WJ Groundwater Limited (WJ) was established in the UK in 1981 as a specialist sub-contractor servicing the needs of the construction and water supply industry. Since its establishment, WJ has opened branch offices in Dubai, Abu Dhabi, and Qatar with further operations throughout the Middle East, Africa, and Europe. WJ has successfully introduced technical innovations for well and pumping systems including:

- Implementation of deep shaft, tunnel, and river-bed dewatering systems
- Use of perimeter well dewatering schemes where others specify internal wells
- Monitoring and alarm systems using data loggers with data accessible via the internet
- Tracer-testing and seawater supply pipelines
- First major ejector dewatering scheme in the UK