Mystery Foam Engulfs Mexican City Streets After Wastewater System Failure

NAUCALPAN DE JUÁREZ, MEXICO – On June 23, 2025, the streets of Naucalpan de Juárez were engulfed by a thick, white foam, creating an unusual and concerning scene for residents. The phenomenon is attributed to the overflow of the Hondo river and Los Cuartos dam, which led to a malfunction in the local wastewater treatment system. Footage from the affected area shows cars partially submerged in the foam and people navigating through the unusual substance. Local authorities have confirmed that direct contact with this foam poses potential health risks. Residents exposed to the foam have reported various symptoms, including skin irritation, hives, and eye inflammation. Authorities urge citizens to avoid contact with the substance and to seek medical attention if symptoms appear.