Water quality challenges and microbial risk in rural areas: water source, pollution pathways, microbial risk, surveillance gaps, and integrated risk management

The continued use of unimproved water sources remains a major contributing factor to microbial contamination in rural and low-resource areas experiencing inadequate sanitation and weak surveillance. Point sources and non-point sources such as pit latrines, agricultural runoff, wastewater, and open defecation are identified as important sources affecting surface and groundwater quality, affecting vulnerable groups, which include children under the age of 5 years, the elderly (65 years), and the immunocompromised. This review synthesizes the current evidence on the sources of drinking water, contamination routes, health hazards, and control measures and management with regard to waterborne pathogens, with emphasis on rural settings and resource-limited areas. It critically evaluates the limitations of existing control measures and risk management strategies, highlighting conditions such as poor infrastructure, financial burden, and technical challenges contributing to delays in pathogen detection, reliance on centralized laboratory-based techniques, data fragmentation, and the absence of real-time detection for early warning. Moreover, the implementation of Water Safety Plans and Sanitation Safety Plans, providing risk assessment and management, remains ineffective and unadoptable in low-resource settings. As a principal contribution, the review provides a conceptual framework of a decentralized and integrated microbial risk management strategy that brings together Water Safety Plans (WSPs) and Sanitation Safety Plans (SSPs) with community-based surveillance, context-dependent diagnostics, digital data integration, and better governance. By moving beyond the conventional microbial surveillance paradigm as a reactive measure to waterborne diseases, the conceptual framework presented in the review creates a pathway to better address the challenges of waterborne diseases in low-resource settings.