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 Geopolymer has emerged as an innovative and eco-friendly alternative to traditional soil improvement products such as ordinary Portland cement (OPC) and lime. Geopolymer precursors that are high in silica (Si) and alumina (Al) minerals. The use of boiler ash in this study have a high potential for geopolymerization in soil stabilisation applications. This study investigates a green technology geopolymer as an additive for enhancing the properties of landfill soil liner. Soil liners are used to contain waste in modern landfills. Geopolymer can be considered the key factor that could enhance laterite's properties in terms of hydraulic conductivity. Boiler ash is another industrial waste product from the combustion of coal. Laterite soil was mixed with different percentages of boiler ash-based geopolymer to improve the properties of the soil liner application. This research aims to determine the optimum percentage of geopolymer mixed with laterite soil as an additive and reduce the value of hydraulic conductivity. Based on the results, the increases in geopolymer content are associated with a decrease in hydraulic conductivity, leading to a significant reduction in hydraulic conductivity. A Nomograph model was successfully developed from this study. The nomograph for predicting hydraulic conductivity, k, was developed as alternative guidelines for engineers to design landfill soil liners without conducting laboratory testing, which takes a long time and can reduce cost and time.