# Translation The recent discovery of traces or residue of cocaine in tap water in Bogotá and other Colombian capital cities has raised alarms among local authorities about the quality of urban water resources that citizens consume and use daily. You may be interested in: A drugged mother and a man nicknamed "el Flaco": first clues about the death of a 6-month-old baby in Tolima The revelation comes from the report 'Invisible Contamination', prepared by the Center for a Secure Free Society of the United States with scientific support from La Sabana University, a document that has sparked intense institutional controversy in the country. This technical report was based on the collection and analysis of samples taken between late 2025 and early 2026 in 12 Colombian cities, a sample representing approximately 17 million people (32% of the national population).