Comparative assessment of groundwater quality and stability around active and closed dumpsites in Ibadan, Nigeria.

The research intended to appraise the worth, corrosion, and scale formation of well water samples collected near active and shut dumpsites. Groundwater samples were analyzed for physicochemical parameters using standard analytical procedures. All samples near the active dumpsite (DS) were potable, meeting the World Health Organization standards for drinking water. In contrast, samples near the abandoned DS did not meet the acceptable limits. The water quality index values classified 90% of water samples near the active DS as "Excellent to good quality". Near the closed DS, 90% of water samples were deemed "poor to unsuitable" for drinking, with only 10% meeting good quality standards. Most irrigation parameters indices (IPI) indicated that aquifer units near the abandoned DS were suitable for irrigation, while only a few IPIs suggested suitability for GW near the active DS. Stability tests revealed corrosive tendencies in groundwater near the active DS, while scale-forming tendencies were observed near the abandoned DS. The study recommends regular assessment of groundwater quality and water treatment for shallow dug wells near the studied residential areas, with the use of corrosion inhibitors. Similar evaluations should be conducted in other locations near operational and closed waste disposal sites under different geological formations to ensure sustainable management of groundwater resources.