Assessment of the Escherichia coli pollution in drinking water and water sources in Sistan, Iran

Abstract

Water should be free of dangerous agents and able to provide the nutritional needs of humans and animals. Adequate and reliable water supply is essential for healthy animal production. This study was carried out in Sistan region, Sistan and Baluchistan State, Iran, to evaluate the pollution rate of drinking water and water sources with fecal Escherichia coli via most probable number (MPN) method. A total number of 100 water samples were collected and divided to drinking and nonpotable water groups. The non-potable water was categorized according to flow type, irrigation usage, type of accessibility and geographic location. Mean number of MPN of fecal E. coli in nonpotable and drinkable water were detected, 6.1 × 10 2 and 2.4 coliforms per 100 mL, respectively (p < 0.05). Running water was more contaminated than still and pipe water in the study area (p < 0.05). Significantly, the MPN of fecal coliforms, in non-potable water, collected from the east was higher than the west part of the study area (p < 0.05). Among potable water, in the study area, the west part was remarkably more polluted with fecal E. coli than the east part of the study area (p < 0.05). Results indicated the applicability of water for animal consumption and an alarming signal for human consumption and public health.

The Effect of Biological and Physicochemical Factors on the Water Quality of the Al-Warar System in the City of Ramadi, Western Iraq

“…In addition, some types of bacteria in the water are non-autotrophic, meaning they decompose the organic materials present in the water and thus contribute to their role. Effective in the process of recycling factors in water [18]. The reason for the seasonal variations in the numbers of bacteria in water and the high numbers of bacteria in the summer is due to the process of decomposition of phytoplankton, which helps provide nutrients for these types of bacteria [19].…”

An example of the adverse impacts of various anthropogenic activities on aquatic bodies: Water quality assessment of the Provadiyska river (Northeastern Bulgaria)

“…The untreated or inadequately treated municipal effluents contain fecal coliforms and so import pathogenic bacteria into the waters. Such microbial organisms pose a serious threat to public health (Mills et al, 2018, Nazemi et al, 2018. Industrial wastewaters inflict no less harmful effects.…”