GUADALAJARA, October 17, 2026 (DAILYNWZ) — A worsening water-quality crisis in Guadalajara has sparked protests over contaminated tap water, escalating scrutiny of Mexico’s water management and forcing President Claudia Sheinbaum to promise a review of two infrastructure projects.
Residents across the metropolitan area of more than five million people have reported foul-smelling water containing brown or black sediment. Demonstrations are expected to continue in the coming days as videos of murky water flowing from household taps spread on social media.
A major protest last weekend ended in clashes after police used water cannons and tear gas. Dozens of people were injured, and officials said nearly 40 were arrested. Sheinbaum criticized the police response and pledged to review two water infrastructure projects serving the area.
The crisis has raised concerns about the safety of the water supply in western Jalisco state, home to Guadalajara, one of Mexico’s largest cities and its main industrial and manufacturing center. It also reflects wider problems across the country, where aging infrastructure, pollution and pressure on limited water resources have undermined water quality and reliability.
A June study by the Mexican Institute for Community Development (IMDEC), based on 184 household water samples from 90 neighborhoods, found that more than 93% contained no detectable residual chlorine. The disinfectant is normally used to help protect drinking water against bacterial contamination.
The study also found elevated levels of lead, mercury, nitrates and E. coli, a bacterial indicator of fecal contamination, in some samples. IMDEC called for a public-health alert, independent testing by accredited laboratories and investigations into the sources of contamination.
A spokesman for the Jalisco government did not respond to a request for comment.
At a rally on Thursday evening, 54-year-old resident Aleida Morales said the water reaching her home had often been cloudy and brown for at least 15 years. She argued that Guadalajara’s economic development, including its role as a host city for this year’s World Cup, had come at the expense of environmental protection.
“There must be other, environmentally sustainable ways to create jobs,” Morales said. “The current approach is poisoning us.”
She recalled that her grandparents had described the region’s rivers and waterfalls as a “paradise” three decades ago. “Today, they are the source of toxic contamination,” she added.
Pollution Pressures Build Over Decades
Guadalajara lies within the Lerma-Santiago watershed, one of Mexico’s most polluted river systems, long affected by wastewater, industrial discharges and rapid urban growth.
Allan Tejeda, an environmental engineering expert at the University of Guadalajara, said the crisis reflected years of accumulated pressures rather than a single contamination event. Untreated or poorly treated wastewater, direct or undocumented discharges, urban expansion and chronic underinvestment had compounded the problem, he said.
Existing treatment facilities are struggling to cope with the volume and range of contaminants entering the system, leaving them increasingly inadequate for the region’s needs.
“These issues have never received the attention they require,” Tejeda said.
Federal authorities have acknowledged the region’s wider environmental problems. In July, Sheinbaum and Environment Secretary Alicia Barcena launched a 20 billion-peso ($1.09 billion) restoration program covering the Lerma-Santiago basin and two other heavily polluted river systems. They said authorities had identified hundreds of priority sources of pollution.
The National Assembly for Water, Life, and Territory, a Mexican rights coalition, expressed solidarity with protesters and called for “a real, comprehensive and verifiable solution” to Guadalajara’s water crisis.
“Water is not a concession granted by governments nor a privilege reserved for those who can afford to pay for it,” the group said. “It is indispensable for life, health, food, work and the survival of our communities.”
