This research work aimed to investigate the degree of quality of tap and bottled waters available in Al-Madinah city through an experimental program comprising chemical, physical and biological tests. The study included examining the quality of the water supply network components such as taps, underground storage tanks and feeding pipes of the network. Filtration influence on the tap water was investigated by testing different water samples before and after the filtration process at different locations. The experiments also examined various bottled water brands sold in Al-Madinah. In addition, the impact of using the dispenser on the water quality of large bottled waters was studied. The water quality of two types of waters was compared by estimating water quality index (WQI). Results of this study revealed that the overall quality of the tap water is within standard values; however, deterioration occurs for the water through its journey in the water supply system. Results revealed that hardness and fluoride concentrations in bottled waters exhibited high values close to or more than allowable values of the standards. Furthermore, results confirmed that using the filter and dispenser decreased the water quality degree in the long run. Bottled waters showed a higher grade of WQI than tap water.

这项研究工作旨在通过一项包括化学，物理和生物测试的实验计划，对马迪纳市的自来水和瓶装水的质量进行调查。该研究包括检查供水网络组件的质量，例如水龙头，地下储水罐和供水管网。过滤对自来水的影响通过在不同位置进行过滤之前和之后测试不同的水样来进行研究。实验还检查了在Al-Madinah销售的各种瓶装水品牌。此外，还研究了使用分配器对大瓶装水的水质的影响。通过估算水质指数（WQI），比较了两种水的水质。这项研究的结果表明，自来水的总体质量在标准值之内。但是，水在供水系统中的行程会发生变质。结果显示，瓶装水中的硬度和氟化物浓度显示出接近或超过标准允许值的高值。此外，结果证实，使用过滤器和分配器从长远来看会降低水质程度。瓶装水的WQI等级比自来水高。结果证实，从长远来看，使用过滤器和分配器会降低水质程度。瓶装水的WQI等级比自来水高。结果证实，从长远来看，使用过滤器和分配器会降低水质程度。瓶装水的WQI等级比自来水高。