Water samples (n=131) were taken from 115 waterpoints in Polder 29 of Khulna district (Bangladesh) and tested at the Laboratory Environmental Health at the International Centre for Diarrhoeal Diseases (icddr,b) to understand seasonal variations in water quality across different water supply technologies. E.coli was test before and after decontamination of source outlet, along with analysis of vibrio cholerae, arsenic, iron, manganese, chloride, total dissolved solids, and turbidity across three seasons (Intermediate/winter - Jan 2020, Wet/monsoon - June 2020, Dry/summer - March 2021). The sample includes a variety of private, community and school waterpoints, including tubewells, pond sand filters, reverse osmosis plants, piped water schemes and managed aquifer recharge sites. The dataset was used in the following publications: a) Hope et al. (2021). Policy reform for safe drinking water service delivery in rural Bangladesh. REACH Working Paper 9. University of Oxford, UK. http://dx.doi.org/10.5287/ora-e9x2onovo. b) Shamsudduha M. & Hoque, S. (2024). Water risks and rural development in Coastal Bangladesh at this link: https://oxfordre.com/environmentalscience/display/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-831
