Water Risk Management

Water Risk Management Policy

Water resource issues differ according to the region in terms of such things as the balance of supply and demand, the volume of water intake, and water quality. Taking advice from external experts, KIOXIA is analyzing water risks which have the potential to materialize up to the year 2040 in each area of our manufacturing operations; this is aimed at ascertaining the risks in terms of the supply-demand balance, natural disasters and other issues applicable to each region, and we are progressing the implementation of all necessary countermeasures.


Meanwhile, we intake water from rivers near our manufacturing operations in Japan. Under the concept of purifying and returning, we have established voluntary standards for wastewater that are stricter than those laid down in law, striving to reduce the impact on the surrounding environment.

Monitoring System

1. Items specified by laws and regulations

In each of its manufacturing operations, KIOXIA deploys automatic analyzers performing around-the-clock monitoring of wastewater and waste gases including nitrogen oxide (NOx), sulfur oxide (SOx), total nitrogen (T-N), total phosphorus (T-P), chemical oxygen demand (COD), suspended solids (SS), fluorine, and power of hydrogen (pH). Other items are monitored by sampling.


2. Analysis Center

We analyze approximately 38,000 samples per year at our Analysis Center in Yokkaichi Plant.

Wastewater voluntary rules

We continuously manage the water and gas discharged by Yokkaichi Plant under our own voluntary guidelines to ensure compliance with all appropriate laws and regulations.

COD guidelines

Law (Water Pollution Prevention Act.)  ≦120mg/l,  Mie Prefecture Ordinance  ≦20 mg/l,  Yokkaichi-city Pollution Prevention Agreement  ≦4.5 mg/l,  Voluntary guideline of KIOXIA Yokkaichi Plant  ≦4.0 mg/l,  Actual on FY2019  3.1 mg/l

Evaluating Water Risk

KIOXIA’s manufacturing operations use large quantities of water, so we have commissioned outside experts to evaluate water-related risks from the perspective of current and future water supply and demand risks. The assessment of risks was carried out using tools such as the World Resources Institute’s WRI Aqueduct and the World Wide Fund for Nature’s Water Risk Filter.


The outcome of the assessment of our manufacturing operations was confirmation that these are not exposed to any water risk likely to have any practical financial or strategic impact prior to the year 2040. This assessment was based on investigations into such matters as the water supply and demand risk (based on the status of seasonal changes, drought frequency, water storage capacity and water source protection), water disaster risk (such as flooding or landslide sediment damage) and regional vulnerability to water pollution that might endanger public health or ecosystems.

Water-related Targets and Results

KIOXIA has set an output intensity target for the reduction of water intake per gigabyte (GB) using FY2013 as the standard, and we manage this using a PDCA cycle.


We set a target of 35.2% or lower for FY2019 and achieved this goal with an actual result of 27.3%.


Going forward, we will continue to promote activities aimed at achieving water intake reduction targets, by both reducing water consumption and by promoting recycling.

Introducing the sustainability activities of the KIOXIA Group which contribute to the development of a sustainable society.

KIOXIA Group will continue to develop a sustainable society by contributing to the SDGs through its business.