Report on Groundwater Contamination

Report on Groundwater Contamination

The Central Groundwater Board (CGWB) recently released a report highlighting alarming levels of groundwater contamination across India. It indicates a troubling rise in nitrate contamination, among other pollutants, affecting both public health and the environment.

Key Findings of the CGWB Report

1. Increase in Nitrate Contamination:

   • By 2023, 440 districts reported excessive nitrate levels in groundwater, an increase from 359 districts in 2017.

   • 56% of India's districts now have nitrate concentrations exceeding the safe limit of 45 mg per litre.

2. Regional Hotspots:

   • Rajasthan (49%), Karnataka (48%), and Tamil Nadu (37%) are the states with the highest levels of nitrate contamination.

   • Other affected states include Maharashtra, Telangana, Andhra Pradesh, and Madhya Pradesh, especially in central and southern India.

3. Monsoon Impact:

   • Nitrate contamination increases post-monsoon, with 32.66% of samples exceeding safe limits during the rainy season, compared to 30.77% pre-monsoon.

4. Other Groundwater Contaminants:

   • Fluoride contamination remains significant in states like Rajasthan, Haryana, Karnataka, Andhra Pradesh, and Telangana.

   • Uranium contamination is also widespread, especially in over-exploited zones in Rajasthan, Punjab, Haryana, Gujarat, Tamil Nadu, Andhra Pradesh, and Karnataka.

5. Groundwater Extraction:

   • 60.4% of groundwater is being extracted across India, with a steady rate since 2009.

   • 73% of groundwater blocks are now classified as in the 'safe' zone, a significant improvement from 67.4% in 2022.

The Central Ground Water Board (CGWB)

• Established in 1970 under the Ministry of Water Resources (now Ministry of Jal Shakti), CGWB is the apex body for managing, monitoring, and regulating groundwater resources in India.

• The Central Ground Water Authority (CGWA), set up under the Environmental Protection Act, 1986, regulates groundwater development.

Key Functions:

• Groundwater monitoring and water quality assessments.

• Implementation of schemes for artificial recharge and rainwater harvesting to enhance groundwater levels.

• Releases hydrogeological reports, year books, and Atlases.

Sources of Groundwater Contamination

1. Agricultural Practices:

   • Overuse of fertilizers and pesticides leads to nitrate and phosphate leaching into the soil, contaminating groundwater.

   • Over-irrigation and excessive groundwater extraction exacerbate the issue.

2. Storage Tanks and Hazardous Sites:

   • Corroding tanks can leak gasoline, oil, or chemicals into groundwater.

   • Abandoned hazardous waste sites and landfills pose significant contamination risks if protective barriers are damaged.

3. Septic Systems:

   • Poorly maintained septic systems may leak waste and chemicals, polluting groundwater.

4. Atmospheric Contaminants:

   • Contaminants from the atmosphere or surface water can infiltrate and eventually reach groundwater.

5. Deforestation:

   • Deforestation disrupts natural filtration processes, leading to increased runoff and pollutants reaching groundwater systems.

Implications of Groundwater Contamination

1. Health Risks:

   • Nitrates, fluoride, and heavy metals are associated with significant health issues. Methemoglobinemia (Blue Baby Syndrome) caused by excessive nitrate contamination can be fatal for infants.

2. Waterborne Diseases:

   • Groundwater contamination increases the risk of waterborne diseases, especially in rural areas where water treatment systems are inadequate.

3. Food Safety:

   • Heavy metals and other pollutants from contaminated groundwater can accumulate in crops, affecting food safety and public health.

4. Environmental Impact:

   • Nitrate pollution can disrupt local ecosystems, affecting plant and aquatic life.

   • Soil contamination and salinization caused by pollutants can impact agricultural productivity.

5. Economic Costs:

   • Treatment of contaminated groundwater is costly.

   • Chronic contamination reduces the availability of clean water, leading to water scarcity and potential socio-economic crises.

Measures Taken to Curtail Groundwater Contamination

1. Jal Shakti Abhiyan (JSA):

   • A nationwide campaign focusing on water conservation and groundwater recharge.

2. National Aquifer Mapping and Management Program (NAQUIM):

   • A comprehensive program aimed at mapping groundwater resources and managing them sustainably.

3. Atal Bhujal Yojana (ABHY):

   • A scheme aimed at improving groundwater management in water-stressed areas through community participation and technology.

4. Pollution Control Programs:

   • The Central Pollution Control Board (CPCB) and State Pollution Control Boards enforce pollution control measures under the Water (Prevention and Control) Act, 1974.

   • Efforts to install Sewage Treatment Plants (STPs) and Effluent Treatment Plants (ETPs) to treat water before being released into the environment.

5. Public Awareness Campaigns:

   • Programs like “Catch the Rain” and the Swachh Bharat Mission educate the public about groundwater protection.

   • The Rajiv Gandhi National Ground Water Training and Research Institute (RGNGT&RI) provides training to stakeholders.

Way Forward

1. Regulate Fertilizer Use:

   • There is a need for stricter regulation on the overuse of nitrogenous fertilizers in agriculture. Encouraging sustainable farming practices can help mitigate nitrate contamination.

2. Promote Rainwater Harvesting:

   • Encouraging the harvesting of rainwater and replenishing groundwater through natural processes can help reduce dependence on over-exploited aquifers.

3. Improved Waste Management:

   • Efficient waste management systems, especially in urban areas, can help prevent groundwater contamination.

   • Decentralized waste treatment and recycling initiatives can reduce contamination risks.

4. Stricter Monitoring and Policies:

   • Increased monitoring of groundwater quality and more stringent regulations regarding chemical contaminants are necessary to curb further contamination.

Conclusion

The CGWB report underscores the growing issue of groundwater contamination in India, with significant health, environmental, and economic implications. Measures such as improved agricultural practices, better waste management, enhanced monitoring, and public awareness campaigns are critical for addressing this challenge. Sustainable groundwater management and conservation are essential to ensure safe water for future generations.