A 17-year-old learner from Mbombela is about to carry South Africa’s flag onto one of the world’s most respected science stages. The Department of Water and Sanitation has called on South Africans to rally behind Sinenhlanhla Sikhulile Nkosi as he prepares to represent the country at the prestigious Stockholm Junior Water Prize in Sweden later this month.
Sinenhlanhla, a Grade 11 learner at Sitintile Secondary School in Mbombela, Mpumalanga, made history as the first learner from his province to win the department’s flagship 2026 South African Youth Water Prize, the annual competition that challenges learners in Grades 9 to 11 to develop innovative, science-based solutions to real water problems in their schools and communities.
The Sentinel Barrier: a clever fix for an invisible problem
Sinenhlanhla secured the national title with a project called The Sentinel Barrier — an innovative silicone-based elastomeric coating applied to the inside of PET plastic bottles. The invention helps prevent microplastics and harmful chemicals from leaching into drinking water, offering a practical answer to one of the world’s fastest-growing environmental and public health concerns.
In Stockholm he will compete alongside some of the world’s most promising young scientists, with entrants from more than 30 countries sharing their passion for water and environmental innovation. The Stockholm Junior Water Prize is widely regarded as the world’s leading water-focused competition for school-age researchers, and simply reaching it places a learner among the very best young scientific minds of their generation.
His route there was anything but easy. The South African Youth Water Prize is the Department of Water and Sanitation’s flagship schools programme, drawing entries from across the country each year, and Sinenhlanhla had to beat the best of every other province to claim the 2026 national title — something no Mpumalanga learner had ever done before.
How South Africans can help
Beyond the main competition, Sinenhlanhla also has a shot at the Stockholm Junior Water Prize People’s Choice Award, which is decided by online public vote.
“Every vote is a vote of confidence in a young South African whose innovation and determination have taken him from a classroom in Mpumalanga to one of the world’s most respected science platforms,” the Department of Water and Sanitation said.
Voting is simple and open until 15 August 2026:
- Visit the Stockholm Junior Water Prize People’s Choice Award page.
- Select Sinenhlanhla Sikhulile Nkosi’s project, “Barrier coatings for reducing microplastic release and chemical leaching in plastic containers”.
- Submit your vote.
The South African Youth Water Prize has over the years nurtured some of the country’s brightest young minds, providing a launch pad for future scientists, engineers and environmental leaders. Win or lose in Sweden, Sinenhlanhla has already shown what South African classrooms can produce — and for the next week, every South African with an internet connection can stand behind him.
Facts and quotes sourced from SAnews.gov.za, the South African government news agency.
Photo: commons.wikimedia.org
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