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Corporate InformationSustainability

Water Conservation

Hitachi uses water in such production processes as cleaning, cooling, and painting. To reduce water usage through greater efficiency, we are enhancing our level of water management by installing flow meters at more locations, introducing wastewater treatment devices to increase the use of recycled water, and upgrading water supply facilities at our business sites.

Different countries and regions are affected by water-related issues in different ways, so we devise appropriate counter­measures for each region. Our business sites in China, India, and the Philippines, for example, are striving to reduce the volume of water used by strengthening measures against water leakage.

Actions and Achievements

In fiscal 2016, we set a target of a 23% reduction (over the base year of fiscal 2005) for water usage per unit at our 204 global sites and achieved a 27% reduction.

Key Indicators

Reduction in Water Usage per Unit


Water Usage

Graph of Water Usage (Click the link below for this data in table format.)

Includes 2.12 million m3/year used by a materials company that became a consolidated member of the Hitachi Group in fiscal 2016.

Next Steps to Improve Water Usage Efficiency

Hitachi has set a target of enhancing water usage efficiency in fiscal 2050 by 50% compared to fiscal 2010. We will aim to realize a resource efficient society by maintaining appropriate management of our business-related water usage and taking measures to solve each region's water-related issues, such as by reducing water intake quantity and promoting the circulative use of water through the purification and reuse of wastewater.

Reducing Water Use Through Improved Efficiency

Reducing Water Use in the Manufacture of Hybrid Vehicle Batteries (Hitachi Vehicle Energy, Ltd.)

Recirculation System Flowchart for Pure Water Used in Rinsing

Hitachi Vehicle Energy has reduced the amount of water used in manufacturing lithium-ion batteries for hybrid vehicles by circulating and reusing the pure water*1 utilized in rinsing. Deionized water that has been used in the rinsing process is mixed with makeup water (deionized water) in a recirculation tank, and then subjected to ultraviolet decomposition, filtering, and ion exchange. Through this cycle, it can be repeatedly used as rinse water. As a result, industrial wastewater and water usage have been slashed by more than 99%, compared with the amount used before the system was introduced.

Deionized water: Water from which the impurities have been removed using an ion exchange resin, reverse osmosis membrane, distiller or other means.

Fixing Leaks to Reduce Water Usage at a Washing Machine Manufacturing Site (Shanghai Hitachi Household Appliances Co., Ltd.)

An automatic washing machine acceptance test.

Shanghai Hitachi Household Appliances produces about 1 million automatic washing machines each year and uses large amounts of water in quality checks during acceptance tests. To reduce the amount of water used, the company spent six months conducting repeated surveys, checks, improvements, and verifications and located the places where water was leaking through the monitoring of underground pipes and the installation of more meters. It implemented water-saving activities, replacing leaking underground pipes and repairing and updating air conditioning equipment. As a result, the company now uses only half the water it did in the past. To prevent the recurrence of water leaks, the pipe routing was changed so that pipes are now above ground with fewer joints.

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