This data are part of PhD project of D. Daniel and supervised by Dr. Saket Pande and Prof. Luuk Rietveld. The study is about the household water treatment behaviour in 2 rural areas in Indonesia: Palu and Sumba. There are about 202 and 370 households were interviewed in Palu and Sumba, respectively. The baseline study was conducted in June – August 2018 in both locations and follow-up study in 2019, but only in Sumba