The clean water crisis in Indonesia's coastal regions has become worse because of seawater intrusion and excessive groundwater usage which needs affordable sustainable water treatment solutions. The research will test how well a basic solar-powered distillation unit creates fresh water from saltwater while studying two distinct operational methods which include System A by solar heating alone and System B that adds an electric heater to the system. The glass distillation unit operated through two separate modes which allowed seawater samples to be processed by both systems. The testing of distillation outcomes together with wastewater analysis followed standard water quality testing procedures through physical and chemical and microbiological assessments which included salinity measurement and total dissolved solids (TDS) evaluation and pH level detection and Cr⁶⁺ content analysis and nitrate measurement and total coliform and fecal coliform testing. The study results demonstrate that both systems achieve 99.94-100% salinity reduction and 99.93-99.95% TDS removal while achieving over 99% efficiency in Cr⁶⁺ and nitrate elimination. Microbiological testing results showed all coliforms and fecal coliforms were completely eliminated during the process. The distillate product created a solution with pH levels that fell below the drinking water standards which needed extra processing. Solar distillation produces safe water according to the research but adding an electric heater stabilizes the process without water quality changes. The system operates under two main restrictions because it depends on weather patterns and requires distillate remineralization before people can drink it. The dual-mode system provides an effective solution which coastal communities can apply to address their water needs. The research makes a unique contribution through its combined system design and complete assessment of both distillate and process wastewater quality which demonstrates solar distillation effectiveness as a sustainable water supply.