Tokyo Water

What Tokyo Water does

Tokyo Water Co., Ltd. (東京水道株式会社) is a Tokyo-based water utility services company headquartered in Shinjuku, approximately 80.4% owned by the Tokyo Metropolitan Government's Bureau of Waterworks. Founded in 1966 and reorganized into its current comprehensive-services form in April 2020, the company employs approximately 2,800 people and operates with a stated capital of ¥100,000,000. It functions as the primary operational contractor supporting the Bureau's municipal water infrastructure across the Tokyo metropolitan area, progressively managing 16 of 21 Bureau office locations as of 2026.

The company's core offerings span pipeline construction and maintenance, water purification plant operation, customer service operations, IT system support, and consulting. Its technology stack is anchored by proprietary assets including the TS Leak Checker (recognized by the IWA in 2010) and the Pipe Refresh Cleaning Method co-developed with Kubota. The business model is predominantly business-to-government (B2G), with revenue derived from comprehensive outsourcing contracts with the Tokyo Metropolitan Government. Pricing is contract-based rather than transactional, with scope expansion occurring through office-level mandate growth rather than new logos.

Tokyo Water has extended operations beyond its Tokyo anchor into Myanmar, India, and Rwanda, and has launched adjacent product lines including smart meter services and data center operations. The company holds Privacy Mark and ISO certifications obtained between 2023 and 2025, and provides disaster response support such as the 2024 Noto Peninsula Earthquake recovery effort. Its competitive position is reinforced by deep operational embedding in Tokyo's water network, five decades of accumulated infrastructure data, and ownership alignment with its primary counterparty.

Name

Tokyo Water

Legal name

東京水道株式会社

Website

https://tokyowater.co.jp

Company type

Private

Founded year

1966

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Tokyo Water Co., Ltd. is a Tokyo-based water utility services company majority-owned by the Tokyo Metropolitan Government, providing pipeline maintenance, purification plant operations, IT systems support, and consulting to Japan's largest municipal water authority.

Ownership category

akta.pro rank

Product category

Water Utility Services

NAICS

Water, Sewage and Other Systems (2213), Water Supply and Irrigation Systems (22131), Water Supply and Irrigation Systems (221310), Administration of Air and Water Resource and Solid Waste Management Programs (92411)

SIC

Water Supply (4941), Electric, Gas & Sanitary Services (4900), Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Water Supply & Wastewater Utilities Administration (BPAIACAG)

akta.pro secondary industries

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ), Water, Wastewater & Hydraulics Engineering Consulting (BPAHAIAD), Water Reuse & Reclamation Infrastructure Construction (Recycled Water Systems) (IMAFAGAH), Water Resources, WASH & Integrated Water Management (BPADALAH)

Keywords

• Water utility services
• Pipeline construction
• Water infrastructure management
• Leak detection technology
• Water supply operations

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Others

Revenue model

1. Water Supply Operations and Management Contracts: Tokyo Water operates as a policy collaborator for the Tokyo Metropolitan Government Bureau of Waterworks, managing transferred operations including pipeline facility management, purification facility management, customer services, IT services, consulting, and research. Revenue is derived from government-entrusted operations and service contracts with the Tokyo Metropolitan Government. The company also provides water supply services to other municipalities domestically and supports water utilities internationally.
2. Public IT Works and System Services: The company provides system maintenance, operation, and IT services to public organizations, including water rate collection systems, call center systems, and data center management for the Tokyo Metropolitan Government Bureau of Waterworks. Also provides IT services to other public organizations (e.g., Tokyo Metropolitan Government Education Department).

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Tokyo Water Co., Ltd. operates as a policy collaborator for the Tokyo Metropolitan Government Bureau of Waterworks, providing comprehensive water supply services across Tokyo. Core offerings include pipeline facility management (research, design, construction supervision), water purification facility and water conservation forest management, leak detection using proprietary TS Leak Checker technology, customer center operations, IT systems for water rate collection, and consulting services for domestic and international water utilities.

Product overview

Tokyo Water (東京水道株式会社) is a comprehensive water supply service provider operating as part of the Tokyo Water Group alongside the Tokyo Metropolitan Government Bureau of Waterworks. The company offers an integrated portfolio of waterworks services organized into four main divisions: Waterworks Technology Business (covering pipeline construction, facility management, pipe maintenance, and water service pipe operations), Customer Service (service offices, customer center management), IT Services (waterworks IT systems, data center management, public IT works), and International Projects (domestic support and overseas assistance). The portfolio is delivered through proprietary equipment like the TS Leak Checker for leak detection, supported by certified quality and information security management systems.

Differentiator

Problem solved

Functional benefit

Products and services

• Water Pipeline Construction Provides pipeline research, design, quantity surveys, and construction supervision services for water pipe renewal and new construction projects, serving municipal water utilities.

Quantifiable outcome

• ~3% or less leakage rate — one of the lowest in the world — achieved through advanced leak detection methods and infrastructure management.
• +2 more outcomes

Named customers2 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Tokyo Metropolitan Government (Bureau of Waterworks)coreStrategic or Co-development PartnerTokyo Water operates as a policy collaborator (政策連携企業) for the Tokyo Metropolitan Government Bureau of Waterworks. The two entities form the 'Tokyo Water Group' as equal partners, with Tokyo Water responsible for technical and management operations transferred from the bureau. They share unified management strategy, conduct joint training programs, and collaborate on crisis management and disaster response. The Tokyo Metropolitan Government holds 80.4% shareholding in Tokyo Water.
• Nihon Water Solution Co., Ltd.coreTechnology or IntegrationJoint development partner for proprietary leak detection equipment including the TS Leak Checker (SV1110) and stick-type TS Leak Checker (SV1110S). These technologies have been recognized internationally (IWA-PIA 2010 East Asia Grand Award) and nationally (Minister of Health, Labour and Welfare Award).
• JICA (Japan International Cooperation Agency)minorStrategic or Co-development PartnerTokyo Water is commissioned by JICA to provide waterworks technological training for overseas participants, dispatch experts to developing countries, and support international water supply projects. Activities include training programs on leak detection, non-revenue water reduction measures, and maintenance of waterworks facilities.
• Union of Japanese Scientists and Engineers (JUSE)minorOthersCertifying body for the company's QMS (JIS Q 9001:2015, Registration no. JUSE-RA-638) and ISMS (JIS Q 27001:2023, Registration no. JUSE-IR-010) certifications.
• Japan Information Technology Service Industry AssociationminorOthersCertifying body for the company's Privacy Mark certification (Registration no. 11820050(14), valid until August 11, 2027).
• JEPLAN, Inc.minorOthersProvider of the BRING UNIFORM uniform recycling system used by Tokyo Water to recycle company uniforms according to their material (chemical recycling/material recycling) to reduce environmental impact. Approximately 1,500 kg of uniforms are recycled annually.

Scale indicators6 records

Recent moves9 records

Expansion highlights5 records

Emerging players

• Organo Corporation: Japanese water treatment and pure water systems provider serving semiconductor, pharmaceutical, and power generation customers with municipal water involvement. Comparable in the Japanese water treatment market with similar technical expertise.
• Metawater Co., Ltd. Japanese water treatment plant equipment manufacturer and operator (formerly a JV between Hitachi and Fuji Electric). Comparable in Japanese water infrastructure market with focus on purification plant equipment and operations, serving similar municipal customers.

Others

• Kubota Corporation: Japanese industrial manufacturer that is a joint development partner with Tokyo Water on the Pipe Refresh Cleaning Method. Comparable as a domestic water infrastructure technology provider and equipment supplier, though operating in a different vertical.
• Hitachi High-Tech Solutions Corporation: Joint development partner with Tokyo Water on hydraulic and water quality measurement equipment. Comparable as a technology vendor for water utility measurement and IT solutions, supporting similar municipal utility customers in Japan.
• JFE Engineering Corporation: Japanese engineering and construction company with significant water and wastewater infrastructure construction business. Comparable as a domestic provider of water infrastructure construction and engineering services to Japanese municipalities.

Broad incumbents

• Kurita Water Industries Ltd. Major Japanese industrial water and process treatment company with municipal water supply involvement. Comparable as a Japan-based water technology and services provider serving both industrial and municipal segments.
• SUEZ SA: Global water and waste management utility services provider operating in municipal water supply, treatment, and network management. Comparable to Tokyo Water as a comprehensive outsourced operator of municipal water systems, though at a much larger global scale.
• Veolia Environnement S.A. Global environmental services group with extensive municipal water utility services, including network management, customer service, and water treatment operations. Directly comparable as a comprehensive B2G water utility services provider with similar managed services model.

Direct peers

• Nihon Water Solution Co., Ltd. Japanese water leak detection technology company that jointly developed the TS Leak Checker with Tokyo Water. Comparable as a domestic peer specializing in water pipe inspection and leak detection services for Japanese water utilities.
• Yokohama Water Co., Ltd. Yokohama Water is a local government-affiliated comprehensive water services company, similar in structure and services to Tokyo Water. Directly comparable as a Japanese water utility services provider operating on behalf of a major municipal government.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/Tokyo_Water_Co
• YouTubeyoutube.com/@%E6%9D%B1%E4%BA%AC%E6%B0%B4%E9%81%93%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE
• Facebookfacebook.com/Tokyo.Water.Co

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Tokyo Water