This new localized surface plasmon resonance optical fiber sensor represents a significant advancement in household water quality monitoring to address arsenic contamination. As arsenic contamination poses a serious environmental and public health challenge for millions worldwide, this cost-effective sensor offers rapid analysis in just 0.5 seconds. Here, #OpticaStudentMember Fatima Banoo, Indian Institute of Technology Guwahati, showcases its impressive features such as high reusability, repeatability, stability, and reliability, making it an effective tool for monitoring and ensuring safer water quality. #technology #photonics #waterqualitytesting #waterquality