Legionella and Escherichia coli (E. coli), bacteria lethal to humans, are widespread in drinking water. Traditional disinfection methods using chlorine gas, temperature control, and ultraviolet are widely applied today but have several drawbacks. In contrast, the electrochemical disinfection methods could address the problems. This study reviews the literature on electrochemical disinfection and compares traditional disinfection methods with electrochemical ones under evaluation of cost, E. coli contamination efficiency, and effect. Results show that titanium meshed electrodes are the most cost-efficient compared to more effective electrodes with significantly higher production costs. The application of the proposed electrochemical disinfection device gains a financial advantage over traditional methods, suggesting a promising future for the disinfection method. Meanwhile, investigations on the electrocoagulation method aim to disinfect the water to the drinking water level. Results show that the combination of electrocoagulation and the titanium meshed electrode device proves to have a better disinfection effect than individual methods and a lower cost than traditional methods. This research provides insight into the properties of biofilms, traditional disinfection methods, and different electrochemical disinfection methods. After reviewing the literature and evaluating various factors, we offer an ideal design for Legionella and E. coli-contaminated water disinfection devices with a promising future once applied.