AccScience Publishing / AJWEP / Volume 22 / Issue 1 / DOI: 10.36922/ajwep.8142
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ORIGINAL RESEARCH ARTICLE

Assessment of groundwater quality in Patna district, Bihar, India, using the Water Quality Index method (Canadian Council of Ministers of the Environment method)

Bandana Mahto1 ,  Premlata Singh2* ,  Baboo Rai3
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1 Department of Civil Engineering, Birla Institute of Technology Mesra, Patna Campus, Patna, Bihar, India
2 Department of Mathematics, Birla Institute of Technology Mesra, Patna Campus, Patna, Bihar, India
3 Department of Civil Engineering, National Institute of Technology, Patna, Bihar, India
AJWEP 2025, 22(1), 134–148; https://doi.org/10.36922/ajwep.8142
Submitted: 23 December 2024 | Accepted: 4 March 2025 | Published: 20 March 2025
© 2025 by the Author(s).. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

 In this study, we assessed the groundwater quality in Patna district, Bihar, India, using the Water Quality Index (WQI) method, specifically the Canadian Council of Ministers of the Environment approach. Secondary data from various agencies (2004 – 2020) were analyzed to evaluate physicochemical parameters and spatial-temporal trends. Results indicated that while most samples fell within the permissible limits, samples from some locations showed elevated pH, electrical conductivity, hardness, alkalinity, chloride, and nitrate, suggesting localized contamination from natural and anthropogenic sources. Piper diagram analysis reveals Ca²⁺-Mg²⁺-HCO₃− dominance, pointing to carbonate rock dissolution, with some influence from agricultural and industrial activities. WQI classification categorized 76% of samples as fair to excellent, whereas 24% were marginal to poor. A heatmap analysis highlighted an improvement in water quality after 2012, though water from some stations remained persistently poor. Quantum geographic information system-based spatial mapping using the inverse distance weighting technique effectively visualized pollution hotspots and safe water zones. In conclusion, findings from the study underscore the need for regular monitoring, pollution control, advanced treatment methods, and sustainable groundwater management to ensure safe drinking water.

 

 

Keywords
Groundwater
Contamination
Water quality index
Quantum geographic information system
Spatial mapping
Funding
None.
Conflict of interest
The authors declare they have no competing interests.
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Asian Journal of Water, Environment and Pollution, Electronic ISSN: 1875-8568 Print ISSN: 0972-9860, Published by AccScience Publishing
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