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Microplastics contamination in Isinuka springs and CO2-seeping freshwater systems in South Africa: a baseline study
Summary
Scientists testing sacred healing springs in South Africa found tiny plastic particles (mostly plastic fibers) in every single water sample, even though these springs are considered pure and untouched. This matters because many people drink this water, bathe in it, and use it for spiritual healing practices, meaning they may be unknowingly ingesting or absorbing microplastics regularly, highlighting that even remote, culturally protected water sources aren't safe from plastic pollution.
Microplastic (MP) pollution is increasingly being reported in freshwater ecosystems, yet culturally significant and geochemically unique systems remain poorly studied. This study provides baseline evidence of MP contamination in South Africa’s sacred freshwater systems, specifically Isinuka springs and CO2-seeping freshwater systems along the Bongwana Fault. Surface water samples were collected from nine sites, including Isinuka springs (four sites; n = 4) and CO2-seeping freshwater systems (five sites; n = 5). Microplastics were found at all sites, with abundances ranging from 5 to 48 particles I−1 (average ≈ 20.4 particles I−1). Transparent MP particles were the most common colour (38.6%), fibres/filaments were the dominant shape (69.6%), particles ≥ 20 µm accounted for the highest proportion by size (51.1%), and polypropylene (PP) was the most frequently identified polymer (38%). A variety of MP patterns were observed, with the highest number of MP particles found at the most intensively used sacred site (Isinuka spring; Site 1). These findings highlight that sacred freshwater systems, often regarded as pristine due to their cultural and traditional significance, are vulnerable to MP contamination, with potential ecological, cultural and public health implications for communities that rely on these waters for drinking, healing and spiritual practices. This study provides essential baseline data and underscores the need for wider MP monitoring in South African sacred freshwater systems, including sediments and biota, while also emphasising the importance of combining scientific approaches with cultural management and community awareness to protect these sacred waters from MP pollution.