Wide area voltage quality assessment represents one of the mandatory objectives for distribution system operators in development of advanced distribution management systems supporting smart grid requirements. This paper introduces a zonal approach for wide area temporary voltage quality evaluation in distribution network. The concept of temporary voltage quality evaluation and assessment is recommended to incentivize active/online management of voltage quality issues. Decision support system based on the simple deterministic rules is proposed for rating the voltage quality zones in distribution network and making recommendations to distribution system operator. Voltage RMS level, unbalance, and total harmonic distortion are considered as voltage quality indices representing the inputs in decision support system. Residential, commercial, and industrial load types are considered in setting the thresholds for voltage quality indices. The proposed zonal approach for division of distribution network in voltage quality zones is applied to the example of a typical European-type distribution network. The operation of decision support system is tested using the developed distribution smart grid model. The following simulation case studies are conducted: loads with low power factors, manual voltage regulation at MV/LV transformers, unbalanced loads, integration of solar power plant, and nonlinear loads. The obtained simulation results reveal the benefits of the proposed voltage quality assessment approach.