Water Resources
Water is a valuable resource that is directly linked to people's lives and livelihoods. Since the Hachioji Plant, which manufactures semiconductor manufacturing equipment, uses a large amount of water (pure water), we are working to conserve water resources by reducing water consumption and promoting water recycling.
Eco-Factory
Plans and Results (Fiscal 2025)
|
Objectives |
Plans | Indicator / Target | Result (FY2025) |
||
| Reduction of water consumption |
Plan Reduce by 10% Period FY2025-2027 Benchmark 1.39m³/million yen |
Water consumption 1.25m³/million yen |
1.52m³/million yen |
Detail |
City water 36,238m³ Ground water 176,549m³ Other 0m³ |
Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant, Hanno Plant (construction completed in July 2023), Tsuchiura Plant and the Battery Testing Center Fukushima Site [former Furudono Plant] (business transferred in October 2023)
Management of groundwater consumption
To accurately grasp the amount of groundwater used for pure water production, Hachioji Plant has flow sensors installed in manufacturing lines and evaluation areas, constantly monitoring the groundwater consumption. The plant strictly manages the use of water resources based on the obtained data, ensuring water is used effectively.
Reduction of Water Consumption and Water Recycling
All of the water withdrawals are provided using city water and groundwater. In fiscal 2025, we used 212,787 m³ of water. At the Hachioji Plant in particular, wastewater volumes are increasing as the production volume of semiconductor manufacturing equipment that uses a large amount of water (pure water) increases. To promote water recycling, we collect and filter a portion of wastewater and use the filtered water as the raw water for pure water. Going forward, we aim to increase the water recycling rate to 30% by further accelerating this initiative.
Quantity of Water Withdrawal (Water Usage)
| Unit | FY2021 | FY2022 | FY2023 | FY2024 | FY2025 | |
| Quantity of water withdrawal | m³ | 163,662 | 164,150 | 168,685 | 172,482 | 212,787 |
| City water | m³ | 22,144 | 21,989 | 32,721 | 34,000 | 36,238 |
| Ground water | m³ | 141,518 | 142,161 | 135,964 | 138,482 | 176,549 |
| Other* | m³ | 0 | 0 | 0 | 0 | 0 |
|
Water usage production volume intensity |
m³/million yen | 1.61 | 1.48 | 1.59 | 1.39 | 1.52 |
Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant, Hanno Plant (construction completed in July 2023), Tsuchiura Plant and the Battery Testing Center Fukushima Site [former Furudono Plant] (business transferred in October 2023)
* Other: Includes surface water (rivers, lakes, etc.), seawater, rainwater, drainage from other organizations, etc.
Quantity of Water Withdrawal
Water Recycling Rate*¹ from Pure Water Production Facilities
| Unit | FY2021 | FY2022 | FY2023 | FY2024 | FY2025 | |
| Water Recycling Rate* from Pure Water Production Facilities | % | 17.2 | 17.7 | 17.1 | 17.4 | 18.4 |
Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant
* Water recycling rate: Amount recycled/amount used (= raw water input + amount recycled)
Water Risk Assessment
Water stress and water risk are assessed using the World Resources Institute Aqueduct Overall Water Risk Map. The areas where our production plants (Hachioji, Hanno, Tsuchiura, and Furudono) and the production plants of domestic Group companies are located are regions indicated as having “low to medium” water risk. On the other hand, some of the manufacturing sites of our overseas subsidiaries are located in regions indicated as having “extremely high” or “high” water risk. In Japan, we will continue to monitor water stress and water risk periodically while using hazard maps created by local governments.
|
WRI/Aqueduct (4.0) Overall Water Risk Assessment* |
Risk Levels* | |
| Japan |
TOKYO SEIMITSU CO., LTD.★ |
Low-Medium(1-2) |
| Overseas* |
ACCRETECH AMERICA INC. |
Low-Medium(1-2) |
* Overall water risk assessment using “Aqueduct Water Risk Atlas 4.0” of the World Resources Institute
* Risk Levels
Low(0-1)
Low-Medium(1-2)
Medium-high(2-3)
High(3-4)
Extremely high(4-5)
* As for the overseas subsidiaries, the risk was assessed for the region where their head office is located.
★With manufacturing and production functions
Water Quality Standards
Since all of our water discharge is general sewage, none of it is discharged into ocean waters or rivers. We thoroughly conduct water discharge management at each factory to preserve the water environment.
Water Quality Standards
| Unit | FY2021 | FY2022 | FY2023 | FY2024 | FY2025 | |
| BOD | t | 1.87 or less | 2.76 or less | 2.77 or less | 2.34 or less | 3.46 or less |
| Nitrogen content | t | 1.34 or less | 1.44 or less | 1.56 or less | 1.13 or less | 1.80 or less |
| Iodine consumption | t | 0.82 or less | 0.81 or less | 0.73 or less | 1.10 or less | 1.50 or less |
| Suspended solids | t | 3.21 or less | 3.78 or less | 3.96 or less | 3.93 or less | 5.36 or less |
|
Amount of n-Hexane extract |
t | 0.02 or less | 0.05 or less | 0.37 or less | 0.00 or less | 0.00 or less |
| Phosphorus content | t | 0.06 or less | 0.07 or less | 0.08 or less | 0.07 or less | 0.10 or less |
Locations covered: Tokyo Seimitsu Co., Ltd. Hachioji Plant
Environment・Society・Governance
