The unsuitability of tap water for consumption in Mexico stems primarily from issues related to water purification standards and infrastructure. Water sources, while initially treated, can become contaminated during distribution due to aging or poorly maintained pipes, often leading to the presence of bacteria, parasites, and other microorganisms harmful to human health. These contaminants can cause gastrointestinal illnesses.
This situation has significant economic and health implications. Travelers and residents alike incur expenses purchasing bottled water or investing in water filtration systems. Furthermore, the prevalence of waterborne illnesses impacts productivity and places a strain on healthcare resources. Historically, inadequate investment in and maintenance of water infrastructure have contributed to the persistence of this issue.