The core activity of GWK GmbH is the inspection and testing of gas and water installations, including liquefied gas controls and drinking water hygiene. Specifically, this includes: gas and water installation inspection, liquefied gas control (particularly for caravans, ships and catering establishments), drinking water hygiene, and inspection of house installations on behalf of gas and water suppliers. The company thus provides services in the field of safety and environmental monitoring of gas and water systems.