Williams Industrial Services Group Inc. delivers a comprehensive suite of construction, maintenance, and support solutions to clients in the energy, power, and broader industrial sectors across the United States and Canada. The company's core offerings include extending the operational lifespan of various facilities—such as nuclear, paper, chemical, fossil fuel, industrial gas, hydropower, natural gas, and municipal water and wastewater plants—through ongoing maintenance, modifications, and significant capital project repairs. Their expertise also encompasses specialized services like surface treatment, which involves cleaning, preparation, coatings application, quality assurance, and inspection for nuclear and fossil fuel power plants, industrial sites, and petrochemical facilities.