Drinking Water Safety: Role of Hand Hygiene, Sanitation Facility, and Water System in Semi-Urban Areas of India

Arti Kundu School of Veterinary Medicine, One Health Institute, University of California, Davis, California;

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Woutrina A. Smith School of Veterinary Medicine, One Health Institute, University of California, Davis, California;

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Danielle Harvey Department of Public Health Sciences, School of Medicine, University of California, Davis, California;

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Stefan Wuertz Department of Civil and Environmental Engineering, University of California, Davis, California;
Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore;
School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore

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Poor drinking water quality is one of the main causes of acute diarrheal disease in developing countries. The study investigated the relationship between fecal contamination of hands, stored drinking water, and source waters in India. We further evaluated the environmental and behavioral factors associated with recontamination of water between collection and consumption. The bacterial contamination, that is, Escherichia coli (log10 most probable number per two hands), found on mothers’ hands (mean = 1.11, standard deviation [SD] = 1.2, N = 152) was substantially higher than that on their children younger than 5 years (mean = 0.64, SD = 1.0, and N = 152). We found a low level of E. coli (< 1 per 100 mL) in the source water samples; however, E. coli contamination in stored drinking water was above the recommended guidelines of the World Health Organization. The study also found that E. coli on hands was significantly associated with E. coli in the stored drinking water (P < 0.001). Moreover, E. coli was positively associated with gastrointestinal symptoms (odds ratio 1.42, P < 0.05). In the households with elevated levels (> 100 E. coli/100 mL) of fecal contamination, we found that 43.5% had unimproved sanitation facilities, poor water handling practices, and higher diarrheal incidences. The water quality deterioration from the source to the point of consumption is significant. This necessitates effective interventions in collection, transport, storage, and extraction practices when hand–water contact is likely to occur. These findings support the role of hands in the contamination of stored drinking water and suggest that clean source water does not guarantee safe water at the point of consumption.

Author Notes

Address correspondence to Woutrina A. Smith, School of Veterinary Medicine, One Health Institute, 1089 Veterinary Medicine Dr., University of California, Davis, CA 95616. E-mail: wasmith@ucdavis.edu

Financial support: This project was supported by NIH Research Training Grant #R25 TW009343 funded by the Fogarty International Center, the NIH Office of the Director Office of AIDS Research, the NIH Office of the Director Office of Research on Women’s Health, the NIH Office of the Director Office of Behavioral and Social Science Research, the National Institute of Mental Health, and the National Institute on Drug Abuse, as well as the University of California Global Health Institute.

Authors’ addresses: Arti Kundu, Department of Veterinary Medicine and Epidemiology, University of California, Davis, CA, E-mail: akundu@ucdavis.edu. Woutrina A. Smith, Veterinary Medicine and Epidemiology Department, School of Veterinary Medicine, University of California at Davis, CA, E-mail: wasmith@ucdavis.edu. Danielle Harvey, Department of Public Health Sciences, School of Medicine, University of California, Davis, CA, E-mail: djharvey@ucdavis.edu. Stefan Wuertz, Department of Civil and Environmental Engineering, University of California, Davis, CA, Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore, and School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore, E-mail: swuertz@ucdavis.edu.

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