Groundwater overuse

Also called: Groundwater depletion, Groundwater over-extraction, Groundwater overexploitation · Topic: Environment and Sustainable Development · NCERT: Class 10, Ch 1 "Development"; Class 11, Ch 7 "Environment and Sustainable Development"

Meaning

Groundwater overuse means pumping water out of the ground faster than rain can refill (recharge) it, so the water table (the level of water under the ground) keeps falling year after year.

It matters because groundwater is India's main source of water for farms and cities. When too much is pumped out, wells dry up, farming costs rise, and the land degrades. NCERT lists "pumping groundwater faster than rain refills it" as one of the 12 causes of land degradation.

Formula (used by CGWB): Stage of groundwater extraction (%) = Annual groundwater extraction ÷ Annual extractable groundwater resource × 100

Explanation

How it works: recharge vs extraction

• Recharge is the water that goes back into the ground each year, mainly from rain. Some also seeps down from canals, tanks and irrigated fields.
• Extractable resource is the part of recharge that can safely be pumped out. It is smaller than total recharge, because some groundwater must be left to feed rivers and springs.
• Extraction is the water actually pumped out for farms, homes and industry.
• The rule:
• extraction below the extractable resource → the water table stays stable

• extraction above the extractable resource → the stored water gets used up → the water table falls

• Think of it as a bank account. Recharge is income. Extraction is spending. Overuse means spending the savings, not just the income.

Measuring it: stage of extraction

• Worked example (India, DGWRA 2024) [2]:
• Annual extraction = 245.64 BCM (billion cubic metres)
• Annual extractable resource = 406.19 BCM

• Stage of extraction = 245.64 ÷ 406.19 × 100 = 60.47%

• Worked example (one block, made-up numbers):

• A block can safely extract 100 units a year but pumps out 120 units.
• Stage = 120 ÷ 100 × 100 = 120%.

• Above 100% the block is "over-exploited", because it takes out more than nature puts back each year.

• The averaging trap: a national figure of about 60% looks safe, but it hides over-exploited pockets such as Punjab.

Why it rises: the economic drivers

• Groundwater as an open access resource (a resource anyone can use and nobody owns):
• each farmer gets the full gain from pumping more
• the falling water table hurts everyone together
• so everyone pumps too much → the aquifer runs down

• This is the tragedy of the commons (NCERT cause no. 11 of land degradation).

• Free or flat-rate farm power:

• pumping costs the farmer almost nothing extra → there is no reason to save water → pumps run for longer.

• Crop choice pushed by MSP:

• assured prices for rice and sugarcane → farmers grow these water-hungry crops even in water-scarce Punjab → more pumping.

• Virtual water exports (the water used up in making a product):

• India exports rice and sugarcane products → the water used to grow them in effect leaves the country → a water-scarce country exports its scarce water.

• Fast-growing cities that lack piped supply rely on borewells.

What makes it fall

• More recharge, for example from rainwater harvesting and restoring tanks and wetlands.
• Less extraction, for example through crop diversification, metering and pricing of farm power, and efficient irrigation.
• Community rules for sharing the aquifer, such as those under Atal Bhujal Yojana (2020).

In India

• Who measures it: the Central Ground Water Board (CGWB) works with the States to prepare the Dynamic Ground Water Resource Assessment (DGWRA) [2].
• DGWRA 2024 (released 31 December 2024) [2]:
• Annual recharge: 446.90 BCM
• Annual extractable resource: 406.19 BCM
• Annual extraction for all uses: 245.64 BCM
• Stage of extraction: 60.47% for India as a whole
• Of 6,746 assessment units (blocks, mandals, talukas), 4,951 (73.4%) are "Safe", up from 62.6% in 2017.

• Since the 2017 assessment, recharge has risen by about 15 BCM and extraction has fallen by about 3 BCM.

• A newer 2025 assessment has also been released [3].

• NCERT Class 10 (Development) data:
• about 300 districts saw water levels fall by more than 4 m in 20 years
• one-third of the country overuses groundwater now, and this could rise to 60% within 25 years

• hotspots: Punjab, western UP, the hard-rock plateaus of central and south India, some coastal areas and fast-growing cities

• Scheme: Atal Bhujal Yojana (2020) funds community-led groundwater management in water-stressed areas.

• Place in NCERT: "management of fresh water" is one of NCERT's five priority environmental issues for India.

Don't confuse with

• Water pollution: this is about the quality of water (sewage, effluents, farm chemicals). Groundwater overuse is about the quantity of water left under the ground.
• Waterlogging: this comes from poor irrigation planning, which makes the water table rise and the soil turn salty (NCERT cause no. 9). Overuse makes the water table fall (cause no. 10). Both are separate causes of land degradation.
• Recharge vs extractable resource: recharge (446.90 BCM) is all the water that goes back into the ground. The extractable resource (406.19 BCM) is the smaller part that can be safely pumped. The stage of extraction is calculated on the extractable resource, not on recharge [2].
• Virtual water: this is not a kind of groundwater. It is the water embedded in a traded product, and it becomes one driver of overuse when water-hungry crops are exported.

Prelims Hooks

• Stage of groundwater extraction = extraction ÷ extractable resource × 100. For India it was 60.47% in DGWRA 2024 [2].
• A unit with a stage above 100% is "over-exploited".
• DGWRA 2024: prepared by CGWB and the States. 73.4% of the 6,746 assessment units are "Safe", up from 62.6% in 2017 [2].
• Trap: between the 2017 and 2024 assessments, recharge rose (about +15 BCM) and extraction fell (about −3 BCM). It is not "both rose" [2].
• Atal Bhujal Yojana (2020): the key word is community-led groundwater management in water-stressed areas.
• NCERT lists groundwater overuse as a cause of land degradation, and fresh-water management as one of India's five priority environmental issues.

Mains Points

• The national average hides local crises: 60.47% overall looks comfortable, but over-exploited blocks remain in Punjab, western UP and the hard-rock plateaus [2]. Policy therefore has to target blocks, not the national figure.
• Perverse incentives vs sustainability:
• free or flat-rate power, MSP-led rice and sugarcane in water-scarce Punjab, and virtual-water exports all push farmers to overuse water
• the fix combines crop diversification, metering and pricing of farm power, and community management (Atal Bhujal)

• pricing must be designed so that it does not hurt small and poor farmers

• Commons governance and sustainable development: groundwater is an open access resource, so private pumping leads to the tragedy of the commons. Community rules, as under Atal Bhujal Yojana, fit the Brundtland (1987) idea of meeting today's needs without harming future generations. They also link to the SDGs (2015-2030).

Related concepts

• Poverty-induced degradation and pollution from affluence
• Land degradation
• Deforestation
• Soil erosion
• Open access resource
• Biodiversity loss
• Air pollution
• Industrial pollution
• Water pollution
• Virtual water

Read more

• State of India's environment: the dichotomy and the five priority issues