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Ishikawa Maintenance Co., Ltd. was established in 1973 as the maintenance company of Ishikawa Co., Ltd., a comprehensive manufacturer of filtration units, separation units, and pump equipment, which was founded in 1958.
Ishigaki Maintenance Co., Ltd. was founded in 1958 as a comprehensive manufacturer of filtration and separation equipment and pump systems, and was established in 1973 as the maintenance company of Ishigaki Co., Ltd., a manufacturer.
Founded in 1973.
Established as the Environmental Equipment Division Technical Section of Ishigaki Machinery Co., Ltd. (now Ishigaki Co., Ltd.)
Established by dissolving the same section with a capital of 10 million yen
Osaka Branch Opening
Kyushu Branch and Nagoya Branch Opening
Shikoku Branch, China Branch, Tohoku Branch Opening
Construction Permit (Mechanical Equipment Installation) Ministerial Permit (Special-54) No. 8546
Hokkaido Branch Opening
Sewer Treatment Facility Maintenance Management Registration (Ministerial Registration 62-27)
Capital Increased to 50 million yen
Tokyo Branch Opening
Hokuriku Office Opening (now Hokuriku Branch)
Kagoshima Office Opening
Construction Permit (Water Facility Construction) Ministerial Permit (Special-11) No. 8546
Construction Permit (Pipe Construction) Ministerial Permit (Special-12) No. 8546
ISO 14001 Certification Obtained
Introduction of Defined Contribution Pension (Japanese 401k) System
Established Nagasaki Ishigaki Co., Ltd. in Nagasaki City
Kochi Office Opening
ISO 9001 Certification Obtained
Relocation of Headquarters and Tokyo Branch
ISO 55001 Certification Obtained (Kōtōgawa Office)
50th Anniversary of Founding
Ishigaki Group (Ishigaki Co., Ltd. and Ishigaki Maintenance Co., Ltd.) will exhibit at the 2026 Nagasaki Waterworks Exhibition, held at Dejima Messe Nagasaki from October 21 to 23, 2026. The booth number is 129 in the outdoor area.
Ishigaki Maintenance Co., Ltd. will be closed for the summer holidays from August 13 to August 16, 2026. Inquiries and support services will be unavailable during this period and will resume on August 17. Please use the inquiry form on the website to contact us.
Ishigaki Maintenance Co., Ltd. announced that its Tohoku branch will relocate to a new location on August 17, 2026. The new address is 2-2-11 Tsurugaoka, Miyagino-ku, Sendai-shi, Miyagi Prefecture (Sendai KS Building), and the former address was 2-1-29 Honmachi, Aoba-ku, Sendai-shi, Miyagi Prefecture. The telephone number remains unchanged, while the fax number has changed. We will continue to strive to improve our services.
Ishikawa Maintenance Co., Ltd. conducted a sewer service lecture at Tatsuguchi Central Elementary School in Nomi City, Ishikawa Prefecture. After explaining the sewer system, the lecture included quizzes, experiments, and microorganism observations to teach students about the role of the sewer system. We expressed our gratitude to the fourth graders of Tatsuguchi Central Elementary School.
A three-day internship was held from July 7 to 9, 2026, at the Sakaide Plant and the Koto River Facility. Students from Kagawa Prefectural Takamatsu Technical High School participated and observed and experienced operations such as routine inspections, water quality testing, and central monitoring.
Ishigaki Maintenance Co., Ltd. will exhibit at Sewerage Works Exhibition ’26 Tokyo, held at Tokyo Big Sight from August 4 to 7, 2026. The booth number is 4-101, where the company will introduce its participation and initiatives in WPPP projects in the cities of Osaka-Sayama and Kawachinagano.
Ishigaki Maintenance Co., Ltd. has been selected as a member company of the joint venture “Minami-Osaka Regional Sewerage Services” for Japan’s first joint sewerage Water PPP project involving two cities (Level 3.5), implemented by Osaka-Sayama City and Kawachinagano City. This model project aims to promote regional expansion and collaboration through public-private partnerships, as advocated by the Ministry of Land, Infrastructure, Transport and Tourism, and marks the first time the Ishigaki Group has participated in a Water PPP project. The joint contract signing ceremony was held at Kawachinagano City Hall on February 19, marking an important milestone ahead of the project’s launch.
Our company participated in the Kagawa Marugame International Half Marathon, held on February 1, 2026. The day before the race, members gathered from offices across Japan and deepened connections across locations at a pre-race gathering. The company says it will continue to value initiatives that foster interaction among employees and promote health.
We would like to express our sincere gratitude for your continued support throughout 2025. Our company will be closed for the year-end and New Year holiday from Saturday, December 27 to Sunday, January 4. During this period, we will not handle inquiries or support services. Please use our website's inquiry form for any questions.
A two-day internship was held on November 6 and 7, 2025, at the Kagoshima Sales Office and the Kogashira Wastewater Treatment Plant. Students from Kagoshima Technical High School participated and experienced and observed tasks such as routine inspections and water quality testing.