Fly ash primarily consists of finely divided unburned oxides generated during the combustion of coal. Fly ash is comprised of elements such as mercury, cadmium, and arsenic, which have the potential to contaminate waterways and the air, posing a threat to human beings, wildlife, and the ecosystem. Similarly, a multitude of plastic chemicals act as endocrine disruptors, causing hormonal imbalances, reproductive issues, and cancer. Microplastics also release bisphenol A and phthalates, which can enter the body. Both classes of chemicals disrupt the regular operation of the endocrine system. Dioxin is a toxic waste product that is produced because of the incomplete burning of polyvinyl chloride plastics. As a result, the handling and disposal of chemicals such as fly ash and plastic waste have become a great environmental concern. In this study, fly ash and shredded plastic waste were used as a partial replacement for cement and fine aggregate in the production of concrete paver blocks. To assess the influence of these materials on the performance of paving blocks, the amount of fly ash is systematically altered from 10 to 25% without the addition of plastic as the first step. In the second step, the quantity of shredded plastic varies while maintaining the proportion of fly ash at 25%. The performance of these paver blocks is determined based on their ability to absorb water and their resistance to compression. Findings indicate that increasing fly ash content enhances the compressive strength and decreases the water absorption capacity of the paver blocks. Furthermore, there exists an optimal proportion of plastic at which its performance is maximum, and further increases will reduce the compressive strength.