Ames Crosta Company -
Founded and later acquired by Biwater Services, Ltd.
T. Hawksley established practice in England -
Thomas Hawksley, one of the greatest 19th century water engineers – In his lifetime, he achieved international recognition for developing the first pressurized clean water supply available at the turn of a tap. This system saved countless lives when cholera struck Great Britain in 1848–9 and is one of the reasons the country’s health and prosperity accelerated ahead of many others in the following decades.
T&C Hawksley -
International engineering partnership established.
Dodd & Dodd -
Public health engineering firm set up in UK.
Harza Engineering -
Energy and environmental engineering established.
JD & DM Watson -
Partnership formed for municipal wastewater treatment.
James M. Montgomery (JMM) -
Environmental engineering consultancy firm specializing in water and wastewater established in California. Began construction management services.
Watson Hawksley, Ltd. -
Joined to provide international environmental engineering consultancy.
Montgomery Watson -
JMM merged with Watson Hawksley to become the global firm of Montgomery Watson.
MWH Constructors established -
Starting from zero in the early 1990s, Constructors grew from US $1.5 million in 1994 to revenues of over US $200 million in just 10 years.
Began Design-Build public utility work
Montgomery Watson Harza -
Montgomery Watson merged with Harza to create global energy, utility, and environmental engineering company.
Montgomery Watson Harza became known as MWH and, eventually, MWH Global.
Biwater Services Ltd -
MWH Constructors acquires UK water construction and engineering firm Biwater Services Ltd.
MWH Constructors acquires Slayden Construction Group.
MWH Constructors -
Stantec acquires MWH Constructors as part of MWH Global.
MWH Constructors -
In 2018, MWH senior management lead a management buy-out from Stantec, supported by Oaktree-GFI Energy, MWH Constructors, MWH Treatment (UK) and Slayden, all of which are now privately held with a stronger balance sheet and a bonding capacity in excess of $1 billion.