The HOYA Group endeavors to effectively utilize water resources by reusing water and reducing water usage on a global scale, in accordance with its Fundamental Environmental Policies.
The HOYA Group has set numerical targets in each of its business segments and manages its progress in achieving the targets.
In fiscal 2021, water usage in the HOYA Group was 18,639,000 cubic meters. While both water usage and water usage per unit of net sales both increased from the previous fiscal year due to the recovery from the impact of COVID-19, water usage per unit of net sales decreased from pre-COVID-19 levels. As we have been promoting initiatives to reuse water in recent years, our water reuse ratio has been on an uptrend in the past couple of years. We will continue to make effective use of water resources.
| Unit | FY2014 | FY2015 | FY2016 | FY2017 | FY2018 | FY2019 | FY2020 | FY2021 | |
|---|---|---|---|---|---|---|---|---|---|
| Japan | Thousand cubic meters |
1,185 | 1,183 | 1,098 | 1,008 | 1,071 | 929 | 886 | 866 |
| Overseas | Thousand cubic meters |
16,169 | 16,336 | 15,871 | 16,360 | 16,357 | 16,848 | 14,158 | 17,773 |
| Total | Thousand cubic meters |
17,354 | 17,519 | 16,969 | 17,368 | 17,429 | 17,777 | 15,044 | 18,639 |
| Water usage per unit of net sales |
Thousand cubic meters per billion yen |
35.4 | 34.6 | 35.4 | 32.4 | 30.8 | 30.8 | 27.5 | 28.2 |
| Water reuse ratio |
% | 15% | 16% | 18% | 20% | 21% | 27% | 30% | 30% |
Water usage was calculated targeting production bases, based on the usage of city water, industrial water and groundwater identified by using the data aggregation format shared universally within the HOYA Group.
Initiatives to effectively utilize water resources are being carried out in each business segment. In the photomask manufacturing process, cleaning is performed by using ultrapure water to remove various chemicals and foreign matter. The used water undergoes a process at an effluent treatment facility to be rendered harmless, some of which is subsequently collected and reused. The ultrapure water recycling facility, which consists of adsorbents and reverse osmosis (RO) membranes, makes it possible to reuse water by removing impurities.
