Nihon Suido Consultants

Water Infrastructure Consulting · Shinjuku, Tokyo

Nihon Suido Consultants, established in 1959, provides surveys, diagnosis, planning, design and construction supervision for water infrastructure. Its work covers water supply, sewerage and rivers, including renewal plans for aging facilities and pipelines, seismic assessments of water facilities, consolidation plans for treatment plants and flood-risk evaluation for businesses.

It also supports the management of water and sewerage utilities, including rate revisions and public-private partnerships such as Water PPP, and offers water-use and wastewater solutions for industrial facilities. Its Blitz software series covers GIS pipe registers, equipment registers and real-time flood prediction. The group had 737 consolidated employees as of December 31, 2025.