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One of the prerequisites for maintaining the health of the community is the use of safe drinking water (1). So, water is very important for human activity (2). In recent decades, industrialization, mechanization of agricultural activities and population growth, etc., is among the factors that pollute drinking water (3). Various diseases such as diarrhea, cholera, dysentery, typhoid, etc. can create by polluted drinking water (4). Overall, contaminated water due to the degradation of water quality and can threaten the human health and disturb the balance of the ecosystem (2,5). Water suppliers are responsible for providing safe water to the community use. Various tools are available to ensure the safety of water supply systems, including the hazard analysis critical control (HACCP), qualitative microbial risk assessment A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Sep 13, 2018 Received in revised form: Feb 24, 2019 Accepted: Feb 28, 2019 Available Online: Marc 14, 2019 Background & Aims of the Study: There are several methods for determining the water supply system safety, including the WSP program that recommended by the World Health Organization (WHO). So, the aim of this study was assessment the water supply system of Hamadan city based on the Water Safety Plan (WSP) guideline introduced by the world health organization in 2018. Materials & Methods: This investigation employed the WSP-QA Tool and the WSP manual of the WHO and the AWI in 2017. For this purpose, software checklists were prepared and, after confirmation of content and face validity, completed based on Hamadan water and wastewater company records and interview with company’s experts. Data was analyzed using WSP-QA Tool and then system hazards were identified and risk assessment and prioritized hazards were performed by use of semi-quantitative risk matrix approach presented by the WHO guideline. Results: The results showed that from the total score of 440 complete implementations of WSP and according to the 384 score related investigation different phases of this study, the 220 score was achieved that 50 % was coordinated with WSP. The Results of risk assessment showed that discharge wastewater from a village and agriculture in the catchment, blocked filter and algae in treatment, old pipe and excavation and installation facilities in the distribution and pressure drop and constructing wells at home in point of use are the most important hazards in water supply system of Hamadan. Conclusions: Overall, The results showed that the implementation WSP in Hamadan city is in a moderate situation.

Risk Assessment of Water Supply System Safety Based on Water Safety Plan (WSP) Implementation in Hamadan, Iran