Previous research has demonstrated the robust nature of DOWFAX surfactants for enhanced subsurface remediation. However, these surfactants are not as effective as others in enhancing contaminant solubility. A series of experiments evaluated various methods of increasing the solubitity enhancement of the DOWFAX components (i.e., using a cosurfactant, adding an electrolyte, and forming middle-phase microemulsions). Results demonstrate that while increasing the alkyl chain produced slight increases in contaminant solubility, middle-phase microemulsions produced the greatest enhancements. Middle-phase microcmulsions were produced using an electrolyte, isobutanol, a cosurfactant, and one of the DOWFAX components. Middle-phase microemulsions increased contaminant solubilities by one to two orders of magnitude over DOWFAX surfactants alone, and by three to four orders of magnitude relative to water. Thus, DOWFAX-based microemulsion systems have the potential to significantly enhance contaminant solubility and expedite environmental remediation.