The groundwater potential of the gangetic valley is on a serious decline. How may it affect the food security of India?

Why the potential is declining

Green Revolution agriculture in the north-west Gangetic and adjacent plains linked HYV wheat and paddy to tubewells and free or cheap power. Paddy in a semi-arid Punjab autumn is a groundwater crop even when it looks like a monsoon crop. Alluvium invited deep boring. Electrification made the pump the main source of irrigation water. Recharge is limited where hardpan, urban sprawl, and vanishing ponds cut infiltration, and where canals leak less than they used to as lining spreads. Climate adds erratic rain and hotter evapotranspiration. In the lower Ganga the problem is often quality as well as quantity. Arsenic in parts of Bihar and West Bengal poisons the same aquifer people drink and, in places, irrigate from.

CGWB assessment units classed as over-exploited, critical, and semi-critical are the official language of serious decline. The Ganga itself has not dried. The usable, clean, economically lift-able groundwater is shrinking.

• Extraction: Millions of wells, energy subsidy, and a rice–wheat lock-in drive pumping.
• Recharge failure: Concretised floodplains, lost wetlands, and monsoon extremes reduce refill.
• Quality: Arsenic, salinity, and fluoride take water out of the food and drinking budget even when the well is not dry.

Pathways to food security risk

India’s calorie security still leans on MSP-supported wheat and rice from this belt, stored by the FCI and moved through the PDS. If wells fail or power-plus-depth costs rise sharply, yields fall or shift to less irrigated crops before institutions are ready. Farmers may deepen bores, idle paddy, or sell land. Nutrition security is hit if farmers abandon pulses and milk fodder for whatever still grows, or if arsenic enters the food chain. Inter-State tension over canal water will rise as groundwater ceases to be a silent buffer. The eastern Gangetic plain has unused groundwater in some pockets and a different poverty. A simple plan to move all paddy east faces power, flood, and tenure constraints.

• Buffer loss: Groundwater was the drought insurance of the Green Revolution.
• Price and PDS: Scarcer irrigation raises cost and political risk of cereal stocks.
• Regional shift: Without a just transition, decline in the north-west becomes a national food problem.

What a food-water response looks like

The reply is not only more canals. Cropping has to move away from paddy where the aquifer is mined. Direct-seeded rice, shorter-duration varieties, and diversification into maize, pulses, oilseeds, and millets where diets and MSP allow are needed. Power cannot stay a flat subsidy for midnight pumping. Recharge through ponds, floodplain protection, and aquifer storage must be treated as infrastructure. Atal Bhujal and CGWB maps are useless if panchayats never see them. Eastern intensification, if it comes, needs power and flood management. It cannot be a simple copy of Punjab.

• Demand side: Policy should seek less water per calorie, not only more water per field.
• Quality: Arsenic-safe drinking and irrigation rules are needed in the lower Ganga.
• Institutions: Agricultural and water policy must be joined, because the PDS still depends on groundwater.

Food security policy that only counts foodgrain tonnes will miss the water tonnes used under the field.