- Douglas Engineering
 - Manufacturer of oil skimmers, decanters and other removal equipment for industrial waste water, storm water, and emergency spill response. - Linpro Petroleum Services Limited
- Provides oil companies, environmental consulting firms, and the private sector with a range of contracting services.
 Liquid Cargo Management Limited
- Offers service station decommisioning, contamination clean-up, emergency response, and more.- REL Instrumentation Limited
- Developers of pipeline dynamic and static leak detection systems for the oil, gas, and water industries.
- Rivertrace Engineering Ltd
- Specialists in instrumentation for oil-in-water monitoring.
- Soluble Solutions
- Offers consulting, project work, teaching of customised courses, and laboratory tests to help the petroleum industry to control petroleum fouling.
- United Soil Recycling
- Has developed a treatment technology for soil contaminated with petroleum products.
- Vista Research, Inc.
- Making underground pipeline leak detection systems.
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