Environmental Management

Why SUMCO Addresses Environmental Issues

From energy-saving initiatives to curbing greenhouse gas emissions and reducing waste, lowering the environmental load by the business activities of companies is a pressing task to ensure that the global environment is maintained and protected.

To ensure that the irreplaceable global environment is passed on to future generations, the SUMCO Group has established an environmental management system. We have obtained ISO14001 certification for all of our plants, and pursue initiatives aimed at protecting the environment.

SUMCO Basic Environmental Policy

1. Fundamental Environmental Philosophy

As a manufacturer of high-quality silicon wafers for semiconductors and quartz crucibles, we have established the following guidelines for action to ensure that we pass on this irreplaceable global environment to future generations.

2. Environmental Action Guidelines

  1. Climate change
    1. We shall strive to reduce greenhouse gas emissions across our entire supply chain, including logistics.
  2. Resource Circulation
    1. We shall strive to reduce waste generation and expand recycling.
    2. We shall strive to make effective use of water in our business activities.
  3. Coexistence with Nature
    1. We shall strive to prevent pollution, conserve the global environment and coexist with the local community in all our business activities.
    2. We shall strive to give consideration to biodiversity and its conservation.
    3. We shall strive to achieve zero deforestation in factory locations and production activities.
  4. Others
    1. We shall promote green procurement with our suppliers and reduce environmental impact.
    2. We shall comply with environmental laws, regulations, ordinances and other agreed-upon requirements.
    3. We shall promote continuous improvement of our environmental management system by setting environmental goals and reviewing them regularly.

March 27, 2026
SUMCO CORPORATION
Representative Director, President
Jiro Ryuta

Environmental Management Structure

The SUMCO Group (Japan) has established the Environmental Management Structure in which the Environmental Management Officer, appoints the Company-wide Environmental Manager and the Environmental Managers at site, and defines their roles, responsibilities and authorities.
SUMCO's Environmental Management Officer holds chief responsibility for issues related to the environmental management system and has chief authority regarding those issues. The Environmental Management Officer convenes meetings of the Environmental Management Committee and monitors SUMCO's efforts to address climate change, resource circulation, and coexistence with nature, etc.

Environmental Management System Chart. A hierarchical chart topped by the Environmental Officer, showing a vertical chain of command from managers to employees, supported by cross-functional bodies like the Environmental Management Committee.

Tackling climate change (Net Zero)

Tackling climate change is one of the goals in SDGs, and delinking of economic growth and environmental degradation is strongly required. The SUMCO Group, which supports the growing semiconductor industry, set goals for Net Zero covering Scope 1+2 of SUMCO Group (Japan), in September 2021 toward the realization of a sustainable society, and in February 2024, changed the goal to comply with the SBT(*1)'s 1.5°C scenario from SBT's 2.0°C scenario. In addition, in February 2025, we changed the goal that covers domestic and overseas sites, and set the new goal covering Scope3. As a result, we obtained SBT certification for its Near-Term goals on June 12, 2025.

Target Year 2030 (Near-term Goal) 2050 (Long-term Goal)
Scope1+2 Goals 42% reduction from 2023(6.0% reduction per year)
[in conformity to 1.5℃ scenario of SBT (*1)]		 100% reduction
Scope3 Goals 25% reduction from 2023(3.6% reduction per year)
[in conformity to WB (*2)2℃ scenario of SBT (*1)]		 -
Initiatives
  • Continuous energy-conservation activities
  • Further introduction of more renewable energy (such as Solar power generation, Wind PPA, etc.)
  • Procurement of environmental value (such as Non-Fossil Certificates and J-Credit, etc.)
  • Promotion of initiatives for Net Zero by our suppliers, etc.
  • Science Based Targets
    Reduction targets of greenhouse gas emissions set by companies that comply with the standards of the Paris Agreement.
  • Well-Bellow

Environmental Objectives

The SUMCO Group (Japan) sets environmental objectives for all of its operating bases based on its Basic Environmental Policy and the results of periodic environmental load assessments.
From 2026, we have established new environmental targets in line with the revision of the Basic Environmental Policy and have been working toward achieving them.

2025 Environmental Objectives and Results

Benchmark Objectives Results
Reduction of CO2 emissions
Scope1+2		 Previous year's results 1.1% 1.3%
Reduction of chemical substance use 0.5% 0.6%
Reduction of industrial waste
(reduction of hazardous waste* released)		 2.7%
(0.1%)		 4.3%
(0.11%)
Reduction of water consumption 0.5% 0.6%
  • The result for fiscal year 2025 exceeded each target for reductions in CO2 emissions, usage of chemical substances, emissions of industrial waste, and water consumption. Especially concerning the reduction target for industrial waste emissions, the improvement of water content of sludge (dewatered sludge) has made a significant contribution to the reduction.
  • Hazardous waste is defined as "specially controlled industrial waste" stipulated by the Japanese Waste Management Law.

2026-2030 Environmental Objectives

Environmental Action Guidelines Environmental Objectives 2026
Target		 2030
Mid-term Goal
Climate Change Energy Conservation Initiatives to Promote Net Zero
(Benchmark: 2023 Energy Consumption)		 3.2% 3.5% or more
Resource Circulation Promotion of Waste Recycling 96.0% 96.0% or more
Promotion of Conversion into Valuable Resources of Waste 21.8% 23.8% or more
Stable Maintenance of High-level Water Recycling 38.7% 38.7% or more
Coexistence with Nature Zero Environmental Accidents of Class A and B 0 0
Promotion of Environmental Conservation Activities Implementation of All Planned Activities Implementation of All Planned Activities
Others Thorough Management of Regulated Substances by Suppliers Investigation and Corrective Actions Investigation and Corrective Actions
Thorough Management of Prohibited Substances, etc. Investigation and Corrective Actions Investigation and Corrective Actions
Zero Cases of Regulatory Non-compliance Class A and B 0 0
Promotion of Improvement and Efficiency Enhancement of Core Department Operations
(Achievement Rate Against Planned Items)		 95.0% 95.0% or more

Environmental Risk Management

SUMCO Group (Japan) identifies environmental risks in the Basic Rules on Risk Management, including risk related to climate. Identified risks are incorporated into an initiative plan for environmental risks such as environmental pollution and extreme weather due to global warmings under the BSC and environmental management system. Then, the achievements are reported to the Environmental Management Officer as well as BSC and reviewed by top management.

Environmental Education

Education and Training Targeted at Suppliers to Increase Understanding of the Environmental Policies and Prevent Environmental Accidents

The SUMCO Group (Japan) provides environmental education to supplier of chemicals and other products and to industrial waste treatment firms covering SUMCO's Environmental Policies, prevention of environmental accidents and compliance with laws and ordinances.

In 2025, we conducted group training conducted by the Company, as well as training through document distribution. As for the results of the training, we receive training records from each company to confirm the level of understanding.

Contents of Education

  1. Requests for vehicle inspections to prevent fuel, oil and other substances from leaking
  2. The importance of SUMCO personnel being present at the time of delivery or collection, and request that their instructions be followed
  3. Request for inspection of industrial waste collection vehicles, particularly to prevent leakage or dripping of sludge, liquid waste, etc.
  4. Introduction to actual environmental accidents that occurred at the Company in the past

Environmental Accounting

In accordance with Ministry of the Environment's Environmental Accounting Guidelines 2005, the SUMCO Group (domestic / overseas) calculates the results of our group (Japan) from January 2025 to December 2025.

  • Data of overseas manufacturing sites has been incorporated since 2025.

Environmental Costs

(million yen per year)

Investments 1,952
Expenses*1 15,486
  • Internal labor cost, depreciation expenses and energy costs (electric power, fuel, water, etc.) related to operation are not included.

Environmental Conservation Benefits, Economic Effect

Category (Unit) Environmental Conservation Benefits
(2024-2025)*2		 Economic Effect
(million yen)*3
Electricity consumption (GWh) ▲45 413
Fuel consumption (crude oil equivalent kL) ▲759
Water consumption (Mm3) 0.1
Chemical substance consumption (t) ▲192
Industrial waste emissions (t) 100
  • The negative value indicates that the increase in environmental loads exceeded reductions due to increases of production volume and trial productions that does not contribute to sales.
  • Calculated by our original estimating method.

Environmental Audits

Through the SUMCO Group(domestic / overseas) , internal environmental audits are conducted by internal auditors, while environmental management system audits are implemented by an outside review organization.

Internal Environmental Audit

Internal environmental audits are annually conducted by internal auditors for all organizations in the SUMCO Group (domestic / overseas) subject to the Company's environmental management system. The results are reported to the Environmental Management Officer and reflected in the following year's activities to enable continuous improvement of the environmental management system.

Environmental Management System Audit

The SUMCO Group(domestic / overseas) is subject to regular audits conducted every year and a renewal audit conducted every three years for ISO 14001 certification by an external independent auditor.

Compliance with Environmental Legislation

The SUMCO Group(domestic / overseas) identifies the requirements of laws, regulations and agreements and verifies compliance. None of the items which is incompliance with laws and regulations were found in 2025.

We also ensure compliance with overseas chemical substance regulations, namely the Restriction on Hazardous Substances (RoHS) Directive and Regulation on Registration, Evaluation, Authorization and Restriction of Chemical Substances (REACH).

State of Compliance with Environmental Laws and Regulations SUMCO Group (domestic / overseas)

5 years prior
(2021)		 4 years prior
(2022)		 3 years prior
(2023)		 2 years prior
(2024)		 Last year
(2025)
Violations 0 0 0 0 0
Fines [yen] 0 0 0 0 0

Progress of Soil and Groundwater Contamination Countermeasures

  • Accumulated Amount of Contaminated Substances Recovered Annually from Groundwater at the Noda Plant

    Stacked bar chart of cumulative groundwater pollutant recovery (2006–2025). It shows the recovery totals for four substances, including Tetrachloroethylene.

  • SUMCO Group (Japan) conducts soil and groundwater contamination surveys at all facility sites.

    In a voluntary survey implemented at the Noda site in 2005, it was found that amounts of volatile organic compounds (VOC) and fluorine exceeded the soil and groundwater environmental standard values. We have been pursuing countermeasures in consultation with relevant parties. At present, we are working to prevent the spread of and recover contaminated substances by using a pumping well set up near the boundary of the plant grounds.

    In fiscal year 2025, there were no new incidents related to industrial water/wastewater across SUMCO Group (Japan).

ISO 14001 Management System Certificate

ISO 14001 Management System Certificate(1,087KB)
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Sustainability

Executive Officer Message Materiality (Key Issues) The SUMCO Group's Business Activities and the Sustainable Development Goals (SDGs) Related Policies CSR and Sustainability Promotion Structure Environmental Social Governance SUMCO Vision Disclosure Based on TCFD Recommendations Disclosure Based on TNFD Recommendations Site Data Sustainability Report / CSR Report To ESG-oriented Investors