Oomsapas La Paz workers excavated roughly 12 meters of tree roots from a 3-inch water main on Calle Reforma in Colonia Guerrero, restoring service to homes across at least two city blocks. The municipal water utility (Organismo Operador Municipal del Sistema de Agua Potable, Alcantarillado y Saneamiento) discovered the blockage during a ground-level inspection after residents reported a steady drop in water pressure.
Crews dug down to the underground pipe, cut out the damaged section, and replaced it with new material. The roots had grown inside the line over time, gradually choking off flow until pressure dropped to levels residents could no longer ignore.
How Root Intrusions Go Undetected
Oomsapas director Abimael Ibarra Abúndez said root intrusions are almost always found in the field rather than through remote monitoring. The utility lacks sensors on most of its older distribution lines, so technicians rely on pressure complaints and physical inspections to locate problems.
Tree roots seek out moisture and can enter pipes through tiny cracks, joint gaps, or corroded spots. Once inside, they expand rapidly, trapping sediment and reducing diameter. A 3-inch line, common in older La Paz neighborhoods, can lose most of its capacity before anyone on the surface notices a change.
Aging Infrastructure in La Paz
Colonia Guerrero sits in one of La Paz’s older residential areas, where much of the underground water network dates back decades. La Paz has long struggled with infrastructure maintenance. Less than 25% of residential and commercial buildings in the city have water meters, according to past analyses, making leak detection and pressure monitoring difficult across much of the grid.
The repair falls under an ongoing inspection program backed by La Paz Mayor Milena Quiroga Romero. The program prioritizes ground-level checks in neighborhoods with aging pipe networks. Ibarra Abúndez said crews will continue surveying nearby streets in Colonia Guerrero for additional damage.
Normal water pressure has been restored to all affected homes on Calle Reforma. The story was first reported by BCS Noticias.