Groundwater Quality Across India: CGWB Releases Comprehensive Annual Report

The Ministry of Jal Shakti, Government of India, has released the Annual Groundwater Quality Report 2024, prepared by the Central Ground Water Board (CGWB). The report consolidates data from 15,259 monitoring locations across the country, offering vital insights on water quality parameters critical for both drinking and agricultural needs.

Key Highlights of the Report

1. Uniform Methodology and SOP
   According to the CGWB, this year’s monitoring exercise adhered to a newly introduced Standard Operating Procedure (SOP), ensuring consistency and scientific rigor in the sampling process. This uniform approach allows better comparison of data across states and over time.
2. Overall Findings
   • Nitrate Exceedances: Approximately 19.8% of the tested samples contained Nitrate levels above the permissible limit of 45 mg/L. Elevated Nitrate levels can pose health risks including methemoglobinemia (commonly known as “blue baby syndrome”) and can harm crops if used for irrigation without proper treatment.
   • Fluoride Concerns: Around 9.04% of samples recorded Fluoride levels exceeding 1.5 mg/L. Prolonged consumption of water with high Fluoride can cause dental and skeletal fluorosis.
   • Arsenic Detection: In 3.1% of samples, Arsenic levels were higher than 10 ppb (parts per billion). Long-term exposure to high Arsenic concentrations can lead to serious health conditions, including various cancers.
   • Uranium Presence: Of the samples tested for Uranium, 6.6% exceeded 30 ppb, particularly in some pockets of the country. Elevated Uranium in groundwater can lead to both chemical toxicity and radiological risks.
3. Highly Affected Pockets
   • Rajasthan and Haryana: These states revealed some of the highest incidences of Fluoride and Nitrate exceedances in certain districts, indicating an urgent need for targeted mitigation measures.
   • Andhra Pradesh, Karnataka, and Telangana: These southern states also faced notable challenges with both Nitrate and Fluoride, pointing to region-specific hydrogeological issues that may require careful aquifer management.
   • Bihar, Punjab, and Uttar Pradesh: These states witnessed Arsenic contamination in several districts—significant given long-standing concerns about Arsenic in the Indo-Gangetic plains.
   • Punjab, Haryana, and Rajasthan: Emerging concerns about Uranium contamination were most pronounced here, where some districts recorded higher-than-permissible levels.
4. Areas with Safe Levels
   In contrast, several regions demonstrated excellent water quality. Arunachal Pradesh, Mizoram, Meghalaya, and Jammu & Kashmir reported no samples exceeding permissible limits for the monitored contaminants, underscoring the importance of preserving these relatively pristine aquifers through proactive management.

State-Wise Insights

• Rajasthan: With around 49.52% of samples showing Nitrate above permissible limits and 43.17% exceeding Fluoride standards, Rajasthan ranks among the states most affected by these contaminants.
• Karnataka: Nearly 48.99% of samples showed higher Nitrate levels, followed by considerable Fluoride presence (17.68%).
• Punjab: While Nitrate contamination was moderate, the state stands out for 32.6% of tested samples exceeding safe Uranium limits—a concern that demands immediate attention.
• Bihar: Although Nitrate and Fluoride are less frequent here, 11.9% of samples reported Arsenic contamination.
• Uttar Pradesh: India’s most populous state reported 6.7% of samples above Arsenic limits and 8.3% above Uranium limits, potentially impacting a large number of residents.

Policy Measures and Ongoing Initiatives

1. Arsenic-Free Wells and Cement Sealing Technology
   The CGWB has implemented a novel cement sealing method to construct Arsenic-free wells in hotspots, preventing contamination from shallow aquifers. This technology is also being explored for mitigating Fluoride intrusion in certain regions.
2. National Aquifer Mapping Programme (NAQUIM)
   Under NAQUIM, aquifer studies factor in contamination levels of toxic substances like Arsenic and Fluoride. The findings guide state-level interventions for aquifer protection and targeted remediation.
3. Regulatory Enforcement
   The Central Pollution Control Board (CPCB), in collaboration with State Pollution Control Boards (SPCBs) and Pollution Control Committees (PCCs), enforces the Water (Prevention & Control) Act, 1974, and the Environment (Protection) Act, 1986. These agencies regulate effluent discharges, helping curb point-source pollution of groundwater.
4. Jal Jeevan Mission (JJM) – Har Ghar Jal
   A flagship program by the Ministry of Jal Shakti, JJM aims to provide safe and potable water to every rural household by 2024. Adhering to BIS:10500 standards, JJM allocates additional funding to states with higher populations in contaminant-affected areas, ensuring critical support where it is needed most.
5. Alternative Safe Water Sources
   In villages experiencing water quality issues, states and UTs have been advised to develop piped supply networks reliant on surface water sources or deeper, uncontaminated aquifers. This initiative helps ensure communities avoid polluted groundwater in their daily lives.
6. Groundwater Recharge and Conservation
   Recognizing the vital role of recharge in diluting contaminants and replenishing depleted aquifers, the government has introduced multiple schemes such as Jal Shakti Abhiyan, PMKSY-Watershed Development, MGNREGA, and the Atal Bhujal Yojana. These programs encourage rainwater harvesting, watershed management, and artificial recharge to improve both the quantity and quality of groundwater.