Environmental Sustainability｜Water Management
Nuvoton actively reduce the environmental impact of our business operations by investing in innovative technologies and initiating layouts for renewable energy and net carbon zero emissions. We enhance resource use efficiency and implement waste management to respond to the continuously evolving international environmental regulations, extreme climate events, and other risks. By estimating financial impacts and planning management costs in advance, we formulate environmental strategies and build operational resilience for the company.
48.8
％
Approved SBTi Near-Term Target: Commitment to Reduce Scope 1 and 2 Emissions by 2030 Compared to the 2022 Baseline
25
%
Approved SBTi Near-Term Target: Commitment to Reduce Scope 3 Emissions by 2030 Compared to the 2023 Baseline
1163000
kWh
Nuvoton Taiwan's Annual Electricity Saving Achievement in 2024
Water Resource Management
Nuvoton Technology adopts "source reduction, process water recycling, stable water supply, and compliant discharge" as the core strategies for water resource management. Through annual management targets, water-saving projects, water balance assessments, and water quality monitoring mechanisms, the Company integrates water resource management into its daily operations and production management processes. Nuvoton regularly reviews the performance of water withdrawal, water consumption, water discharge, and water recycling across its sites. For items that do not meet the targets, the Company conducts root cause analysis and formulates improvement measures to continuously enhance water-use efficiency and reduce the impact of its operations on local water resources.
Water-Saving Measures and Reduction Performance
%
Nuvoton Taiwan implemented various water-saving measures in 2025, achieving annual water savings of 7.3 million liters, equivalent to 1.7% of the previous year's water withdrawal.
%
Nuvoton Japan reduced water withdrawal by 12.6% in 2025 compared with the previous year through production allocation adjustments among sites, resulting in total water savings of 443 million liters.
In 2025, Nuvoton's total water withdrawal decreased by 11% compared with the previous year and by 33.5% compared with 2022. Total water discharge decreased by 14.5% compared with the previous year and by 37.4% compared with 2022, demonstrating the effectiveness of the Company's continued efforts in water conservation management, process optimization, and water recycling.
Water Sources and Recycling Rate
In 2025, Nuvoton Taiwan sourced approximately 99.5% of its water from municipal water supplies, while recycled rainwater and air-conditioning condensate accounted for approximately 0.5% as secondary water sources. The overall water recycling rate at the Taiwan production site was 66.7%, based on the water balance assessment submitted to the Hsinchu Science Park Administration. Nuvoton Japan primarily sourced water from groundwater (97.9%) and municipal water supplies (2.1%), and continued to implement water management measures to improve water-use efficiency and reduce water consumption.
Water Resource Usage1, 2
Nuvoton's Total Water Withdrawal (2022 - 2025)
1 Nuvoton Taiwan derives its water supply from municipal sources and surface water, including harvested rainwater; both are classified as freshwater (with total dissolved solids ≤ 1,000 mg/L). The company does not engage in the extraction of groundwater, seawater, produced water, or other third-party water sources. Conversely, Nuvoton Japan obtains its water supply from groundwater and municipal sources, which are also classified as freshwater (with total dissolved solids ≤ 1,000 mg/L), and does not extract water from surface sources, seawater, produced water, or third-party sources. The total volume of water withdrawal encompasses the aggregate quantities sourced from municipal, surface, and groundwater, as well as seawater, produced water, and third-party sources.
2 Nuvoton Taiwan directs all effluent to third-party sewage treatment plants, ensuring there are no discharges to surface water, groundwater, or seawater. The effluent from Nuvoton Japan is similarly directed to surface water and third-party sewage treatment plants, with no discharge into groundwater or seawater. The total discharge volume is calculated based on the aggregate quantities from surface water, groundwater, seawater, and third-party wastewater treatment facilities. Both Nuvoton Taiwan and Nuvoton Japan's effluent is classified as freshwater (with total dissolved solids ≤ 1,000 mg/L).
Water Risk Management
Nuvoton applies the World Resources Institute (WRI) Aqueduct Water Risk Atlas to assess water-related risks. Results indicate that none of Nuvoton’s major production sites in Taiwan and Japan are located in areas classified as high or extremely high water stress, and no seawater is used in operations. These results suggest that the Company poses relatively low risk to local water resources.
Upstream Water Supply Management
Nuvoton Taiwan reviews reservoir conditions monthly. When effective water volume falls below the alert level, Nuvoton initiates alternative water source evaluation and allocation procedures. Nuvoton Japan regularly monitors well water levels to ensure stable supply.
Downstream Discharge Management
Nuvoton Taiwan continuously monitors discharge water quality and cooperates with inspections conducted by competent authorities to ensure regulatory compliance. Nuvoton Japan conducts wastewater treatment and water quality monitoring in accordance with relevant laws, regulations, and permit requirements to reduce environmental impact.
Water Quality Management and Discharge
Nuvoton places great emphasis on wastewater treatment and water quality management, ensuring that wastewater discharges from all operating sites comply with local regulations, management standards, and permit requirements. No wastewater leakage incidents occurred during the year. Wastewater sources mainly include process wastewater and domestic wastewater, which are collected, monitored, and treated based on the characteristics of each site:
Process Wastewater
Process wastewater mainly comes from cleaning, thin-film formation, etching, photolithography development, diffusion, grinding, and other manufacturing processes. Appropriate treatment procedures, such as neutralization, coagulation and precipitation, filtration, or other applicable methods, are adopted based on wastewater characteristics. After confirming compliance with applicable discharge or sewer acceptance standards, wastewater is discharged to approved treatment facilities or receiving water bodies.
Domestic Wastewater
Domestic wastewater mainly comes from employees’ daily water use. It is collected through site sewer or wastewater collection systems and sent to approved wastewater treatment facilities in accordance with local regulations and permit requirements.
Nuvoton regularly conducts wastewater quality monitoring and sampling analysis. The monitoring items cover key indicators such as suspended solids (SS), chemical oxygen demand (COD), fluoride, ammonia nitrogen, and nitrate nitrogen etc. In addition, Nuvoton cooperates with competent authorities, science park administrations, and third-party testing institutions in audits and inspections. The wastewater discharge testing results of Nuvoton's manufacturing sites in Taiwan and Japan all comply with applicable local regulations and discharge standards, with pollutant concentrations maintained below the regulatory limits. This demonstrates the stable operation and effective management of Nuvoton's wastewater treatment systems. For detailed data, please refer to Appendix 2: Environmental Data.