Continuous vigilance of water quality is essential throughout water supply and storage systems to ensure safe water quality and safeguard consumer health. In the present study, sixty-three sampling locations in Sharjah, UAE, were assessed for possible water quality variations from water supply through utilized water storage tanks in buildings. All investigated physico-chemical parameters were within national water quality guidelines except for free residual chlorine (< 0.2 mg/L in 30% of samples), mainly in storage tanks. Compliance of metal concentrations varied with metal type, sampling locations, and points. Highest compliance was reported for manganese, copper, nickel, chromium, and least for iron, lead, and cadmium. No major variations in physico-chemical water quality could be statistically observed using analysis of variance when tracing the water from lower tanks to upper tanks, yet significant variations for turbidity (p = 0.006) were observed from mains to lower tanks and for water temperature (p = 0.026), residual chlorine (p = 0.001), turbidity (p = 0.048), chromium (p = 0.019), copper (p = 0.002), manganese (p = 0.012), and zinc and lead (p = 0.000) from mains to upper tanks. As for investigated microbiological parameters, all investigated samples were completely free from total and fecal coliforms and Pseudomonas aeruginosa. Exhibited ranges of yeasts and molds (0–28 CFU/100 mL) and heterotrophic plate counts (0–356 CFU/mL), though non-enforceable parameters, were always lower than recommended water quality guidelines. Furthermore, Pearson correlation tests exhibited significant correlations for water temperature versus yeasts and molds and electrical conductivity versus sodium and potassium. Statistically (using t-tests), mean heterotrophic plate counts were slightly higher in lower tanks compared to other sampling points. Additionally, mean heterotrophic plate counts were significantly higher in larger tanks exceeding 2000 gallons, in square/rectangular shaped tanks, in tanks exceeding 10 years of age, and in concrete tanks with higher water temperatures. Re-chlorination, proper cleaning, as well as maintenance or upgrade of water storage tanks remain advisable to ensure safe water at point of use.

在整个供水和储存系统中，对水质的持续警惕对于确保安全的水质和保护消费者健康至关重要。在本研究中，对阿联酋沙迦的 63 个采样点进行了评估，以评估通过建筑物中利用的储水罐供水可能造成的水质变化。除了主要在储罐中的游离余氯（30% 的样品中< 0.2 mg/L）外，所有调查的理化参数均在国家水质准则范围内。金属浓度的合规性因金属类型、采样位置和点而异。锰、铜、镍、铬的合规性最高，铁、铅和镉的合规性最低。p  = 0.006) 从总管到下水箱和水温 ( p  = 0.026)、余氯 ( p  = 0.001)、浊度 ( p  = 0.048)、铬 ( p  = 0.019)、铜 ( p  = 0.002)、锰 ( p  = 0.012) 和锌和铅 ( p  = 0.000) 从主管到上水箱。至于被调查的微生物参数，所有被调查的样品都完全没有总大肠菌群和粪便大肠菌群和铜绿假单胞菌. 酵母菌和霉菌 (0–28 CFU/100 mL) 和异养菌板计数 (0–356 CFU/mL) 的展示范围，虽然无法执行参数，但始终低于推荐的水质指南。此外，Pearson 相关性测试显示出水温与酵母菌和霉菌以及电导率与钠和钾的显着相关性。统计上（使用t-tests），与其他采样点相比，较低水箱中的平均异养平板计数略高。此外，在超过 2000 加仑的大型水箱、方形/矩形水箱、使用年限超过 10 年的水箱以及水温较高的混凝土水箱中，平均异养菌板计数显着更高。重新氯化、适当清洁以及维护或升级储水箱仍然是可取的，以确保使用点的安全用水。