The Yokogawa Group has achieved ISO 14001 certification primarily at its major offices and manufacturing sites in Japan and abroad.
As of October 2019
| Company name | Countries | Certified Year | |
|---|---|---|---|
| Yokogawa Electric Corporation | Japan | 1997 | |
| Yokogawa Manufacturing Corporation | Japan | 1997 | |
| Yokogawa Test & Measurement Corporation | Japan | 1997 | |
| Yokogawa Solution Service Corporation | Japan | 2000 | |
| Yokogawa Shanghai Instrumentation Co., Ltd. | China | 2003 | |
| Yokogawa Sichuan Instrument Co., Ltd. | China | 2000 | |
| Yokogawa Electric China Co., Ltd. | China | 2004 | |
| Yokogawa Electronics Manufacturing Korea Co., Ltd. | South Korea | 2004 | |
| Yokogawa Electric International Pte. Ltd. | Singapore | 2016 | |
| Yokogawa Engineering Asia Pte. Ltd. | Singapore | 2001 | |
| Yokogawa Electric Asia Pte. Ltd. | Singapore | 1998 | |
| Yokogawa Philippines, Incorporated | Philippines | 2007 | |
| P.T. Yokogawa Indonesia | Indonesia | 2015 | |
| P.T. Yokogawa Manufacturing Batam | Indonesia | 2000 | |
| Yokogawa (Thailand) Ltd. | Thailand | 2015 | |
| Rota Yokogawa GmbH & Co.KG | Germany | 2011 | |
| Yokogawa Corporation of America | USA | 2005 | |
| Yokogawa Canada, Inc. | Canada | 2015 | |
| Yokogawa de Mexico, S.A. de C.V. | Mexico | 2015 | |
| Yokogawa America do Sul Ltda. | Chile | 2015 | |
| Yokogawa Colombia S.A.S. | Colombia | 2015 | |
| Yokogawa Middle East & Africa B.S.C.(c) | Bahrain | 2013 | |
| Yokogawa Engineering Bahrain SPC | Bahrain | 2013 | |
| Yokogawa Middle East & Africa B.S.C (Closed-Abu Dhabi) | UAE | 2013 | |
| Yokogawa Engineering Middle East & Africa FZE | UAE | 2013 | |
| Yokogawa Saudi Arabia Company | Saudi Arabia | 2013 | |
| Yokogawa Services Saudi Arabia Company | Saudi Arabia | 2013 | |
| Yokogawa Oman Limited L.L.C. | Oman | 2013 | |
| Yokogawa Middle East & Africa B.S.C. (c) | Qatar | 2013 | |
Yokogawa Electric Corporation and Yokogawa Manufacturing (covered branches: Headquarters, Kofu Factory, Komagane Factory, Kanazawa Factory and Komine Factory) has integrated the ISO14001 certification.