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Microplastic occurrence and removal in unbranded refilled drinking water treatment systems: Implications for human exposure in Karawang, Indonesia

Journal of Ecological Engineering 2026
Gina Lova Sari, Nadia Amanah, Zulfa Amala, Setyo Budi Kurniawan, Rizka Novembrianto, Mhd. Fauzi, Andini Siti Rohmana, Nur Ridha Amethysia, Putri Sekti Cahyaningrum, Adinda Melianda Nainggolan

Summary

Researchers tested refillable drinking water sold at local shops in Indonesia and found that even after treatment, the water still contained tiny plastic particles—mostly tiny fibers and fragments, likely from common plastics like polyethylene or polypropylene. While treatment cut microplastic levels roughly in half, it didn't remove them completely, meaning people who rely on this common, affordable water source may be regularly swallowing plastic particles without realizing it. The study is a first step in flagging this exposure risk, but more research is needed to understand the actual health effects and improve filtration methods.

Models
Study Type Environmental

It is undeniable that microplastics are found in many types of water, including drinking water.This study aims to investigate the presence of microplastics in one of the drinking water sources widely used by communities in Indonesia, namely unbranded refilled drinking water.The investigation was conducted at eight unbranded refilled drinking water depots in Karawang, West Java.A total of 2.00 L of raw and treated water samples were collected from each depot, prepared following the National Oceanic and Atmospheric Administration method, analyzed using an Olympus BX-41 microscope at tenfold magnification, and manually counted.The results showed that both raw and treated water from all unbranded refilled drinking water depots contained microplastics, with concentrations ranging from 15.50-42.00particles/L and 6.50-17.50particles/L, respectively.The dominant microplastics identified were fibers and fragments, with sizes ranging from 1.00-3.00mm and less than 1.00 mm.Furthermore, the dominant color of the microplastics was black, indicating that the polymers were likely polyethylene, polypropylene, or polystyrene.This study provides novel evidence on microplastic contamination in unbranded refilled drinking water in Indonesia, offering baseline data for future environmental monitoring and risk assessment.These findings confirm that refilled drinking water consumed by communities in Indonesia may represent a potential pathway for the entry and accumulation of microplastics in the human body, posing significant health risks.Based on current findings, further research is required to improve water treatment performance and enhance public health protection.

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