Company Information
Officers
Directors (excluding those who are members of the Audit and Supervisory Committee)

Representative Director and Chairperson
NOMURA Yoshikazu
View Career Summary
- Apr. 1971
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Joined the Company
- Dec. 2003
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Director
Chief of Sewerage Engineering Headquarters and Sewerage Engineering East Headquarters - Dec. 2005
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Managing Director
Chief of Sewerage Engineering Headquarters and Sewerage Engineering East Headquarters - Dec. 2007
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Director and Vice President
- Dec. 2009
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Representative Director and President
- Mar. 2019
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Representative Director and Chairperson (current position)
- Apr. 2020
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Chairperson (Representative Director) of the Federation of Japanese Industry of Sewerage Service for Sustainable Society (current position)
- Jul. 2020
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Director of the Nissuicon Water Value-Up Foundation (currently Innovation Foundation for Water and Regional Revitalization) (current position)

Representative Director and President
NAKANISHI Shinji
View Career Summary
- Apr. 1985
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Joined the Company
- Apr. 2019
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Corporate Officer
Manager of Water Supply Engineering Division - Mar. 2021
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Director
Corporate Officer
Chief of Sales Division - Apr. 2021
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Director
Corporate Officer
Chief of Business Development Headquarters and Manager of Eastern Region Supervisory Division - Apr. 2022
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Director
Managing Corporate Officer
Chief of Business Development Headquarters and Manager of Eastern Region Supervisory Division - Apr. 2023
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Director
Managing Corporate Officer
Chief of Business Development Headquarters - Jan. 2025
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Director
Managing Corporate Officer
Executive Supervisory Coordinator of Business Development Headquarters - Mar. 2025
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Representative Director and President (current position)
- Jun. 2025
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Chairperson of the Association Of Water And Sewage Works Consultants Japan (current position)

Director
KOISHIKAWA Nobuaki
View Career Summary
- Apr. 1974
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Joined the Company
- Dec. 2005
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Director
Chief of Sewerage Engineering West Headquarters - Dec. 2009
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Managing Director
Corporate Officer
Chief of Business Management Headquarters - Dec. 2013
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Director
Senior Managing Corporate Officer
Chief of General Affairs Headquarters - Mar. 2015
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Representative Director and Vice President
Corporate Officer
Chief of Administration Headquarters - Mar. 2019
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Executive Corporate Advisor
- Mar. 2021
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Director
Senior Managing Corporate Officer
Chief of Administration Headquarters - Apr. 2021
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Director
Senior Managing Corporate Officer
Chief of Corporate Headquarters - Apr. 2023
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Director
Senior Managing Corporate Officer
Chief of Corporate Headquarters and Manager of Internal Control Division (current position)

Director
TANEICHI Naohito
View Career Summary
- Apr. 1986
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Joined the Company
- Apr. 2015
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Corporate Officer
Manager of Sewerage Engineering Division - Apr. 2018
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Corporate Officer
Manager of Sewerage Engineering Division and Business Planning Department, Business Management Headquarters - Apr. 2019
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Corporate Advisor of Sewerage Engineering Division
- Apr. 2023
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Managing Director and Corporate Officer
Chief of Consulting Headquarters - Mar. 2025
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Director
Managing Director and Corporate Officer
Chief of Consulting Headquarters (current position)

Outside Director
OGAWA Kenichi
View Career Summary
- Apr. 1977
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Joined the Tokyo Metropolitan Government
- Jul. 2012
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Director General of the Bureau of Waterworks
- Sep. 2013
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Representative Director and President of Tokyo Metropolitan Sewerage Service Corporation
- Jun. 2017
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Chairperson of the Japan Pipe Rehabilitation Quality Assurance Association
- May 2018
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President of Sewage Works Maintenance Cooperation
- Mar. 2023
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Outside Director of the Company (current position)
- Jun. 2025
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Executive Advisor of S・P・R・RENTAL CORPORATION (current position)
Directors Constituting Members of Audit and Supervisory Committee

Director
Audit and Supervisory Committee Member
HARU Koichiro
View Career Summary
- Apr. 1984
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Joined Central Consultant Inc.
- Jan. 1994
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Joined the Company
- Dec. 2011
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Corporate Officer
Chief of Sewerage Engineering Headquarters and Eastern Region Sewerage Engineering Division - Apr. 2012
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Corporate Officer
Manager of Sewerage Engineering Division - Dec. 2013
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Director
Managing Corporate Officer
Chief of Business Management Division - Mar. 2019
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Director
Managing Corporate Officer
Chief of Administration Headquarters - Mar. 2021
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Corporate Auditor
- Sep. 2021
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Corporate Auditor of PT.DACREA Design And Engineering Consultants (current position)
- Mar. 2022
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Corporate Auditor of NSC TEC Co., Ltd. (current position)
- Mar. 2022
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Corporate Auditor of Sabo Engineering Co., Ltd. (current position)
- Mar. 2023
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Director
Audit and Supervisory Committee Member of the Company (current position)

Outside Director
Audit and Supervisory Committee Member
TAKATA Hirohisa
View Career Summary
- Apr. 1985
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Joined Japan Development Bank (currently Development Bank of Japan Inc.)
- Jun. 2012
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General Manager of Corporate Auditor’s Office, Development Bank of Japan Inc.
- Jul. 2019
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Registered as a certified public accountant
- Nov. 2022
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Opened Hirohisa Takata Certified Public Accountant Office (current position)
- Dec. 2022
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Registered as a tax accountant
- Mar. 2023
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Outside Director
Audit and Supervisory Committee Member of the Company (current position) - May 2023
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Standing Audit and Supervisory Board Member of PR TIMES Corporation. (current position)

Outside Director
Audit and Supervisory Committee Member
MATSUDA Yuki
View Career Summary
- Apr. 2004
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Joined the Legal Training and Research Institute of Japan
- Oct. 2005
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Registered as an attorney-at-law
- Jan. 2016
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Joined Sunrise Law Office (current position)
- Mar. 2017
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Outside Director of Nippon Aqua Co., Ltd.
- May 2017
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Outside Director of Azplanning Co., Ltd.
- Feb. 2021
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Deputy Secretary General of Japan Federation of Bar Associations
- May 2022
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Outside Director
Audit and Supervisory Committee Member of Azplanning Co., Ltd. - Mar. 2023
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Outside Director
Audit and Supervisory Committee Member of the Company (current position) - Mar. 2023
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Outside Director
Audit and Supervisory Committee Member of Nippon Aqua Co., Ltd. (current position) - Dec. 2024
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Outside Director
Audit and Supervisory Committee Member of TEMONA. Inc. (current position)
Corporate Officers
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Senior Managing Director and Corporate Officer
Chief of Corporate Headquarters
Manager of Internal Control Division -
KOISHIKAWA Nobuaki
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Managing Director and Corporate Officer
Chief of Infrastructure Management Headquarters
Head of Central Research Institute
person responsible for the management of construction work in accordance with the Construction Business Act -
NOMURA Kyogo
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Managing Director and Corporate Officer
Chief of Consulting Headquarters -
TANEICHI Naohito
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Managing Director and Corporate Officer
Chief of Business Development Headquarters
Manager of Western Region Supervisory Division -
KONNO Kazuhiro
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Corporate Officer
Deputy Chief of Corporate Headquarters
Manager of Corporate Planning Department -
SUGI Michio
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Corporate Officer
Deputy Chief of Corporate Headquarters
Manager of Finance and Accounting Department -
SAKAI Kazuyuki
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Corporate Officer
Deputy Chief of Corporate Headquarters
Manager of Information Technology Planning Department -
SATO Shinichi
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Corporate Officer
Manager of Eastern Region Supervisory Division, Business Development Headquarters
Manager of Tokyo Branch -
YOSHINARI Daigo
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Corporate Officer
Manager of Overseas Supervisory Division, Business Development Headquarters -
DOMICHI Masaharu
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Corporate Officer
Manager of Incubation Division, Infrastructure Management Headquarters -
FUKUHARA Masaru
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Corporate Officer
Manager of Digital Transformation Innovation Division, Infrastructure Management Headquarters
Manager of Solution Development Department -
GOTO Mitsuhiko
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Corporate Officer
Deputy Chief of Consulting Headquarters -
KINKAI Hideki
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Corporate Officer
Manager of Water Supply Engineering Division, Consulting Headquarters -
MIYAMOTO Katsutoshi
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Corporate Officer
Manager of Sewerage Engineering Division, Consulting Headquarters -
MORINAGA Koji
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Corporate Officer
Manager of River Basin Water Management Division, Consulting Headquarters -
YAMAMOTO Seiji
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Corporate Officer
Manager of Architectural Engineering Division, Consulting Headquarters -
MASUDA Tamon
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Corporate Officer
Manager of Mechanical and Electrical Engineering Division, Consulting Headquarters -
IKEDA Kenji
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Corporate Officer
Manager of Overseas Division, Consulting Headquarters -
AKASAKA Kazutoshi