To improve water-use efficiency, the Company shall properly and sustainably utilize water resources and establish relevant management measures. It shall strengthen environmental protection and treatment facilities, minimize adverse impacts on human health and the environment, and adopt best available pollution prevention and control technologies and measures.
Water Consumption
TA YA withdraws water from municipal water supplies and collected rainwater. In 2025, total water withdrawal amounted to 96,692 metric tons, an increase of 1,983 metric tons, or 2%, compared with 2024. Water use intensity, calculated as water withdrawal (m³) per annual production volume (metric ton), was 2.24 m³/metric ton, representing a year-on-year increase of 1.6%.
Water Resource Risks
TA YA uses the Aqueduct Water Risk Atlas to assess water-related risks across its operating sites. Both the Guanmiao Plant and Taipei Branch are located in areas classified as Low-Medium Water Risk. Water Stress at both locations is rated Low-Medium (10–20%), while Water Depletion is rated Low (<5%).
The Zengwen–Nanhua Reservoir Interconnection Project officially commenced water supply in 2026, enhancing water supply resilience and flexibility in water resource allocation across Tainan City. As TA YA’s Guanmiao Plant is located within the Nanhua Reservoir water supply area, the interconnection project enables cross-reservoir water transfers to support the Nanhua water supply system during dry periods. This helps reduce the risk of water supply restrictions caused by insufficient storage in the Nanhua Reservoir, improve the stability of water supply to the Guanmiao Plant, and mitigate the potential impact of drought on production and operations.
Waste water treatment
In 2024, the Group discharged 125,534 tons of wastewater to water treatment plants and then into nearby water bodies and discharged 12,270 tons of wastewater to water treatment plants. All production sites regularly conduct water quality testing to ensure that discharged water does not impact local water bodies or ecosystems.
Ta Ya has established the Water Pollution Prevention and Control Operating Procedures, defining operational standards and control measures for wastewater treatment processes at the Guanmiao Headquarters to meet environmental regulations. Ta Ya also commissions government-approved environmental testing agencies to regularly test the water quality of on-site water and effluents, with periodic reporting. Wastewater from the Guanmiao Site is treated internally before being discharged into roadside ditches, ultimately flowing into the Erren River Basin. Wastewater from Cuprime flows into the Fusen Stream, while wastewater from the Taipei Branch, Union Storage, and Ta Ya Venture Capital is treated by the New Taipei Industrial Park Wastewater Treatment Plant. UEI's wastewater is discharged to the wastewater treatment plant in the southern area of Huaya Industrial Park.
Water Saving Initiatives
To conserve water and monitor the condition of water tanks, Ta Ya has established inspection checklists and conducted weekly inspections. Future inspections will be extended to cooling towers and air compressors, with items under development. Other water-saving measures at operational sites include:
1.Rainwater harvesting project.
2.Water circulation and recycling in the mixing plant.
3.Water circulation and recycling in the tin plating plant.
4.Wastewater recycling in the paint production line.
5.Rainwater and wastewater separation project under planning.
