Abstract
Socio-institutional factors are poorly addressed in the risk assessment of groundwater contamination. This paper contributes to the development of a socio-institutional assessment framework based on a case study of contamination by on-site sanitation (OSS) in an informal settlement of Bwaise (Kampala, Uganda). We conducted a snapshot survey of the recent extent of groundwater contamination by OSS using microbial and hydro-chemical indicators. Through transition arenas and key informant interviews, we investigated the socio-institutional drivers of the contamination. Overall, 14 out of the 17 sampled groundwater sources tested positive for Escherichia coli during the wet season. Nitrate concentrations at four sources exceeded the World Health Organization guideline value (50 mg/L), attributed to OSS. Despite the high contamination, the community highly valued groundwater as an alternative to the intermittent municipal water supply. We deduced six drivers of groundwater contamination, including land-use management, user attributes, governance, infrastructure management, groundwater valuation, and the operating environment (“LUGIVE”). Qualitative indicators for each of the drivers were also construed, and their interlinkages presented in a causal loop diagram, representing a socio-institutional assessment framework. The framework can help policymakers and the community to analyze various socio-institutional control levers to reduce the risk of groundwater contamination by OSS in informal settlements.
Highlights
The recent extent of groundwater contamination in Bwaise was assessed through water quality analysis for E. coli, NO3 −, Cl−, SO4 2− and NH3, which are usually associated with anthropogenic groundwater contamination from wastewater sources
This study contributed to the development of a socio-institutional assessment framework for groundwater contamination hazards in informal settlements through a sociotechnical approach
We demonstrated the recent extent of groundwater contamination by on-site sanitation (OSS) in a Bwaise informal settlement through a snapshot survey of microbial and hydrochemical indicator parameters and explored the socio-institutional drivers of the contamination
Summary
Groundwater is essential for sustaining ecosystem services. 1.7 billion people depend upon groundwater resources threatened by increasing contamination and depletion [1]. Groundwater contamination hazards include microbial, chemical, and, more recently, micropollutants of emerging concern [2,3,4]. Microbial pathogen contamination, including bacteria, viruses, protozoa, and helminths, have been most prevalently reported, especially in the developing world where inadequate sanitary practices prevail [3,5]. The increasing risk of groundwater contamination is a significant hindrance to meeting the sustainable development goal (SDG) number 6, to ensure availability and sustainable management of water and sanitation for all [6]
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