The usage of plastic has been increasing from year to year for its durable, lightweight, sturdy, easy to form, and low cost production, so that plastic becomes a popular material. Plastics have affinities with persistent organic pollutant such as PCB, DDT, PAH and phthalates that can damage the ecosystem as well as harm to human. In this study plastic wastes were collected using nets in seven stations along Baturusa watershed, sorted based on its composing resin (RIC), then measured the abundance and the density rate on each station. 36% of the collected plastic wastes are Polypropylene (02), and 24% are LDPE (04). The highest density rate of collected plastic wastes was found on Mabet river (1.36 x 102 items/m3), followed by Baturusa river, and Rangkui river estuary. These three stations are located near the settlements so that the source of the plastic wastes comes from domestic activities. The variety of waste management showed a significant impact to the amount of plastic wastes on waters. One of the plastic waste management for the settlements is to carry out 3R (reduce, reuse, recycle), such as waste bank programs and implement EPR (extended producer responsibility) programme. The successfulness of this programme can only be achieved by the active participation of the waste bank customers and the implementation of 3R principle in daily life.

Acrylamide is a chemical commonly used for water treatment 45%, oil drilling 20%, pulp and paper 20%, mining 10%, and other 5%. Acrylamide is naturally formed from starchy foods/carbohydrates heated at a temperature of 120 C. Acrylamide contamination can be through surface water or ground air, through air channels that flow into wells, rivers, to the sea. Several studies have reported an increased risk of kidney disorders, endometrial cancer, and ovarian cancerdue to exposure to acrylamide. Acrylamide can cause ovarian cancer through its effects on sex hormones. Research shows that glycidamide mutations are found in one-third of the approximately 1,600 tumor genomes corresponding to 19 human tumor types from 14 organs. There is an unexpected extensive contribution of acrylamide-associated mutagenesis in human cancer. Enriched presence of glycidamide was observed in lung cancers (88%), liver tumors (73%), kidney (above 70%), bile ducts (57%), cervical (50%), and to a lesser extent, breast cancer. additional cancer.

Microplastics has been found in the most water bodies since 1970s, yet its presence and understanding about the existence on the freshwater body, as well as a control upon its abundance is still very limited. Whereas the river became a very potential channel for microplastics in contaminating the environment. Microplastics is term refer to plastic particles which diameter less than 5 mm. Microplastics could act as an absorbent of chemicals from the environment, and also a carrier of additive chemicals added during the process of plastic manufacturing to the organisms. It can potentially affect the organisms through the aquatic food web. This study aims to figure out the abundance and distribution of microplastics in Baturusa watershed. The research was carried out from November 2019 to August 2020. Samples were collected using plankton net of 30μm mesh size, from seven sites represent upstream, downstream, and tributaries, then analyzed using an ocular microscope. The microplastics particles type found are sheets, films, fibers, and fragments. The average microplastics abundance was 2209–5569 particles m−3, the highest abundance was found in Rangkui River estuary about 5647 particles m−3, and the lowest was in Selindung River. This reveals that the more abundance of microplastics in the waters was correlated to the more human activities surroundings.