This application note explains how volatile organic compounds (VOCs) enter drinking water, their potential health impacts, and why they must be carefully monitored at very low levels. You will learn how Purge and Trap GC‑MS enable sensitive VOC detection, and why ultrapure, VOC‑free water is essential for accurate results. The note also demonstrates how advanced, multi-stage water purification—especially final VOC-specific polishing—removes contaminants more effectively than standard or bottled water, ensuring reliable analytical performance.