Cities have a complicated relationship with the water beneath them.
They draw it up to meet demand. They concrete over the land that recharges it. They build foundations and tunnels and drainage systems through it. And then, when groundwater behaviour changes in ways the infrastructure was not designed to handle, they are surprised.
This pattern has played out in megacities on every continent. The consequences differ in scale but not in mechanism. Understanding what sound groundwater management actually requires in an urban context is not just an academic exercise. It is a practical question that affects how cities plan, build, and maintain the infrastructure hundreds of millions of people depend on.
Two Opposite Problems, Both Caused by Urbanisation
Urban areas can face groundwater problems from two directions simultaneously, often within the same city boundary.
The first is depletion. Rapid urban growth creates demand that outpaces surface water supply. Cities drill deeper, extract more, and aquifer levels fall. Parts of Jakarta have subsided at rates between 50 and 280 millimetres per year over recent decades, driven primarily by groundwater over-extraction. Bangkok reached its critical point in the early 1980s when subsidence rates hit 120 millimetres per year before mitigation measures were introduced. The pattern repeats in Ho Chi Minh City, Dhaka, Shanghai, and dozens of others. ESCAP research tracking 50 of the most severely subsidence-affected urban areas globally found that 52 percent are in Asia and the Pacific. The economic damage runs to billions annually in damaged infrastructure, flood exposure, and reduced productivity.
The second problem is the opposite: rising groundwater. Where extraction has been reduced, where impervious surfaces prevent rainfall from draining away from aquifers, or where sea-level rise is pushing coastal water tables upward, groundwater levels climb. Research published in Nature Cities in 2025 identified water table rise as a consistently overlooked hazard in urban infrastructure planning, alongside salinization and compound climate-related changes. Roads, sewer systems, buried utilities, and building foundations all experience deterioration when the groundwater they were designed to sit above them starts sitting beside or beneath them.
A 2025 PNAS study on China’s urban groundwater found that 180 cities, accounting for 311 million urban residents, faced at least one groundwater pressure, whether depletion, contamination, or both. Forty cities faced dual quantity and quality pressures simultaneously.
Cities are not choosing between these problems. Many are managing both, in different parts of the same urban area, often without a coordinated framework connecting the two.
What Urbanisation Does to the Groundwater System
Three structural changes accompany urban development that alter groundwater behaviour regardless of geography.
Impervious surface coverage reduces recharge. Natural land allows rainfall to infiltrate and replenish aquifers gradually. Concrete, asphalt, and buildings replace that infiltration with runoff. Where recharge is reduced and extraction continues, water tables fall. Where recharge is eliminated entirely and extraction stops, the absence of any self-correcting mechanism means the aquifer responds more sharply to every pressure placed on it.
Underground infrastructure creates new flow pathways. Tunnels, drainage networks, utility conduits, and basements all intersect the groundwater system. Leaking water mains recharge aquifers in some areas. Drainage and tunnels drain them in others. A US study of Hoboken, New Jersey, found that an aging sewage network was actively draining the shallow groundwater table, causing sewer overflows even in dry conditions. The subsurface is not passive infrastructure sitting in the ground. It interacts continuously with the water system around it.
Contamination accumulates. Urban groundwater quality reflects land use history. Industrial sites leave legacy contamination that persists for decades. Informal settlements with unregulated septic systems, storage facilities, fuel stations, and waste disposal sites all contribute to groundwater quality degradation that compounds over time. Research on China’s urban groundwater found a clear relationship between city scale, economic development history, and groundwater quality impairment, with smaller and lower-income cities facing disproportionate quality risks due to weaker regulatory oversight and older, less-managed industrial infrastructure.
Strategies That Work
The cities that have managed urban groundwater problems most successfully share a common characteristic: they treated groundwater as urban infrastructure, not as a resource to be used without a management framework.
Tokyo is the most documented example. Groundwater extraction controls were introduced in the early 1960s. Subsidence stopped within a decade of groundwater recovery beginning. The intervention required both regulatory action and investment in alternative water supply infrastructure to replace what had been drawn from the aquifer. Both were necessary. Regulation without alternative supply would have been unenforceable. Alternative supply without regulation would not have reduced aquifer stress.
Shanghai applied a different tool: active artificial recharge combined with extraction regulation. Recharging the aquifer system with treated water during periods of surplus supply slowed and eventually partially reversed subsidence in affected areas. The approach required long-term monitoring, modelling of aquifer response, and coordination between water supply, wastewater, and groundwater management authorities, functions that in many cities sit in separate departments with no operational connection.
Managed aquifer recharge, whether through infiltration basins, recharge wells, or permeable pavement in suitable geological settings, is one of the most effective tools available for urban groundwater management. It does not work everywhere. The geological setting determines where it can be applied effectively and what recharge rates are achievable. But where it is feasible, it addresses both the depletion problem and the urban water security challenge simultaneously.
Seepage as a Signal of System Failure
In an urban groundwater context, seepage into buildings, tunnels, and infrastructure is not simply a maintenance problem. It is a signal that the interaction between the groundwater system and the built environment is not in equilibrium.
Seepage into a metro tunnel may indicate that the dewatering design assumptions have been exceeded. Seepage through a basement wall in an area that previously had no groundwater problems may indicate that the water table has risen due to reduced extraction or changed drainage patterns. Seepage carrying contamination may indicate that the barrier between a legacy industrial site’s pollutant plume and the surrounding urban infrastructure has been compromised.
Reading these signals accurately requires understanding the groundwater system, not just the structure that is getting wet.
The Planning Gap
Most urban groundwater problems can be traced, at least partly, to a planning gap: groundwater was not treated as a design constraint in the decisions that shaped the urban form.
Integrated water management, where groundwater behaviour is factored into land use planning, infrastructure design, drainage strategy, and long-term asset management, is the framework that closes that gap. It is not a new idea. It is applied inconsistently.
The Groundwater Company works with urban developers, infrastructure authorities, and environmental agencies on exactly this challenge: connecting the hydrogeological picture to the planning and design decisions that determine how urban groundwater systems behave over decades, not just during the project at hand.
The cities that manage this well treat groundwater as a shared urban asset, with the same seriousness they apply to roads, water supply systems, and drainage networks. The ones that manage it poorly tend to discover the consequences one expensive incident at a time.
