areas where stream channels and wetlands cross the border. These barriers degrade the ecosystem’s ability to filter and regulate water flow into the Tecate River, according to the statement. Over time, that degradation will raise the cost of water treatment and management for both Mexico and the United States.
Tecate’s water supply is already strained. The city of roughly 110,000 people depends on a combination of local wells and water imported via aqueduct. Any reduction in local aquifer recharge pushes the city toward greater dependence on outside sources, at higher cost and lower reliability.
Committee Demands Binational Coordination Before Any Further Work
The committee’s statement makes three explicit demands. First, it calls for “transparency and respect for local and environmental sovereignty.” Second, it demands a full stop to any construction that compromises water security or slope stability until effective binational coordination is in place. Third, it insists on compliance with Mexican environmental and water laws governing the Tecate River watershed.
Mexico and the United States share a legal framework for managing border water resources through the International Boundary and Water Commission, or IBWC, established by treaty in 1944. That framework obligates both countries to consult on activities that affect shared watersheds. The committee’s demand for binational coordination suggests no such consultation took place before the blasting began.
The committee has not announced a timeline for follow-up action. Tecate residents who posted videos of the detonations have called for a formal environmental impact assessment before any work resumes. The story was first reported by Punto Norte on April 10, 2026.