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Harmonics are associated with nonlinear loads which draw non-sinusoidal currents even from a sinusoidal voltage source. Harmonics are produced when nonlinear loads are connected to distribution system. Modern harmonic sources consist of power electronics-based home appliances such as computer power supplies, electronic lighting ballasts, and uninterruptible power supplies. Harmonics cause many problems in electrical installations such as overheating, derating, efficiency reduction and reduced functionality. Passive harmonic filters is one of the mitigation scheme for harmonics in power systems. This paper presents a study and design of a single tuned passive harmonics filters to minimize harmonic distortion caused by a harmonic sources. The system has been implemented using ETAP software. The simulation results show that combination of single-tuned filters is an appropriate approach to mitigate the 3rd, 5th, and 7th characteristic harmonics in distribution systems.