The impact of preventive chemotherapy project was a study to determine the perception and knowledge, attitudes and practices (KAP) on Zimbabwe’s national helminth control programme conducted between 2012 and 2017. It focused on schistosomiasis (a parasitic disease affecting tropical and subtropical communities without access to safe drinking water and adequate sanitation provision) in the school children treated with the antihelminthic drug praziquantel, as well as schoolteachers and village health workers (VHW). School children (n= 409) from Grades 6 and 7 who had the full benefit of the 6 years of MDA from 2012 to 2017 were recruited, in addition to 36 schoolteachers and 22 VHW who were serving the schools. A structured questionnaire developed in English, translated into the local language Shona, and validated prior to the study was administered to all participants. The questions focused on the perceived impact of the preventive chemotherapy programme for schistosomiasis on individual/overall health, school attendance and performance, as well as KAP. Data were captured electronically on android platforms using the Open Data Kit. Full details are given in Mutapi et al., 2020 (Title: Positive impact of preventative chemotherapy during a national helminth control program: perception and KAP)File name: Impact_survey outcome data.xlsx Description: This includes the full outcome data for the study. File name: Impact Survey Data Dictionary.xlsx Description: This is a data dictionary describing each variable its associated codes and a summary of values for each variable