Contributing to a Stable and Secure Water Supply for Karatsu City's Future: Contract Signed and Design/Construction Commenced for "Kuri No. 1 Water Purification Plant Reconstruction Project"

Suido Kiko Kaisha, Ltd. (Headquarters: Setagaya-ku, Tokyo; Representative Director and President: Toru Furukawa; hereinafter "Suido Kiko"), which develops its main business in the design, construction, and management of water and sewage facilities, as well as environmental conservation and sanitation facilities, announces that it officially signed a contract for the "Kuri No. 1 Water Purification Plant Reconstruction Project" in Karatsu City, Saga Prefecture, in March 2026, and entered the design and construction period in April of the same year.

This project aims to solve issues such as the aging of Karatsu City's core water purification plant, "Kuri No. 1 Water Purification Plant," by constructing a new water purification plant on an adjacent site and transferring its functions. It will be implemented using a "Design-Build (DB) method," which leverages private sector know-how and ingenuity.

In recent years, in the water sector, against the backdrop of aging facilities and a shortage of personnel, the introduction of "Water PPP" (Public-Private Partnership) is progressing, utilizing the technical capabilities of private companies from design to construction, operation, and maintenance. Suido Kiko will enhance its responsiveness to the expected expansion of the Water PPP market by participating in DB method projects that cover design to construction, thereby contributing to the realization of sustainable water infrastructure.

【Background of the Construction】

Karatsu City's core water purification plant, "Kuri No. 1 Water Purification Plant," was completed in 1971. However, a long period of operation has led to significant issues such as aging and insufficient seismic performance. Furthermore, in the future, the Watada Water Purification Plant and Kanda Water Purification Plant, among others, are scheduled to be abolished and integrated into the "Kuri No. 1 Water Purification Plant" system, which will take on an even more critical role as a core water purification plant.

Therefore, with the aim of stably supplying high-quality, safe, and secure water for the future, a plan was devised to construct a new water purification plant on an adjacent site and transfer its functions.

This project has three business concepts: "a water purification plant resilient to natural disasters," "a water purification plant easy to maintain," and "an energy-efficient water purification plant." Suido Kiko will be responsible for the machinery (water treatment plant equipment) sector and will contribute to the construction of a sustainable system that can stably supply high-quality, safe, and secure tap water for the future. Suido Kiko will maximize its water treatment technology and know-how to advance the development of this facility.

【Project Overview】

Client: Karatsu City Waterworks Bureau

Contract Signing: March 2026

Design and Construction Period: April 2026 - March 2032

Project Method: Design-Build (DB) Method

Project Structure: Matsuo Kensetsu Group Specified Construction Joint Venture

Representative Company: Matsuo Kensetsu Co., Ltd. (Civil Engineering)

Constituent Companies: Karatsu Doken Kogyo Co., Ltd. (Architecture), Kishimoto Gumi Co., Ltd. (Civil Engineering), Suido Kiko Kaisha, Ltd. (Machinery), Metawater Co., Ltd. (Electrical), Chuo Sekkei Gijutsu Kenkyusho Co., Ltd. (Design)

【Overview of Kuri No. 1 Water Purification Plant】

Name: Kuri No. 1 Water Purification Plant

Location: 1997-2 Kugi-yama, Kuri, Karatsu City, Saga Prefecture 847-0033 and 8 other parcels

Water Treatment Method: Coagulation-sedimentation + Rapid filtration method (Powdered activated carbon treatment for odor-causing substances will utilize existing facilities)

Water Supply Capacity: 24,000㎥/day

Site Area: 13,097㎡

Scheduled Start of Service: April 1, 2032

【Kuri No. 1 Water Purification Plant Reconstruction and Relocation Project】

Based on Karatsu City's "Karatsu City Waterworks Business Vision" and "Karatsu City Waterworks Facility Development Plan," the aim is to build a sustainable water system. The reconstruction of the water purification plant through this project is an important initiative to realize safe and secure water services through disaster countermeasures and facility renewal.

Due to the aging and insufficient seismic performance of the core water purification plant, "Kuri No. 1 Water Purification Plant" (completed in 1971), it was decided to construct and relocate a new water purification plant with a capacity of 24,000㎥/day on an adjacent site, downsized from the current facility capacity of 33,200㎥/day.

【About Suido Kiko Kaisha, Ltd.】

"With passion connecting people and the earth for 100 years to come, we create an environment full of smiles through technology and products, contributing to society."

Since its founding in 1924, the company has been engaged in water-related businesses, which are indispensable for humanity and the global environment, for approximately 100 years.

Company Name: Suido Kiko Kaisha, Ltd.

Founded: August 1924

Established: January 1936

Capital: 1,947 million JPY

Employees: 918 (as of March 31, 2025, consolidated)

Representative: Toru Furukawa, Representative Director and President

Headquarters: 5-48-16 Sakuragaoka, Setagaya-ku, Tokyo 156-0054

Tel. 03-3426-2131 (Main) Fax. 03-3427-3388

URL https://www.suiki.co.jp