Assistant Professors – Dr Kousik Das, Dr Harish Puppala, Associate Professor- Dr Pankaj Pathak, Uttiya Dey, along with Research Scholars – Mr Mijanur Mondal, Ms Sudeshna Chell, Ms Sumana Dutta, and Ms Pankaj Kumar come up with an interdisciplinary research breakthrough in their paper, “Community-Level Vulnerability of Groundwater Fluoride Contamination and Exposure by the Application of Multi-Criteria Model.” The authors examine fluoride exposure in villages like Chintal Cheruvu, Rompicherla, Shantamangalur, Thimmapur, and Nadendla.

Abstract

Elevated fluoride (F⁻) levels in groundwater, primarily due to geogenic processes, pose significant health risks, including dental and skeletal fluorosis and neurological disorders. This study aimed to quantify source-dependent F⁻ exposure at the community level in selected tropical dry regions of Andhra Pradesh, India. These locations include Chintal Cheruvu, Rompicharala, Shantamangalur, Thimmapur, and Nadendla. Community surveys and drinking water sample analyses were conducted in these regions. Dental Fluorosis Index (DFI) used to estimate exposure levels across age and sex groups. Findings of surveys indicate that groundwater consumption with high F⁻ (4.3 mg/L) results in the highest exposure dose (0.62 mg/kg/day), with Chintal Cheruvu identified as the most affected. A strong positive correlation was observed between exposure dose, water F⁻ content, and the Community Fluorosis Index (CFI). Dental fluorosis prevalence exceeded 80% across all age groups, and household surveys revealed 100% unawareness of F⁻ exposure risks. The magnitude of FII for Chintal Cheruvu is 0.563 which is highest among the considered regions indicating that it is most impacted region that needs remedial measures first in the hierarchy. Rompicharala with FII as 0.252, Nadendla (0.223), Shantamangalur (0.214), and Thimmapur (0.188) follows the hierarchy.

Explanation in layperson’s terms.

The outcome of the study concludes that regionally most of the places of Andhra Pradesh is affected the by the groundwater fluoride contamination. People are getting affected by the consumption of high fluoridated water which is visible from the dental fluorosis. The area is having high groundwater fluoride is having highest severe dental fluorosis cases. Among the villages, Chintal Cheruvu had the highest fluoride level while Thimmapur had the lowest. Signs of dental fluorosis were most noticeable among younger individuals who are still developing. The exposure dose varied across villages, with Chintal Cheruvu having the highest exposure dose followed by Rompicharala. Other symptoms of fluorosis, such as skin allergies and body pain are also predominant. Most villages had alternative sources of drinking water, except for Chintal Cheruvu, where residents continued to use contaminated water due to a lack of alternatives. There is a clear link between lack of awareness about fluoride toxicity and higher exposure levels as apparent from the questionnaire survey.

Practical /Social Implications

The immediate action is necessary to reduce fluoride exposure, provide safe drinking water, and raise awareness about fluoride toxicity to meet sustainable development goals by 2030. The findings highlight the need for integrated approaches combining mitigation, education, and sustainable practices to tackle fluoride contamination and improve the overall well-being of affected communities.

The link to the article

The water crisis in India, especially in the coastal regions, has worsened alarmingly, coercing environmentalists and researchers to critically study the reason behind this phenomenon. The Sundarbans region faces a scarcity of drinking water in terms of quality and quantity due to various reasons. Dr Kousik Das, Asst. Professor, Department of Environmental Science and Engineering, Dr Harish Puppala, Asst Professor, Department of Civil Engineering and Mr Mijanur Mondal, Research Scholar from the Department of Environmental Science and Engineering has conducted a groundbreaking study on the increased salinization of water due to human activities. The research trio has published a paper titled “Understanding the susceptibility of groundwater of Sundarbans with hydroclimatic variability and anthropogenic influences” in the prestigious Q1 journal Groundwater for Sustainable Development, which has an impact factor of 5.9, critically analysing the numerous factors that affect the quality of drinking water in the Sundarbans region.

Abstract

Coastal aquifers worldwide are experiencing increased salinisation due to climate change and human activities. Sundarbans, in India, is one such area where this phenomenon is noticed at an unprecedented rate, making drinking water unpotable for consumption. Existing studies lack a comprehensive analysis of the underlying causes. This study conducts a systematic literature review to identify drivers of groundwater salinisation, examining climate change parameters such as rainfall patterns, sea level rise, El Niño-Southern Oscillation, and tropical cyclones. Significant groundwater level declines from 1996 to 2017 are primarily attributed to variations in the Indian Ocean Dipole and El Niño Southern Oscillation, affecting rainfall and recharge rates. During tropical cyclones, groundwater levels rise rapidly, and quality is sensitive to El Niño Southern Oscillation. Rising sea levels, changing rainfall, and increasing population density worsen salinisation. Shallow aquifers have high salinity, whereas deep aquifers exceed permissible limits. This underscores the urgent need to address drinking water scarcity and potential migration resulting from complex interactions between climate, population, and groundwater management.

Social Implications of the Research

• Water Quality Monitoring: Implementing regular monitoring of salinity levels in groundwater to ensure compliance with safety standards.
• Community Awareness Programmes: Conducting educational campaigns to inform local communities about the risks of high salinity levels in drinking water and promoting the judicious use of water sources so that unscientific abstraction can be reduced.
• Policy Development: Formulating policies at the local and national levels to regulate salinity levels in drinking water and ensure public health protection.
• Infrastructure Improvement: Investing in water treatment facilities or technologies to remove high salt levels from groundwater sources. Alternative sources and rainwater harvesting can be taken into consideration.

Collaborations – IIT Kharagpur, India

The research team plans to work on Groundwater vulnerability modelling using AI/ML in Sundarbans, India next. The team has begun collecting primary data using questionnaire surveys and interviews to throw light on socio-economic conditions and to understand the core reasons for the water crisis and health and psychological issues due to water unavailability, especially during extreme events like cyclones.

Link to the article