Brief Context
Context The Central Ground Water Board (CGWB) highlights a disturbing rise in toxic contaminants across India’s aquifers. About India holds 18% of the world’s population but only 4% of its freshwater resources, placing enormous pressure on available water systems. India depends on groundwater for about 85% of its rural drinking water needs and around 60% of irrigation water.
Source Content
Syllabus: GS3/ Environment
Context
- The Central Ground Water Board (CGWB) highlights a disturbing rise in toxic contaminants across India’s aquifers.
About
- India holds 18% of the world’s population but only 4% of its freshwater resources, placing enormous pressure on available water systems.
- India depends on groundwater for about 85% of its rural drinking water needs and around 60% of irrigation water.
Crisis of Groundwater Contamination
- India’s aquifers show simultaneous contamination with, Arsenic, Fluoride, Nitrate, Uranium, Salinity and Heavy metals.
- Nearly 20% of samples nationwide exceed permissible limits for contaminants such as uranium, fluoride, nitrate, and arsenic.
- North Indian states like Punjab, Haryana, Rajasthan, Delhi, show alarming uranium levels in pre- and post-monsoon samples.
- Central India faces increasing fluoride and nitrate concentrations linked to agricultural intensification, while eastern states continue to struggle with arsenic pockets.
Drivers Behind the Crisis
- Agricultural Pollution: Excessive use of nitrogenous fertilisers leads to nitrate leaching.
- Paddy-wheat monoculture in north India accelerates groundwater depletion, increasing heavy-metal uptake from deeper strata.
- Geogenic Contamination: Fluoride and arsenic contamination partly originate from natural geological formations, but drilling deeper borewells intensifies exposure.
- Anthropogenic Factors: Industrial effluents, untreated sewage, landfill seepage, and peri-urban waste dumping add heavy metals and toxins.
- Weak Groundwater Governance: India still follows the principle that land ownership confers groundwater ownership, enabling unrestricted extraction.
- Fragmented institutional roles and limited monitoring hinder long-term aquifer management.
Impact of contaminated groundwater
- Public Health cost: Arsenic and fluoride exposure cause long-term skeletal, neurological, and cognitive impairments, disproportionately affecting children.
- Fluorosis in Gujarat’s Mehsana district has reduced earning capacity and trapped families in cycles of wage loss, debt, and medical expenses.
- Impact on productivity: Heavy metals and chemical residues reduce crop yields, damage soil health, and enter the food chain.
- Research shows that farms near polluted water bodies experience lower productivity and incomes.
- India’s Export Competitiveness: International markets increasingly demand clean, traceable, and compliant agricultural produce.
- Instances of export rejections signal emerging risks; if contamination spreads to major crops, India’s agricultural export sector could face serious setbacks.
Government Initiatives
- Jal Shakti Abhiyan (2019): Focuses on water conservation and groundwater recharge in water-stressed districts.
- Amrit Sarovar Mission: Aims to develop and rejuvenate 75 water bodies per district.
- National Aquifer Mapping Program (NAQUIM): Helps delineate and understand aquifers for sustainable management.
- Atal Bhujal Yojana, was launched to improve groundwater management in priority areas with critical and overexploited blocks.
Way Ahead
- Comprehensive Policy Reforms: Establish stringent extraction limits in over-exploited zones and incentivise water-efficient agricultural practices.
- Integrated Monitoring Systems: Leverage real-time data analytics to track contamination trends and predict future risks.
- Public Awareness Campaigns: Educate communities about contamination risks and promote the adoption of low-cost treatment technologies.
- Targeted Remediation: Deploy region-specific solutions such as rainwater harvesting in salinity-prone areas and phosphate reduction strategies to curb fluoride and nitrate contamination.
Source: BS