The ground water quality of Okobo Local Government Area was investigated. Sixteen boreholes (BHs) water samples were collected from four zones (Okopedi, Ekeya, Ukwong and Okiuso) in Okobo. Standard analytical procedures were used to analyze the physicochemical, bacteriological and heavy metal parameters in the water samples and the results compared to Nigerian standard for drinking water quality (NSDWQ). some physicochemical parameters investigated were within the acceptable limits set by NSDWQ except pH (5.99 ± 0.37), DO (0.31 ± 0.06) mg/L, BOD5 (6.26 ± 0.4) mg/L and Nitrate (62.53 ± 5.96) mg/L. Bacteriological parameter like fecal coliform (128.69 ± 31.40) MPN/100 mL and total coliform (287.63 ± 40.31) MPN/100 mL were also above the limits set by NSDWQ implying organic pollution due to fecal contamination. Heavy metals were also within the acceptable limit except Lead (0.1 ± 0.1) mg/L, Chromium (0.4 ± 0.2) mg/L, and Manganese (0.16 ± 0.2) mg/L which were slightly above acceptable limits in all the zones. Water quality index calculation results grouped the BHs into; BH7 (26–50) very good; BH1, BH3, BH4, BH8, BH11, BH14, and BH16 (51–75) poor; BH2, BH5, BH6, BH9, BH12, BH13 and BH15 (76–100) very poor and BH 10(> 100) unsuitable for drinking. Pearson coefficient correlation, principal component analysis (PCA) and cluster analysis (CA) were used to establish interrelationship among the parameters, common sources of the pollutants and grouping of the BHs affected by these pollutants. PCA extracted six principal components (PCs) from the investigated parameters in the BHs, with sources of pollution either natural mineral or anthropogenic source. CA grouped all the sixteen BHs investigated into three clusters with various levels of contamination from pollutant sources. Consequently, the polluted BHs require treatment using high test hypochlorite (HTH) as the pollutant common to all the BHs is mostly bacterial pollutant; moreover, BHs should be sited 15 m away from septic tank or latrine to reduce contamination from coliform.

对奥科博地方政府辖区的地下水水质进行了调查。从 Okobo 的四个区域（Okopedi、Ekeya、Ukwong 和 Okiuso）收集了 16 个钻孔 (BH) 水样。使用标准分析程序分析水样中的物理化学、细菌学和重金属参数，并将结果与​​尼日利亚饮用水质量标准 (NSDWQ) 进行比较。除了 pH (5.99 ± 0.37)、DO (0.31 ± 0.06) mg/L、BOD5 (6.26 ± 0.4) mg/L 和硝酸盐 (62.53 ± 5.96) mg/L 外，一些被调查的物理化学参数在 NSDWQ 规定的可接受范围内。粪便大肠菌群 (128.69 ± 31.40) MPN/100 mL 和总大肠菌群 (287.63 ± 40.31) MPN/100 mL 等细菌学参数也高于 NSDWQ 设定的限值，表明粪便污染导致有机污染。除了铅 (0.1 ± 0.1) 毫克/升、铬 (0.4 ± 0.2) 毫克/升和锰 (0.16 ± 0.2) 毫克/升在所有区域都略高于可接受的范围外，重金属也在可接受的范围内。水质指标计算结果将 BHs 分组为；BH7 (26–50) 非常好；BH1、BH3、BH4、BH8、BH11、BH14 和 BH16 (51-75) 差；BH2、BH5、BH6、BH9、BH12、BH13 和 BH15 (76–100) 非常差，BH 10(> 100) 不适合饮用。Pearson 系数相关、主成分分析 (PCA) 和聚类分析 (CA) 用于建立参数之间的相互关系、污染物的共同来源和受这些污染物影响的 BH 的分组。PCA 从 BH 的调查参数中提取了六个主成分 (PC)，污染源为天然矿物或人为源。CA 将所有被调查的 16 个 BH 分为三个集群，具有不同程度的污染源污染。因此，受污染的 BHs 需要使用高次氯酸盐 (HTH) 进行处理，因为所有 BHs 共有的污染物主要是细菌污染物；此外，BHs 应位于距化粪池或厕所 15 m 处，以减少大肠菌群的污染。