en Environmental Health, Sciences, and Engineering Environmental Health, Sciences, and Engineering Short communication <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;"><strong>Background:</strong> Wells are the main source of water supply in rural areas. Bleaching powder is the most effective and inexpensive method for well water disinfection. In the great floods of 2018 in South India, community volunteers (ASHA) were trained on promoting preventive measures (e.g., well water chlorination) and use of boiling water.<br> <strong>Methods:</strong> This cross-sectional survey was conducted on 101 households in the field practice area of the Rural Health Training Center of a teaching institution in Central Kerala affected by flood to assess the extent of the correct method of well water disinfection during September 2-12, 2018.<br> <strong>Results:</strong> All the wells were disinfected by chlorination using bleaching powder, and most of the wells (86%) were super-chlorinated. To determine the amount of the required bleaching powder, the well water volume was calculated by guesswork in 91 households (89%). All the households used a bleaching powder solution rather than directly sprinkling the powder.<br> <strong>Conclusion:</strong> According to the results, effective health awareness campaigns, community participation, and the use of appropriate technologies could change the behavior of the community. All the households practiced well water disinfection with some minor lacunas.</span></span></div> Well water disinfection, Calamities, Kerala, Perception, Lacuna, Chlorination 97 100 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-372-1&slc_lang=en&sid=1 Joyal Alias Saji joyalaliassaji@gmail.com 10031947532846009957 10031947532846009957 No Community Medicine Department, Believers Church Medical College, St. Thomas Nagar, Kuttapuzha, Thiruvalla, South India. 689103. Abel K Samuel Johnson abelksj@gmail.com 10031947532846009958 10031947532846009958 Yes Community Medicine Department, Believers Church Medical College, St. Thomas Nagar, Kuttapuzha, Thiruvalla, South India. 689103. Koshy M. Cherian koshymc@gmail.com 10031947532846009959 10031947532846009959 No Community Medicine Department, Believers Church Medical College, St. Thomas Nagar, Kuttapuzha, Thiruvalla, South India. 689103.