Per- and polyfluoroalkyl substances (PFAS), often called "forever chemicals," are widespread pollutants that do not break down easily and have been linked to health concerns. These chemicals, commonly found in industrial waste, firefighting foams, and consumer products, have contaminated water sources across the United States, including New Jersey, where high levels have been detected. Exposure to PFAS has been associated with health risks, making reliable detection critical. However, current testing methods, such as liquid chromatography-mass spectrometry (LC-MS), are expensive, time-consuming, and require highly specialized laboratory facilities. This makes it challenging to monitor PFAS contamination in real time, especially in rural or underserved communities that may not have access to advanced lab testing. This project aims to develop a portable, low-cost sensor system that detects PFAS in water on-site and in real time. The sensor integrates a specially designed fluorous electrochromic polyaniline material with an extended gate field-effect transistor, allowing it to provide both electrical and optical dual-mode detection. This approach ensures high accuracy and reliability, even for very low contamination levels. Beyond scientific innovation, this project will have a broader impact on education and community engagement. The findings will be incorporated into the PI’s physics courses to help students connect theory with real-world applications. The project will contrib