Groundwater Pollution Driving Chronic Illness

Context

Groundwater, the primary source of drinking water for a large portion of the population, particularly in rural India, is increasingly facing severe contamination issues. This contamination acts as a silent killer, subtly increasing the burden of chronic diseases and posing a major public health challenge.

Major groundwater contaminants and their sources

• Geogenic Contaminants: These naturally occurring pollutants, often exacerbated by human activities, include:
  • Arsenic: Naturally occurring at very high concentrations in geological formations, such as those in the Gangetic belt (West Bengal, Bihar, Uttar Pradesh and Assam).
  • Fluoride: Problems with excess fluoride levels in regions of Rajasthan, Andhra Pradesh and Telangana.
  • Uranium: Found in Punjab, Andhra Pradesh and Rajasthan and also linked with greater use of phosphate fertilizers and depressurization of aquifers.
• Anthropogenic Contaminants: These are introduced by human activities, including:
  • Industrial Discharge: Untreated industrial effluents release heavy metals (i.e., lead, cadmium, chromium, and mercury), and toxic chemicals that may migrate into groundwater.
  • Agricultural Run-off: When fertilizers, pesticides, and herbicides are overused, they can leach harmful chemicals, especially nitrates, into the water table.
  • Urbanization and Waste Management: Leaky sewage systems and improper solid waste disposal associated with urbanization and landfilling can produce leachate, which contaminates groundwater.
  • Salt Water Intrusion: When groundwater is over-pumped in coastal areas, this allows for saltwater intrusion, thereby making it unusable.

Chronic illnesses linked to groundwater contamination

Exposure to contaminated groundwater, even at low levels, over prolonged periods can contribute to a range of debilitating chronic illnesses.

• Cancer: Arsenic is a known human carcinogen and has been linked to skin, bladder and lung cancers; other heavy metals (lead and cadmium) have also been associated with some cancers and Bangalore has documented cancer risk with heavy metal groundwater contamination.  
• Fluorosis: Ingesting high fluoride levels produces both skeletal and dental fluorosis (which includes painful stiff joints, bone deformities, and stunted growth mainly in children) impacting millions of people throughout India.  
• Methemoglobinemia (“Blue Baby Syndrome”): Infants are at the greatest risk of exposure to high nitrate levels in their drinking water. Nitrates can impact hemoglobin, decreasing the molecule’s  capacity for oxygen transport, which can be deadly to the infant. 
• Kidney Damage: Uranium toxicity has its greatest impact in the kidneys and leads to chronic kidney disease.
• Neurological Disorders: Some contaminants (arsenic, lead, mercury) affect the nervous system and could be factors in Parkinson’s Disease and Alzheimer’s Disease. 
• Reproductive Health Problems: Pesticides and heavy metals are associated with birth defects and infertility.
• Developmental Delays and Disorders: Children are especially susceptible to contaminants that can lead to developmental delays, anemia and cognitive impairment; especially heavy metals.

Addressing the crisis

• Stronger Regulatory Framework: Enacting and enforcing effective groundwater management regulations that set extraction limits, prevent overallocation/importation of water, and monitor extraction and source pollution from industries and agriculture, along with penalties to ensure ongoing compliance.
• Sustainable Agriculture: Enacting and promoting organic farming, precision irrigation systems (i.e. drip irrigation), and preventative measures for leaching from fertilizers and pesticides.
• Adequate Waste Management: Upgrading, improving and expanding waste management infrastructure in rural and urban facilities, including waste water treatment plants, and prevention/monitoring of leachate is critical to contaminating agricultural and drinking water.
• Encouraging Public Awareness and Participation: Public education on groundwater conservation measures, health costs to individuals, families and communities, and improving agriculture/public water supply includes providing knowledge on easy to adopt measures they can take.
• Technology: Advanced technology including Reverse Osmosis for treating contaminated water with the introduction of AI/IoT monitoring can not only provide forecasting and critical information for compliance, but also prompt responses to the risk of contamination.

Conclusion

Groundwater contamination poses a significant threat to public health in India, fueling a rise in chronic illnesses. Addressing this crisis requires a multi-pronged approach involving robust regulatory measures, adoption of sustainable practices across sectors, infrastructure development, and community engagement.

Source:  The Hindu

UPSC Mains Practice Question

Q. Discuss the major causes of groundwater pollution in India and analyse its linkages with the rising incidence of chronic illnesses. Suggest policy measures to mitigate the problem.

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