Groundwater quality concerns in India: contamination hotspots and emerging risks

Introduction

Recent findings from the Annual Ground Water Quality Report 2025 by the Central Ground Water Board highlight a paradox in India’s groundwater scenario—while most regions report “good to excellent” quality, several states such as Andhra Pradesh, Rajasthan, Haryana and Punjab face widespread contamination and localized hotspots. The issue has critical implications for public health, agriculture, and water security.

ANALYSIS

Overall Status of Groundwater Quality

The national assessment indicates that nearly 71–72% of groundwater samples comply with BIS standards, reflecting an overall acceptable quality. However, around 28–30% samples exceed permissible limits, pointing towards localized contamination pockets rather than uniform degradation.

Major Contaminants and Regional Patterns

The report identifies multiple contaminants, each with distinct spatial patterns and causes:

• Nitrate contamination (most widespread)
  • Found in ~20.7% samples exceeding limits
  • Concentrated in northwestern and central India (Rajasthan, Haryana, Punjab, MP)
  • Linked to excessive fertiliser use, sewage leakage, and agricultural runoff
• Fluoride contamination
  • High in arid and semi-arid regions (Rajasthan, Gujarat, AP, Telangana)
  • Causes fluorosis (dental and skeletal disorders)
• Uranium contamination (critical concern)
  • Safe limit: 30 ppb
  • Punjab recorded 62.5% exceedance (highest in India)
  • Also found in Haryana, Delhi, AP, Telangana
  • Associated with geogenic factors and groundwater depletion
• Arsenic contamination
  • Concentrated in Indo-Gangetic plains
  • Major health hazard due to long-term toxicity
• Electrical Conductivity (EC) / Salinity
  • High EC indicates salinity and seawater intrusion
  • Coastal regions like Andhra Pradesh affected
  • Impacts drinking water quality and agriculture

Case Study: Andhra Pradesh

The report flags Andhra Pradesh as a multi-contamination hotspot:

• Seawater intrusion in coastal aquifers due to high EC
• Fluoride enrichment in hard rock aquifers aggravated by over-extraction
• Residual Sodium Carbonate (RSC) exceeding limits (~26.87%) affecting soil health
• Presence of uranium (>30 ppb) and arsenic hotspots in specific villages

Notably, monsoon recharge temporarily improves water quality, indicating the role of natural dilution mechanisms.

Emerging Patterns and Causes

The contamination trends reflect both natural (geogenic) and human-induced (anthropogenic) factors:

• Geogenic factors: Uranium, arsenic due to rock-water interaction
• Anthropogenic factors:
  • Intensive agriculture and fertiliser use
  • Industrial discharge and sewage leakage
  • Over-extraction of groundwater, leading to salinity intrusion

Implications

The issue has multi-dimensional consequences:

• Public Health: Fluorosis, cancer risks (arsenic, uranium), kidney and neurological disorders
• Agriculture: Soil degradation due to salinity and RSC → reduced productivity
• Water Security: Declining potable water availability
• Regional Inequality: Northwest and coastal regions more vulnerable

Static Part

Central Ground Water Board (CGWB)

• Established: 1970
• Ministry: Ministry of Jal Shakti
• Headquarters: Faridabad, Haryana
• Functions:
  • Groundwater monitoring and assessment
  • Quality analysis and reporting
  • Policy support for sustainable groundwater management

Report Mentioned

• Annual Ground Water Quality Report 2025
  • Covers pre- and post-monsoon data (2024)
  • Assesses parameters like nitrate, fluoride, uranium, EC, arsenic

Conclusion

India’s groundwater scenario reflects a dual reality—overall adequacy with critical regional vulnerabilities. The findings underline the urgent need for localized mitigation strategies, sustainable groundwater extraction, and stricter pollution control, ensuring long-term water security and public health protection.

Updated - 11 January 2026; 07:40 PM | The Hindu,TOI ,The New Indian Express , Deccan herald