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Contractors must register their Underground Injection Control (UIC) systems with the Department of Environmental Quality (DEQ). This is essential because the DEQ is responsible for protecting the state's water resources. Registration with the DEQ ensures that contractors comply with regulations designed to prevent the contamination of groundwater from pollutants that could be introduced through UIC systems. The DEQ oversees the implementation of safe practices and may require permits or additional documentation to validate the proper functioning and maintenance of these systems.

The other options, while they have important environmental or labor roles, are not the correct authority for registering UIC systems. The Environmental Protection Agency (EPA) is involved in broader federal regulations regarding environmental protection but delegates state-specific implementations to state departments like the DEQ. The Department of Transportation focuses on infrastructure and transport-related regulations, while the Department of Labor deals with employment standards and worker safety, neither of which pertains to UIC system registration. This context highlights why the DEQ is the correct agency in this scenario.