Groundwater Crisis — Depletion, Contamination & Governance

Key Concepts

Groundwater is water held in soil pores and rock fractures below the earth's surface, replenished primarily through rainfall infiltration and river seepage. It accounts for roughly 30% of the world's freshwater and is the lifeline of India's agriculture — irrigating approximately 65% of net irrigated area and supplying drinking water to over 85% of rural households.

India extracts nearly 25% of the world's total groundwater, making it the largest groundwater user globally — ahead of the United States and China combined.

Extent of Depletion — CGWB Assessment 2024

The Central Ground Water Board (CGWB), under the Ministry of Jal Shakti, conducts periodic national groundwater assessments.

Key findings from the 2024 National Groundwater Assessment:

Improvement trend: The percentage of over-exploited units declined from 17.24% in 2017 to 11.13% in 2024 — a significant improvement, attributed partly to Atal Bhujal Yojana interventions and improved recharge.

Critical states: Punjab, Haryana, and Rajasthan account for the most severe depletion, with multiple blocks classified as over-exploited. In Punjab, groundwater levels have fallen by several metres per decade in key agricultural districts — a direct result of the paddy-wheat cropping cycle and heavily subsidised (effectively free) electricity for pump sets.

Root Causes of Depletion

1. Paddy-wheat cultivation cycle: The Green Revolution spread water-intensive paddy cultivation far beyond its natural ecological range (Punjab and Haryana), requiring 1,000–3,000 litres of water per kg of rice.

2. Free or heavily subsidised electricity: Agricultural power subsidies in Punjab, Haryana, and Rajasthan eliminate the price signal that would otherwise encourage efficient water use, enabling farmers to pump aquifers without economic cost.

3. Lack of regulatory enforcement: Groundwater is treated as a property right in India — whoever owns the land can pump as much as they wish. Groundwater regulation remains constitutionally in the State List, fragmenting governance.

4. Expansion of irrigated area: The area under borewell-based irrigation expanded dramatically from the 1970s onwards, driven by cheap pump technology and subsidised credit.

Contamination Crisis

Arsenic Contamination

Arsenic occurs naturally in the alluvial sediments of the Ganges-Brahmaputra delta system.

• West Bengal: 79 blocks across 9 of 19 districts are arsenic-contaminated. An estimated 26 million people are at risk from arsenic-contaminated groundwater (>10 μg/L WHO limit). Major affected districts include Malda, Murshidabad, Nadia, North and South 24 Parganas, and Burdwan.
• Bihar: Approximately 16 districts have reported arsenic contamination, with maximum concentrations recorded in Patna, Bhagalpur, and Buxar districts.
• Other states: Jharkhand, Uttar Pradesh, Chhattisgarh, and Assam also report arsenic-affected areas along the Ganga plain.

Fluoride Contamination

Fluoride occurs naturally in granite and fluorite-bearing rocks. Chronic exposure above 1.5 mg/L causes dental and skeletal fluorosis. Affected states include Rajasthan (most severe), Andhra Pradesh, Telangana, and parts of Madhya Pradesh and Gujarat. Rajasthan's arid aquifers concentrate fluoride due to low dilution.

Governance Framework

NITI Aayog's Composite Water Management Index (CWMI)

The CWMI ranks states on 28 indicators across 9 themes including groundwater restoration. The 2018 CWMI report warned that 21 major cities (including Delhi, Bengaluru, Chennai, Hyderabad) could exhaust groundwater by 2020 — a projection that signalled the severity of the crisis and galvanised policy action.

Atal Bhujal Yojana (Atal Jal)

Launched on 25 December 2019 by PM Narendra Modi (on Atal Bihari Vajpayee's 95th birth anniversary), with World Bank co-funding and a total outlay of ₹6,000 crore (2020–2025):

• 7 priority states: Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, and Uttar Pradesh
• Covers 78 districts and approximately 8,350 Gram Panchayats
• Focuses on community-led groundwater management — Water Security Plans at Gram Panchayat level
• Incentivises states that improve groundwater management through performance-linked funding

Jal Shakti Ministry and Jal Jeevan Mission

The Ministry of Jal Shakti (created 2019, merging Ministry of Water Resources with Drinking Water & Sanitation) oversees groundwater policy. The Jal Jeevan Mission (2019) targets tap water connections to every rural household — reducing dependence on open wells and hand pumps drawing from contaminated shallow aquifers.

Solutions and Best Practices

Rooftop rainwater harvesting: Mandatory in Chennai (since 2001), Delhi, and Bengaluru — has demonstrably recharged urban aquifers.

Check dams and percolation tanks: Traditional water harvesting structures in Gujarat and Rajasthan — revived under MGNREGS and PMKSY to recharge aquifers.

Community-managed recharge: Hiware Bazar (Maharashtra) is a celebrated example — through watershed management and community-managed water budgeting, groundwater levels rose from 80 wells in 1995 to over 200 functional wells by 2010.

Crop diversification: Shifting Punjab and Haryana from paddy to less water-intensive crops (maize, pulses) is the long-term structural solution; MSP reform is key to making this economically viable.

Recent Developments (2024–2026)

CGWB 2024 Assessment — Improved Figures but Quality Concerns

The Central Ground Water Board (CGWB) National Groundwater Assessment 2024 reported improved groundwater levels compared to the 2017 assessment. Total annual groundwater recharge stands at 446.90 billion cubic metres (BCM) and annual extraction at 245.64 BCM, giving an overall extraction stage of 60.47%. Over-exploited assessment units (blocks/mandals) declined from 17.24% (1,592 units) in 2017 to 11.13% (751 units) in 2024, with units in the "safe" category increasing from 62.6% to 73.4%.

However, the Annual Groundwater Quality Report 2024, released by the Ministry of Jal Shakti on 31 December 2024, revealed significant contamination issues — fluoride contamination in 17 states, arsenic in 21 states, nitrate exceeding permissible limits in 27 states, and iron contamination in 25 states. This dual challenge of quantity improvement alongside quality deterioration underlines the complexity of India's groundwater crisis.

UPSC angle: CGWB 2024 data (60.47% extraction stage, 751 over-exploited units, decline from 2017), the quality report findings, and the four major contaminants are high-priority Prelims facts.

Atal Bhujal Yojana — Progress 2024

Atal Bhujal Yojana (ABY), a ₹6,000 crore Central Sector Scheme implemented in 7 states (Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, Uttar Pradesh), focuses on demand-side groundwater management through community participation and aquifer mapping. By 2024, the scheme covered 8,220+ Gram Panchayats across over-exploited, critical, and semi-critical groundwater blocks.

The scheme promotes participatory groundwater management: Water Security Plans (WSPs) prepared at Gram Panchayat level identify demand reduction measures (crop diversification, micro-irrigation, recharge structures). A 2024 mid-term evaluation found measurable improvement in groundwater levels in 60% of ABY-covered areas, though the evaluation noted that behaviour change toward water conservation remains slow in high-water-demand crop zones (sugarcane, paddy).

UPSC angle: Atal Bhujal Yojana — coverage (7 states, 8,220+ GPs), funding (₹6,000 crore), World Bank partnership, and demand-side management approach are Prelims and Mains data points.

Jal Jeevan Mission and Groundwater Demand 2024

The Jal Jeevan Mission (JJM), targeting 100% household tap water connectivity (Har Ghar Jal), has provided functional household tap connections (FHTC) to over 15 crore rural households as of 2024, against a target of 19.4 crore. However, JJM's reliance on groundwater extraction in many states has raised concerns about accelerating aquifer depletion in already stressed regions.

A 2024 NITI Aayog assessment found that in states like Rajasthan and Gujarat, where JJM is heavily dependent on groundwater, the scheme risks undermining its own long-term sustainability by depleting the very aquifers it taps. The Ministry of Jal Shakti responded by emphasising mandatory aquifer mapping and Water Security Plans before commissioning new groundwater-dependent JJM schemes.

UPSC angle: JJM's groundwater dependence, the sustainability challenge, and the nexus between rural water supply and groundwater governance are Mains GS-2/GS-3 themes.

PYQ Relevance

• 2022 GS3: "Groundwater depletion is one of the most serious environmental challenges facing India. Examine the causes and suggest a sustainable management framework."
• 2019 GS3: "Discuss the issue of groundwater contamination in India with special reference to arsenic and fluoride."
• 2016 GS3: "What is the significance of Atal Bhujal Yojana for sustainable groundwater management?"

Exam Strategy

For Prelims: CGWB 2024 — 751 over-exploited units out of 6,746; India = 25% of global extraction; Atal Bhujal Yojana = 7 states, ₹6,000 crore, launched Dec 2019; arsenic affects West Bengal (26 million at risk) and Bihar (16 districts).

For Mains: Use a cause-effect-solution structure. Causes: paddy-wheat cycle, free electricity, property rights over groundwater. Effects: falling water tables, arsenic/fluoride contamination, agrarian distress. Solutions: Atal Bhujal Yojana (community model), pricing reform, crop diversification, MGNREGS for recharge works. Mention constitutional dimension — water in State List, need for Model Groundwater Bill.

Value addition: India's National Water Policy 2012; the Model Groundwater (Sustainable Management) Bill, 2017 — states reluctant to adopt; CGWB's Aquifer Mapping Programme covering 25 lakh sq km.