Ogbaru Communities are usually submerged by intense flood during the rainy season, but such flood recedes during the dry season. This natural occurrence makes the quality of the borehole water in the area questionable. The total bacterial, total coliform, faecal coliform and Vibrio cholerae counts of samples from fifteen boreholes in the communities were determined during both seasons using standard analytical methods. The values were 100-270 cfu/100ml;10-42cfu/100ml;0-28 cfu/100ml and 0-13cfu/100ml for total bacterial, total coliform, faecal coliform and Vibrio cholerae counts respectively during the dry season and 130-450 cfu/100ml; 25-86 cfu/100ml; 0-75 cfu/100ml and 0-18 cfu/100ml for the total bacterial, total coliform, faecal coliform and Vibrio cholerae counts respectively during the rainy season. Salmonella typhi (53.3%), Enterobacter aerogenes (53.3%), Pseudomonas aeruginosa (46.7%), Proteus vulgaris (46.7%), klebsiella variicola (26.7%), Escherichia coli (26.7%), Staphylococcus aureus (13.3%) and Vibrio cholerae (33.3%) were isolated during the dry season while S. typhi (60.0%), E. aerogenes (60.0%), P. aeruginosa (53.3%), P. vulgaris (46.7%). K. variicola (33.3%), E. coli (26.7%), S. aureus (13.3%), V. cholerae (46.7%) and Providencia sneebia (6.7%) were recovered during the rainy season. S. typhi occurred most frequently during both seasons. Total bacterial, total coliform and Vibrio cholerae counts were significant at 5% significance level using t-distribution. The boreholes analysed were polluted by bacteria and need adequate treatment such as sand filtration, chlorination and boiling before drinking to avert a public health hazard.

Analysis of water boreholes in Ogbaru Communities, Anambra State was carried out during the dry and wet seasons to determine the effect of seasonal variation on their physicochemical characteristics. Fifteen drinking water boreholes were sampled from different locations in the communities. The pH values were in the range of 3.4-8.

Ogbaru communities in Anambra State, Nigeria experience heavy flooding during the wet season thereby exposing the boreholes sited there to the risk of contamination by microorganisms. Water samples from fifteen drinking water boreholes in the area were analysed for the presence of fungi during the dry and wet seasons using standard analytical methods. The fungal counts were 3-25/cfu/ml and 4-30cfu/ml during the dry and wet seasons respectively. The fungi isolated during both seasons were Penicillium chrysogenum, Aspergillus versicolor, Cladophialophora carrioni, Aspergillus terreus, Candida albicans and Rhodotorula glutinis. C. albicans and A. terreus, each were isolated from 20.0%, R. glutinis and C. carrioni each in 13.3%, P. chrysogenum in 33.3% and A. versicolor in 26.7% of the boreholes studied during the dry season while C. albicans, R. glutinis and A. terreus each were detected in 26.7%, P. chrysogenum in 40.0%, A. versicolor in 33.3% and C. carrioni in 20.0% of the boreholes investigated during the wet season. Aspergillus terreus occurred most frequently (31.4%) in the borehole water samples during the dry season while Penicillium chrysogenum had the highest frequency of occurrence of 28.3% during the wet season. All the borehole water samples analysed were contaminated by fungi and must undergo adequate treatment such as sand filtration chlorination, aeration and boiling before use.