The £45m turnover Glasgow-based family business employs a team of 365 mechanical, electrical, and civil engineering staff.
The business, which was established in 1986, has recently developed a renewables capability to support its own and its clients net zero ambitions.
WGM’s client base includes Scottish Water, bp Pulse, Scottish Gas Networks and Arnold Clark. Recent projects include a £20m capital upgrade of Dalmarnock Wastewater Treatment Works and, with partners bp Pulse, the delivery of the EV infrastructure for Police Scotland.
WGM managing director Ian Mathieson said: “We are absolutely delighted to be joining the RSK Group with its wealth of engineering talent.
“RSK, with companies such as Binnies and MWH Treatment, has become a real powerhouse in the water sector.”
RSK is now comprised of more than 175 companies, employing 10,000 people.
The group’s annual turnover at the end of this year is expected to be in excess of £800m, more than double the previous year.