Tap water is the sole water source for all of iST's plants, with no groundwater used. Water consumption is primarily for domestic use, air conditioning cooling water, and a small amount of pure water for the labs. Consequently, there is no demand for high-volume water consumption. According to the World Resources Institute (WRI) Aqueduct Water Risk Atlas assessment, our plants are located in low-to-medium water risk areas rather than water-stressed areas; thus, they have had no significant impact on water resources or the ecological environment in the water source area.

Total water withdrawal in 2025 was 89.842 thousand tons, representing a 3.32% decrease in water intensity compared to 2022, achieving the 1% reduction target. We will continue to enhance overall water efficiency through the three strategies of "reduction, reuse, and recycling".

To address drought or water shortage risks, iST has established a water shortage response mechanism. Upon receiving notifications regarding droughts, water rationing, or supply interruptions, the Company immediately activates a cross-departmental response team. This team notifies all units to cooperate with water conservation efforts and sequentially plans water rationing or cut-off measures, as well as the priority sequence for the plant-wide water supply system. During such periods, iST fully complies with government water rationing policies, strengthens water conservation advocacy, and suspends non-essential water use to mitigate operational impacts and ensure a stable water supply.