Pakchoi is a vegetable grown and used widely in Vietnam and Southeast Asian countries. This vegetable has long been widely known for its ability to accumulate metals from soil, water, ... and these metals themselves can play a significant role in identifying the geographical area of Pakchoi. Applying this characteristic, the content of 27 metals in irrigation water at a total of 9 Pakchoi growing locations regularly serving the Hanoi market from September 2022 to May 2024 was analyzed using ICP-MS. The analytical results were used to build a model to distinguish the geographical location of Pakchoi growing areas. Among the analyzed metals, Mg, Ti, V, Mn, Rb, Mo, As, Cd, Ba, and Pb were shown to be the metals that play an important role in identifying Pakchoi growing areas in Hanoi. The obtained model gave good discrimination results of up to 100% and completely identified the prepared samples for prediction. The results of this study provide a model to help determine the geographical origin of Pakchoi through the metal composition of irrigation water and, at the same time, contribute as a reference for determining the origin of other vegetable crops in the food market.