Assessment of quality and health risks in drinking water sources in Aba, Nigeria

ABSTRACT Unregulated urban activities significantly impact drinking water quality in many developing communities. This study applied a Water Safety Plan (WSP) to assess water quality, health risks, and the effects of harmful environmental practices in Aba, Nigeria, where the waterworks infrastructure is dysfunctional. The datasets used were collected from physicochemical, chemical, and bacteriological analyses of drinking water samples (natural sources: n = 60, secondary sources: n = 19), along with household surveys (120) and semi-structured expert interviews (10). Findings revealed that groundwater is the primary drinking water source, with most facilities classified as improved sources. However, poor sanitation practices, particularly improper septage disposal, were identified as major contributors to water contamination. Risk assessments based on hazard quotient/index (HQ/HI < 1) indicated low health concerns overall, but higher risks were observed in areas with intense urbanization. Bacteriological analysis showed severe contamination in the Aba River, while sachet water posed significant health risks due to the presence of E. coli and total coliform bacteria in some cases. Despite existing environmental policies in Nigeria, weak institutional frameworks and ineffective local governance hinder effective water quality management. Addressing these challenges requires stronger regulatory enforcement and locally adapted strategies to ensure safe drinking water access.