The paper recent by indices of water quality and effects of eutrophication, Water is one of the most widely distributed substances across the world’s surface and is crucial for a variety of aspects of human health, development and well-being as well as for the functioning of natural ecosystems. Eutrophication is an environmental process enrichment of waters by inorganic nutrients, especially these nutrients are nitrogen and phosphors and results from primary productions. On the other hand, Pollution by eutrophication due to the problems in lakes, rivers and marine habitat. Water quality is important for our health and well-being, can be used for diffident purposes.

The study was conducted in Erbil city north of Iraq. Everywhere in the world, the drinking water utilities face the challenge of providing water of good quality to their consumers as significant water quality changes can occur within drinking water distribution systems due to contamination. From this study, we have collected water samples from twenty well drinking water in some quarters from Erbil City with three replicas. Our results showed that the maximum value of free chlorine recorded in Badawa and Galawesh quarters which were greater than 0.5 mg/l, while, the values of free chlorine of most quarters were less than 0.2 mg/l, which were not within the recommended safe residual chlorine level of 0.2-0.5mg/l.

The study was conducted for assessing the effect of storage temperature and sun light exposure on four bottled water (A, B, C, D company) marketed in Kirkuk city, north Iraq during February 2017 to May 2017. Physicochemical tests were including (EC, TDS, pH, turbidity, alkalinity, total hardness, Ca+2, Mg+2, Na+ and K+). The pH values (7.40-7.89) show slightly alkaline trend. The electrical conductivity of bottled water sample showed with short variation (209-468 µS/cm) and all samples are with the WHO and IBWA limit for drink water. Total dissolved solid (TDS) values of sample varied between (118–288 mg/L). Turbidity values for all samples from study area fluctuated between (0.06–4.99 NTU) all samples are with the WHO limit for drink water. Total alkalinity values for all samples from study area ranged between (88–205 mg CaCO3/L). Calcium and magnesium concentration in bottled water varied from 23.34–49.98 mg/L and 3.86-22.32 mg/L respectively. Sodium ion concentration ranged between 0.1-5.05 mg/L. In the present study the potassium ion concentration ranged between 0.1-1.08 mg/L. The change of physicochemical characteristic investigated when the bottled water exposed to sunlight or storage at different temperature according to WHO and IBWA.

The study was conducted in Erbil city north of Iraq. Everywhere in the world, the drinking water utilities face the challenge of providing water of good quality to their consumers as significant water quality changes can occur within drinking water distribution systems due to contamination. From this study, we have collected water samples from twenty well drinking waters in some quarters from Erbil City with three replicas. Our results showed that the maximum value of free chlorine recorded in (Badawa and Galawesh) quarters which were greater than 0.5, while, the values of free chlorine of most quarters were less than 0.2, which were not within the recommended safe residual chlorine level of 0.2-0.5mg/l.

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