What Stem does

Stem (株式会社エステム) is a privately held Japanese water treatment services corporation founded in 1970 and headquartered in Nagoya, Aichi Prefecture. The company delivers end-to-end water treatment solutions for industrial factories, municipal sewage and water supply infrastructure, and agricultural/livestock operations across Japan. Its service portfolio spans operations management (regular site visits, full outsourcing, technical support, and 24/7 remote monitoring), plant design and construction, water quality analysis, mechanical maintenance, consulting, and chemical and equipment sales. The proprietary SACRA cloud-based remote monitoring platform functions as the digital infrastructure layer of the offering, providing continuous surveillance, early anomaly detection, and remote technical support across deployed water treatment facilities.

The company employs 251-500 staff, including more than 200 dedicated water treatment specialists, and operates through a national network of 11 offices covering the Chubu, Tokai, Kanto, and Kansai regions. Its go-to-market is sales-led and direct, with inbound phone and web inquiry channels, field-technician-led site visits, and demand generation through case-study content, training seminars, an annual Environmental Forum (running since 1991), and industry exhibitions such as 下水道展 and Nakanet. Revenue is generated through a mix of recurring operations management contracts (including SACRA subscriptions and full outsourcing), one-time plant construction projects, professional services for analysis, maintenance and consulting, and hardware/chemical sales. The firm's customer base is diversified across food manufacturing, chemical, metal processing, printing, automotive parts, waste disposal, livestock, and municipal clients, with documented case outcomes such as 27% power cost reduction, 28% chemical cost reduction, and emergency water quality recovery within 2-3 months at named facilities.

In 2024, Stem was selected for the Ministry of Land, Infrastructure, Transport and Tourism's B-DASH Project for innovative sewer technology demonstration, validating SACRA for disaster-recovery use cases. In December 2025, the firm was named the successful bidder for the Toyohashi Water Purification Plant Re-development Project, marking entry into a major municipal water supply infrastructure contract. The company is led by President & CEO Atsuko Shiozaki.

Name

Stem

Legal name

株式会社-Estem

Website

https://stem.co.jp

Company type

Private

Founded year

1970

Operating status

Operating

Headcount range

251–500 employees

Short description

Stem (株式会社エステム) is a privately held Japanese water treatment services firm founded in 1970 and headquartered in Nagoya. It delivers end-to-end drainage, sewage, and water supply solutions — operations management, plant construction, analysis, maintenance, consulting, and the SACRA cloud remote monitoring platform — to industrial and municipal clients across Japan.

Ownership category

akta.pro rank

Product category

Water Treatment Services

NAICS

Sewage Treatment Facilities (22132), Water Supply and Irrigation Systems (221310), Waste Treatment and Disposal (56221)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623), Totalizing Fluid Meters & Counting Devices (3824)

akta.pro primary industry

Monitoring & Control (Dosing Systems, Remote Monitoring, Sensors) (BPABAJAK)

akta.pro secondary industries

Water Treatment Plant Construction (Drinking Water) (IMAFAGAA), Water & Wastewater Compliance (NPDES/Stormwater, Pretreatment, Drinking Water/SDWA) (EUAHABAB)

Keywords

• Water treatment services
• Wastewater management
• Industrial drainage treatment
• Municipal water infrastructure
• Remote monitoring systems

Headquarters

HQ city

Nagoya

HQ country

Japan

HQ region

Asia

Offices11 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Supply Chain

Revenue model

1. Operation Management Services: Regular site visits, full outsourcing, technical support, and remote monitoring of water treatment plants. Includes SACRA remote monitoring system for 24/7 surveillance.
2. Plant Construction: Design and construction of new drainage treatment facilities, facility upgrades, and equipment renewal projects.
3. Water Quality Analysis: Water quality testing and analysis services for drainage, sewage, and water supply systems.
4. Machinery Maintenance: Equipment repair, maintenance, and parts supply for water treatment machinery including blowers, pumps, and control systems.
5. Consulting: Drainage treatment consulting including process optimization, cost reduction, and facility management standardization.
6. Chemical and Equipment Sales: Sale of treatment chemicals, equipment, and consumables for water treatment operations.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Stem provides total water treatment solutions for industrial factories and municipal facilities in Japan, including drainage (排水), sewage (下水道), and water supply (水道) systems. The company delivers operations management, full outsourcing, technical support, plant construction, water quality analysis, equipment maintenance, consulting, and chemical/equipment sales. Its proprietary SACRA cloud-based remote monitoring platform enables 24/7 surveillance, early anomaly detection, and rapid emergency response for water treatment facilities.

Product overview

Stem is a water treatment total solutions provider offering a unified portfolio of 11 service modules centered around the SACRA remote monitoring and management cloud platform. The core offering comprises operational management of wastewater treatment facilities (including regular visits, full outsourcing, technical support, and remote monitoring), plant construction, water quality analysis, equipment maintenance, consulting, and chemical/equipment sales. SACRA serves as the digital infrastructure layer enabling 24/7 remote surveillance and early anomaly detection, while the human-driven service modules provide on-site management, troubleshooting, and optimization — together delivering end-to-end water treatment health management described as being a 'family doctor for water.'

Differentiator

Problem solved

Functional benefit

Brands

• SACRA: Cloud-based remote monitoring and management system for water treatment facilities, providing 24-hour monitoring, technical support, and remote assistance for wastewater treatment operations.

Products and services

• SACRA Remote Monitoring System Cloud-based remote monitoring and management system that provides 24/7 surveillance of water treatment facilities, enabling real-time trend analysis, early anomaly detection, and remote technical support by Stem's specialists. Designed for industrial factories and municipal treatment plants.
• Operations Management Service Comprehensive operations management of water treatment facilities including regular inspection visits, full outsourcing, technical support, and remote monitoring to ensure stable treatment performance for industrial and municipal clients.
• Full Outsourcing Service Complete delegation of water treatment facility management to Stem, including all operational, maintenance, and regulatory compliance responsibilities for industrial drainage facilities.
• Water Treatment Plant Construction Design and construction of new water treatment facilities, including selection and implementation of appropriate treatment technologies such as biological treatment, pressurized flotation, and coagulation sedimentation for various industrial wastewater types.
• Water Quality Analysis Service Water quality testing and analysis services to monitor pollutant levels, ensure regulatory compliance, and support treatment process optimization for drainage, sewage, and water supply systems.
• Equipment Maintenance & Repair Service Maintenance and repair services for water treatment equipment including aeration blowers, pumps, control panels, and filter presses, along with parts supply.
• Water Treatment Consulting Expert consulting services for water treatment optimization, including facility diagnosis, cost reduction strategies, treatment process improvement, and facility management standardization.
• Chemical and Equipment Sales Supply of treatment chemicals (coagulants, flocculants, sludge dewatering agents) and water treatment equipment and machinery to support facility operations.

Quantifiable outcome

• Power cost reduction of 27% achieved at waste disposal facility through blower and pump optimization
• +8 more outcomes

Named customers12 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Four partnerships are on record, tiered notable, minor and core.

• Ministry of Land, Infrastructure, Transport and Tourism (国土交通省)notableStrategic or Co-development Partner · 1 January 2024Participating in the Ministry of Land, Infrastructure, Transport and Tourism's B-DASH Project (下水道革新的技術実証事業), a government-led initiative for innovative sewer technology demonstration. Estem contributes its SACRA remote monitoring system as a portable, rapidly deployable monitoring solution for disaster recovery scenarios where on-site technical management is difficult.
• Aiichi University (愛知大学) - Forest Cooperation TeamminorStrategic or Co-development PartnerParticipating since 1996 in the Aichi University 'Green Cooperation Team' afforestation activities in the Kubuqi Desert, Inner Mongolia, China. Estem has sent employees annually to participate in tree planting activities, demonstrating commitment to environmental sustainability beyond water treatment.
• Mie University (三重大学) - Chiang Mai AfforestationminorStrategic or Co-development PartnerSince 2006, Estem has annually dispatched employees to the Chiang Mai Midsummer Tree-Planting Festival organized by Mie University Professor Emeritus Umebayashi. Activities in northern Thailand include fruit tree planting and Royal Project site visits.
• SACRA Ecosystem PartnerscoreTechnology or IntegrationSACRA is positioned as a cloud-integrated platform. The website references integration with water treatment facilities, sensors, and monitoring equipment for real-time data collection and remote analysis.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Kubota Corporation: Diversified Japanese industrial conglomerate with a substantial water and environmental infrastructure business including pipes, treatment plants, and pumps. Overlaps with Stem's plant construction and equipment segments as a broad incumbent with deeper capital and broader product portfolio.
• Veolia Environnement: Global water services and environmental solutions incumbent with growing Asia-Pacific presence. Comparable as a comprehensive water/wastewater O&M provider, though at much larger scale and with broader geographic and service scope than Stem.
• Hitachi, Ltd. Diversified Japanese conglomerate with water and environmental infrastructure solutions including IoT-based water management platforms. Comparable as a broad incumbent offering digital water management at scale, with potential to compete on large municipal smart-water projects alongside Stem.
• Xylem Inc. Global water technology company offering smart metering, network management, and treatment solutions with significant digital/SaaS infrastructure. Comparable as a water treatment and monitoring solutions provider, with SACRA-style remote monitoring capabilities that may converge with Stem's offering over time.

Direct peers

• Kurita Water Industries: Japan's largest industrial water treatment company, offering chemicals, equipment, and facility management services to factories and utilities. Directly comparable as a comprehensive Japanese water treatment services provider, though significantly larger and more diversified across chemicals and equipment.
• Organo Corporation: Japanese industrial water and wastewater treatment specialist providing pure water systems, ultrapure water, and wastewater recycling solutions. Directly comparable in serving Japanese industrial customers with treatment operations and consulting, with similar specialist positioning but broader equipment offerings.
• Suido Kiko Co., Ltd. Japanese water treatment engineering and equipment company providing water purification and sewage treatment systems for municipalities. Comparable as a Japanese-focused water infrastructure services and equipment provider serving similar municipal customers.
• Metawater Corporation: Japanese company specializing in design, construction, and O&M of municipal water and sewage treatment plants. Directly comparable to Stem's municipal water/sewer segment, including plant construction and operations support, with stronger public-sector orientation.
• Nomura Micro Science Co., Ltd. Japanese ultrapure water systems specialist serving semiconductor, pharmaceutical, and industrial customers. Comparable in offering water treatment operations support and chemicals to Japanese industrial customers, though focused more on high-purity water than wastewater.
• NJS Co., Ltd. Japanese water and environmental engineering consulting firm providing planning, design, and supervision services for water supply and sewerage projects. Comparable to Stem's consulting and plant construction offerings, particularly in the public-sector/municipal segment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

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 Stem