“A South African environmental-health study involving 533 children in three Western Cape agricultural areas found that household pesticide use and agricultural spray drift were associated with higher levels of pesticide-related chemicals in children’s urine. Researchers stress that the study demonstrates measurable exposure rather than proving that the pesticides caused illness, while calling for stronger monitoring, safer handling practices, and greater attention to exposure pathways around homes and farms.”
A new South African environmental-health study has found that children living in three Western Cape agricultural areas showed measurable pesticide exposure associated with both household pesticide use and pesticide spray drift. The research, involving 533 children and 1,814 urine samples, adds evidence that pesticide exposure can cross the boundary between farms and homes, while the researchers stress that the study did not determine whether the exposure caused illness.
The University of Cape Town reported the findings on 25 September 2026, making this the latest qualifying South African Environment-under-Sci-Tech story I could verify in the sources searched. I could not verify a South African Environment-under-Sci-Tech report dated 26 September 2026, so I am using the 25 September study rather than presenting an older story as if it were published today.
Researchers from the University of Cape Town, the Swiss Tropical and Public Health Institute, the University of Basel and Lund University examined children aged nine to 15 in Grabouw, Piketberg and the Hex River Valley. The study formed part of the Child Health Agricultural Pesticide Study in South Africa and followed participants over two years. Researchers collected urine during five sampling rounds and measured 14 biomarkers, which are chemical indicators that can reveal relatively recent exposure to pesticides.
The results point to several routes of exposure. Recent household pesticide use was associated with increases of up to 57% in the levels of 12 pesticide biomarkers. Recent exposure to agricultural spray drift was associated with increases of up to 30% in eight biomarkers. More than 60% of the children reported noticing pesticide spray drift from nearby application sites during the previous seven days in the sampling rounds, while about 60% reported recent household pesticide use in four of the five rounds.
The findings matter because children do not necessarily need to work directly with agricultural chemicals to encounter them. In farming communities, homes, schools, fields, storage areas and transport routes can be closely connected. Pesticides may move through the air during spraying, be carried indoors on clothing or equipment, be used in homes for pest control, or enter household environments through informal products. The study also found differences linked to drinking-water sources: children in households using open water sources had higher levels of some pesticide biomarkers than children using closed sources such as taps, boreholes or bottled water.
The researchers caution, however, against turning evidence of exposure into a claim of proven illness. Professor Mohamed Aqiel Dalvie, a co-author and director of UCT’s Centre for Environmental and Occupational Health Research, said the analysis did not investigate whether pesticides caused illness in the children. Urine testing mainly captures relatively recent exposure because many of the chemicals examined are eliminated from the body comparatively quickly.
That distinction is important for environmental science reporting. Finding a chemical biomarker shows that exposure occurred; it does not by itself establish the dose received over a lifetime, a specific disease outcome, or a direct cause-and-effect relationship. The study nevertheless provides information that can help researchers identify where exposure is occurring and which circumstances deserve closer monitoring.
The research also highlights the importance of timing. The investigators found that recent exposure factors were generally more consistently associated with pesticide biomarkers than factors showing whether a child had ever experienced a particular exposure. Regina Molomo, the study’s first author and a PhD student in epidemiology at Swiss TPH, said questions about what happened in the days immediately before urine collection may provide a more useful picture than relying only on long-term recall.
The study is particularly relevant to South Africa because agricultural production is economically important and many rural and peri-urban communities live close to cultivated land. Forty percent of the children in the study lived on farms, while 80% had at least one family member working on a farm. That overlap makes the conventional division between occupational and household exposure less clear.
The findings also show why environmental reporting needs careful language. Pesticide exposure is measurable and important, but risk depends on factors such as chemical identity, concentration, frequency, route of exposure and individual circumstances. Clear distinctions between exposure, hazard and demonstrated health effects can help readers understand the evidence without alarm.
The researchers therefore point toward stronger controls on spray drift, safer pesticide handling and targeted education for farming households. They also support routine biomonitoring and environmental monitoring to better understand exposure pathways.
Water pollution is another part of this picture. Research discussed by Wits University found microplastics in all nine sacred freshwater springs tested in the Eastern Cape and KwaZulu-Natal, with 184 particles detected at concentrations ranging from five to 48 particles per litre. The researchers described the results as baseline evidence rather than proof that the water is unsafe, underscoring the same scientific principle present in the pesticide study: detecting contamination is not identical to demonstrating a health outcome.
The pesticide findings also sit within a longer history of research on agricultural exposure in the Western Cape. Earlier studies investigated pesticide residues around schools and agricultural areas, while the new longitudinal research provides more detailed information about behavioural and environmental factors associated with urinary biomarkers. Its contribution is therefore not simply that pesticides were detected, but that researchers examined the circumstances surrounding recent exposure.
For families in agricultural communities, the findings raise practical questions about how pesticides are stored, transported, applied and used around homes. For farmers, spray operators and regulators, they reinforce the importance of application practices that limit off-target movement. For scientists, they show the value of combining biomonitoring with information about household behaviour, agricultural activity and water sources.
The researchers also emphasise that pesticide exposure can have multiple sources. Agricultural chemicals may be brought into homes, household pest-control products may contribute to exposure, and pesticides obtained through informal markets may create additional pathways. That complexity means that reducing exposure is unlikely to depend on a single intervention.
The wider South African environmental picture also includes questions about infrastructure, pollution and environmental regulation. Eyewitness News reported on 25 September that parliamentary committees were seeking answers about environmental compliance at Eskom’s Kusile Power Station following a Supreme Court of Appeal judgment concerning environmental authorisations and water-use licence conditions. The committees raised concerns about groundwater contamination, pollution-control dams and stormwater management.
GroundUp, meanwhile, reported on a proposed 37-turbine wind farm near Makhanda, where questions have been raised about jobs, community benefits, ownership and environmental impacts. The debate illustrates another dimension of environmental science in South Africa: technological and infrastructure projects can create potential environmental benefits while also requiring detailed assessment of their local effects.
Taken together, these developments show why environmental science increasingly depends on evidence collected at community level. Whether the issue involves pesticide biomarkers, microplastics in freshwater, power-station pollution or renewable-energy infrastructure, researchers need reliable measurements to understand what is happening before policymakers and communities can assess appropriate responses.
For South Africa, the new pesticide study offers a detailed snapshot of exposure among children in three Western Cape farming areas. It does not establish that the measured exposure caused disease, but it does demonstrate that environmental pathways deserve attention. By identifying recent household pesticide use, spray drift and water sources as factors associated with measurable biomarkers, the research provides evidence that can guide further investigation and prevention.
The next step is therefore not to draw conclusions beyond the data, but to use the evidence to improve monitoring and reduce avoidable exposure. In that sense, the study represents a significant Environment-under-Sci-Tech story: modern environmental science is being used to trace invisible chemical exposure, identify how human activities interact with ecosystems and households, and provide evidence that can support safer practices in South Africa’s agricultural communities.
