Safe at the Source, Not Always Safe at Home: New Data Tracks Drinking Water Contamination

1 October 2026

Water collected from a borehole, protected spring or piped supply may be safe when it leaves the source but what happens on the journey to the household can change that.

 

New World Bank data shows that contamination can enter drinking water during collection, transport, storage and everyday handling, meaning that access to an improved water source does not always guarantee that the water eventually consumed is safe.

 

The analysis, published on 8 September 2026 as part of the Atlas of Global Development 2026, reports that 2.1 billion people worldwide still lack safely managed drinking water. More striking is the difference between water tested at the source and the same supply assessed where people actually use it. In 28 of 30 countries with comparable data, a larger share of people was exposed to contamination when water was tested at household level than at the original source.

 

Contamination can be introduced through something as ordinary as an uncovered storage container, an unwashed cup or a hand dipped into stored water. The problem therefore extends beyond the condition of a borehole, tap or spring. It includes what happens after the water has been collected.

 

That distinction matters because international standards for safely managed drinking water consider more than the type of source being used. Water should be accessible on the premises, available when needed and free from contamination. The World Bank analysis identifies water quality as one of the most difficult barriers to meeting that standard.

 

Uganda is dealing with the same problem while making progress in some areas of water-quality management.

The Fourth National Development Plan 2025/26–2029/30 reports that compliance with drinking-water quality standards for point water sources improved from 41 per cent in 2017/18 to 55 per cent in 2023/24. Compliance for piped water increased from 60 per cent to 71 per cent over the same period. The Plan, however, also reports that more than 80 per cent of urban water sources are contaminated, with untreated waste, indiscriminate disposal of plastics and other pollutants contributing to the problem.

 

Uganda's response increasingly depends on better monitoring as well as infrastructure. NDP IV includes stronger enforcement against water pollution, improvements in hydrological information systems and plans to construct and equip a National Water Quality Reference Laboratory. Academia is among the actors identified in the Plan's approach to sustainable water-resource management.

 

Research at Busitema University already shows how some of those questions can be approached.

In 2026, Joseph Pelerino Lolem, working in the Department of Water Resources Engineering, developed a hybrid model for predicting river-water quality in Uganda's Malaba River catchment. The study combined the Soil and Water Assessment Tool with an artificial neural network using hydrological, climate, land-use and pollution data. The artificial neural network achieved 84.47 per cent accuracy in classifying water quality, with sediment and turbidity emerging as important drivers.

 

Another study by Sonia Dorothy Baaya in 2024 took a different approach. She designed and constructed a cost-effective Internet of Things-based water-quality monitoring system at Busitema University. The system was developed to collect and transmit water-quality data in real time, allowing changes to be detected more quickly than approaches that depend only on periodic laboratory testing.

 

The latest global findings add another layer to work of this kind. Knowing whether a river, borehole or piped supply is contaminated remains important, but the evidence raises questions about what happens after water leaves those sources.

 

Where along the journey from collection to consumption does contamination enter? How much do storage containers, transport methods and household handling affect water quality? Which communities face the greatest exposure? Can low-cost monitoring technologies identify changes early enough to prevent people from consuming unsafe water?

 

These are questions that can bring together expertise already found across Busitema University, including water engineering, environmental science, public health and data science. They also create room to move research closer to households and communities, where the difference between water that is available and water that is actually safe becomes visible.

 

That direction fits within Busitema University's wider research agenda. The University identifies Health and Wellbeing and Agriculture and Environment among the themes around which it seeks to build high-impact research, alongside Digital Futures and Transformative Technologies. Its strategic plan also places emphasis on research that produces scientific and social impact within communities.

 

The figures shift attention from the water point to everything that happens afterwards. A borehole may test clean in the morning and still fail to deliver safe water to the person drinking from a household container later that day. Finding where that safety is lost, and how to prevent it, is now part of the water challenge.

 

Read the original World Bank article, Water quality: safe at the source isn't safe at the glass.