Sovereign Water Control Pty Ltd was formed to be a licensed user of SCEM 66 grout invented in 1972 by Johannes H Grobler of Pretoria, Gauteng, Republic of South Africa (RSA). The early applications (until about 1980) were mostly for South African precious metals mines, including Foskor (Phalaborwa), Elandsrand (Carletonville), Leeudoring (Westonaria), Doornkop (Soweto), West Driefontein (Carletonville) and President Brand (Free State).

Starting in 1980, use of SCEM 66 expanded to mines outside RSA to include Kambalda Mines (Western Australia).  Work on shafts at the Monktonhall Colliery (Scotland) in 1988 was the first application of SCEM 66 to a coal mine.
During the 1990s, Sovereign established a base of operations in Australia and expanded application of SCEM 66 to solve a variety of water issues for mining and civil projects.  In 1992, Sovereign Water Control Pty Ltd began operations in Perth.  The company has changed names over time from Sovereign Water Control Pty Ltd, to Hydroseal Pty Ltd, to Sovereign Hydrology Pty Ltd, and finally to Sovereign Hydroseal Pty Ltd, but has maintained Perth as its base of operations since its inception.  For more information on Sovereign Hydroseal, please visit

During the early 90s work continued on mines in RSA, Australia and Tasmania, but Sovereign expanded application of SCEM 66 to civil projects.  The first civil job was completed in 1993 for the Thames Water Board (Dartford Tunnel) in London, England.  That same year, two tunnel sealing jobs were completed in New South Wales (NSW), Australia and an outfall shaft in Cornwall, England.   In addition to numerous mine projects in RSA, Australia and England during the latter 90s, Sovereign applied SCEM 66 to seal a tunnel beneath Port Hedland Harbour, Western Australia (WA) in 1997, and intake hoppers for grain silos in RSA and an outfall tunnel at Stone Cutters Island, Hong Kong in 1998.

During the early to mid-2000s, Sovereign continued application of SCEM 66 to mining and civil projects in RSA and Australia.  In 2003, the tradename for SCEM 66 was changed to NOH2O after modifications to the formulation were made.  In 2008, Sovereign started projects in North America, including sealing of an underground bulkhead for compressed air energy storage (CAES) in Kansas, USA and experimentation with NOH2O in a deep underground potash mine in Saskatchewan, Canada.  These projects provided the impetus to establish a second base of operations (Kansas City, MO).  Sovereign has been operating continuously with partners in the USA and Canada ever since.  Sovereign-Thyssen Joint Venture (STJV) was established in 2012 in Regina, Saskatchewan to support operations in Canada and abroad.  STJV has focused on leak control of diamond, uranium and potash mines in western Canada.  For more information on STJV, please visit

Sovereign-Thyssen Limited Partnership (STLP) was established in 2014 to support operations in the USA.  Currently, STLP is based in New York City, New York because of the large number of tunnel leak mitigation projects that have involved application of NOH2O since 2012.  STLP also supports American salt mines in several states on leak control and shaft sealing programs.  For more information on STLP, please visit

In 2013, Sovereign Jeda JV was established in Singapore to support large underground civil projects including sealing of rail tunnels for the Marina Bay Cruise Centre and passenger terminal, road tunnels for Samsung C&T Corporation, and multiple tunnels for transmission cables.  For more information on Sovereign Jeda JV, please visit

In recent years, Sovereign has formulated grouts that are radiation tolerant.  The goal is to develop a formulation that can be used for construction of groundwater containment structures such as those that may be needed at disaster sites and long-term high level waste storage sites.  We have two formulations (NOH2O and NOH2OR) that are radiation tolerant and are refining the injection methods to suit the variety of geological deposits that may be encountered in the subsurface at nuclear facilities.