The hidden danger beneath our cities: Groundwater's silent threat to urban infrastructure
Climate change is causing a silent crisis beneath our feet, one that could cripple coastal cities. Researchers from the University of Rhode Island, led by assistant professor Christopher Russoniello, have uncovered a critical issue that has been lurking unnoticed: the rise of groundwater levels. This phenomenon, often overlooked, poses a significant threat to the very foundation of our urban environments.
In a recent commentary published in Nature Cities, titled "Invisible Groundwater Threats to Coastal Urban Infrastructure" (https://www.nature.com/articles/s44284-025-00298-8), Russoniello and colleagues shed light on three major hazards. These include the rise of the water table, groundwater salinization, and the complex interplay of man-made and climate-related groundwater changes. But here's where it gets controversial—these hazards have been hiding in plain sight, yet they are rarely discussed in urban planning.
The impact of these threats is far-reaching. Roads, sewers, septic systems, gas and electric lines, and building foundations are all at risk. Saltwater intrusion, a consequence of groundwater changes, can wreak havoc on buried pipes and tanks, leading to corrosion and potential failure. And this is the part most people miss—the very infrastructure that supports our daily lives is under siege.
"Groundwater's role in surface flooding and other urban hazards is more significant than we previously thought," Russoniello explains. Previous research has focused on rural areas, examining the effects on septic systems and natural environments. But the impact on densely populated urban areas is now becoming clearer.
Climate-driven groundwater changes can cripple a city's ability to protect its infrastructure. Rising groundwater levels and increased salinity can damage buried structures, disrupt wastewater management, and compromise drinking water sources. And the consequences don't stop there—surface drainage is reduced, exacerbating flooding risks.
So, what can be done? Russoniello and his team propose several solutions. These include using corrosion-resistant materials for pipes and concrete reinforcement in vulnerable areas, improving subsurface drainage systems, and strategically placing pumping wells to manage water levels. Additionally, geophysical surveys and multi-level wells equipped with sensors can monitor groundwater levels and salinity, providing crucial data for informed decision-making.
"Our research aims to be a wake-up call," Russoniello states. "With climate change and rising sea levels, we must take action to safeguard our aging urban infrastructure." The team's work in Warren, Rhode Island, supported by an NSF EPSCoR grant, demonstrates the importance of interdisciplinary collaboration. By involving social scientists, groundwater specialists, and engineers, they aim to understand community needs and develop effective adaptation strategies.
The findings could revolutionize coastal urban infrastructure resilience. New research programs integrating urban planning, social and environmental sciences, civil and materials engineering, coastal science, and hydrogeology are essential. These efforts will enhance our understanding, prediction, and prevention of groundwater-related hazards, ensuring a safer and more sustainable future for our cities.
But the question remains—are we doing enough to address this hidden crisis? The research highlights the need for immediate action and innovative solutions. What do you think? Is it time to dig deeper and confront the silent threat of groundwater rise?
