NASA’s NISAR satellite reveals that Mexico City is sinking at an alarming rate, with some areas subsiding nearly 10 inches a year due to excessive groundwater extraction. This situation raises an urgent question: How did we reach this critical point?
Mexico City, built on the ancient lakebed of Lake Texcoco, relies on an aquifer that supplies around 60% of drinking water for its 22 million residents. However, over-extraction of groundwater has led to significant subsidence—some areas are sinking at rates exceeding 0.8 inches per month, translating to more than 9.5 inches annually. This chronic issue has roots dating back to the 1920s.
The relentless urban development in the city has exacerbated these problems, causing infrastructure damage that includes fractured roads and tilted buildings. Areas near Benito Juarez International Airport are among the worst affected by this subsidence. The Angel of Independence monument has even required 14 additional steps at its base due to the ground sinking beneath it.
The soil composition—predominantly clay-rich—loses its structural support when water is pumped out to meet the demands of a growing population. Once the ground compresses, the process becomes largely irreversible; even if water levels are restored, the city cannot regain its original elevation.
David Bekaert from NASA emphasizes that “Mexico City is a well-known hot spot when it comes to subsidence,” highlighting the urgency for further monitoring and potential interventions. As the NISAR satellite continues tracking ground movement, we can expect new discoveries about this pressing issue.
Officials have not shared specific timelines for remedial actions or long-term solutions. The complexities surrounding urban planning and water management will require collaborative efforts from various stakeholders to address this multifaceted crisis.
