Concrete is essential for modern construction. It consists of cement, water, aggregates, and additives, mixed to achieve specific properties. Fine aggregate enhances the volume and workability of the mixture. The rising demand for river sand for construction raises environmental concerns. The incorporation of waste plastic as a partial fine aggregate alternative has garnered significant interest due to environmental and economic benefits. Utilizing waste plastic could promote sustainability and mitigate environmental effects. An empirical study evaluated the impact of integrating Waste Plastic Powder (WPP) in concrete, aiming to mitigate river sand extraction and address waste management issues. The research involved the casting of 108 specimens across various concrete types, revealing that while WPP enhances certain mechanical properties like flexural strength and split tensile strength at a 10% replacement level, it concurrently reduces overall compressive strength with increased substitution.