This data set comprises a questionnaire survey and results of microbiological water quality testing, which were conducted through a post-hoc impact evaluation study of the delegated management model (DMM) of water service delivery in the city of Kisumu, Kenya. Under DMM, a water utility passes on responsibility to a micro-enterprise or community group for local water service delivery within a low-income neighbourhood. The micro-enterprise or community group takes on the financial and operational management of water infrastructure within this local area. The aim of this study was to evaluate DMM’s impact on water safety among consumers of water sold by kiosks. The data set comprises questionnaires administered to water vendors, both kiosk operators and water hand-cart operators, within DMM areas and matched control areas within Kisumu. These questionnaires cover respondent socio-demographic characteristics, business finances, operation and water prices, water supply interruptions, treatment and storage facilities. Questionnaire interviews were also conducted with households purchasing water from these businesses. These questionnaires also cover socio-demographic and housing characteristics of these households, together with water prices, handling and treatment alongside sanitation, solid waste and hygiene provision. Water samples were taken from kiosks, hand-carts, pipelines, and from household stored water. The data set thus also includes microbiological (e.g. thermotolerant coliform) and chemico-physical parameters (e.g. free residual chlorine) for these water samples.According to WHO/UNICEF, whilst 91.8% of urban households in Sub-Saharan Africa (SSA) had access to piped or protected groundwater sources in 2015, only 46.2% had safely managed water available when needed. Vendors provide a key role in supplying urban off-grid populations, with consumption of bottled or bagged water (sachets, water sold in 500ml plastic bags) growing in SSA. Whilst several studies show bottles and bags are usually free from faecal contamination, given that many off-grid urban populations lack solid waste disposal services, when people drink such water, there can be problems disposing of the plastic bags and bottles afterwards. This project aims to deliver evidence on the different ways that people sell water to off-grid populations and what this means for plastic waste management. We plan to do this in Ghana, where most urban household now drink bagged water, and by way of contrast, Kenya, where the government has banned plastic bags. In this way, we want to widen access to safe water and waste management services among urban off-grid populations, by supporting water-sellers and waste collectors to fill the gaps in municipal services. Both countries (and many others elsewhere) already have nationwide household surveys that collect data on the food and goods people consume and the services they have. However, as yet, these surveys have not been connected to the problem of waste management. We plan to visit marketplaces, buying foods and then recording packaging and organic waste. By combining this information with the household survey data, we can work out how much domestic waste like plastics gets collected and how much is discarded or burned, ultimately entering the atmosphere or oceans. In Ghana, we will also survey informal waste collectors in urban Greater Accra. We want to find out how much these small businesses support waste collection and recycling across this urban region (particularly plastic from bagged water), so we can help government identify gaps in waste collection coverage. We also believe highlighting the important role of small waste collectors could lead to greater business support for such collectors. We will also evaluate whether community education campaigns to encourage domestic waste recycling reduce the amount of waste and plastic observed in the local environment. Such campaigns are currently pursued by several local charities with support from the Plastic Waste Management Project. In Kenya, where water is usually sold in jerrycans rather than bagged, the jerrycan water often gets contaminated. We plan to find out whether this jerrycan water is safer under an arrangement known as delegated management. This involves a water utility passing on management of the piped network to a local business in slum areas, so as to reduce vandalism of pipes and bring water closer to slum-dwellers. We will compare water quality in areas with and without this arrangement to see if it makes the water sold safer. We also plan to bring water-sellers and consumers together to find and test ways of reducing contamination of water between a jerry-can being filled and water being drunk at home. Rather than imposing a solution, we want to work together with vendors and consumers on this issue, but there are for example containers designed to keep water cleaner that we could explore. Through these activities, we thus plan to develop evidence on different strategies for water-sellers to deliver safer water to people lacking piped connections, whilst managing plastic waste at the same time. In Ghana, this involves trying to increase recycling and waste collection for bagged water, which is relatively safe. In Kenya, this involves trying to reduce contamination of water sold in reusable jerrycans. Alongside our household survey evidence on how domestic waste is managed in slums, this should help governments plan waste and water services in poorer areas of Africa's expanding cities.

The data were collected at a single time-point following implementation of Kisumu’s Delegated Management Model programme via a post-hoc impact evaluation study. Via random sampling, the study selected enumeration areas where water services were delivered through the Delegated Management Model together with matching control enumeration areas, also supplied with piped water but directly by the water utility. Questionnaire surveys were then administered with water kiosk operators within these selected areas via computer-assisted interviews and water samples collected from each kiosk. Water vendors with handcarts and households purchasing water from selected kiosks were then recruited to the study. Questionnaire surveys were again administered to these respondents via computer-assisted interviews and samples taken of hand-cart water or water stored in the home. Barcode labels were used to track water samples, which were tested for residual free chlorine in situ using strip tests. Water samples were transported under ice to a laboratory, where membrane filtration was used to enumerate total and faecal coliforms in each sample.