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NJS Co., Ltd., originally founded as Nippon Jogesuido Sekkei Co., Ltd. in 1951 and headquartered in Tokyo, Japan, adopted its current name in April 2015. This company, along with its subsidiaries, functions as a prominent construction consulting enterprise, serving clients within Japan and globally. Its primary focus lies in comprehensive services related to water infrastructure and environmental management. NJS undertakes planning, surveying, and supervision for critical systems such as potable and industrial water supply, sewerage networks, river management, and agricultural drainage, alongside wastewater treatment facilities. The firm also offers financial consulting tailored for water and sewage utilities. Beyond engineering design, NJS contributes to infrastructure resilience through seismic assessments and developing disaster prevention strategies, including investigations and countermeasures for inundation and earthquakes. They provide expert advice on water quality management, the maintenance of water and sewage treatment plants and pumping stations, and overall asset management for social infrastructure. Leveraging technology, the company develops various information systems. These include Geographic Information Systems (GIS) for pipelines, rivers, and purified water tanks; facility management systems for treatment plants, pumping stations, and tunnels; Application Service Providers (ASPs); and administrative software for accounting, billing, and collections. NJS's expertise also encompasses the planning, design, and oversight of building projects, including seismic diagnostics for structures. They are involved in the administration of water supply and sewerage projects and offer international consulting services. Additionally, the company conducts environmental impact assessments and basic planning, performs detailed investigations and analyses of rivers, wetlands, lakes, and marine areas for contamination, and carries out general surveying and geological studies.

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