The Special Investigating Unit (SIU) is probing tenders worth R474 million issued by the Department of Water and Sanitation.
The investigation will hone in on four IT contracts which were awarded by the department to technology group EOH and its subsidiaries.
The alleged impropriety happened between 2012 and 2017.
The SIU says it will be working closely with the State Capture Inquiry to investigate the matter.
EOH provides technology solutions to the public and private sectors and is one of the largest technology services companies in Africa.
The company has previously been in the spotlight for launching a R6.4 billion civil claim against its former executives implicated in a wide-ranging tender corruption scandal.
[Header image: ID Labs Architects]