HRSB Sigma Envirotech Sdn. Bhd. is a joint venture company between HRSB Holdings Sdn. Bhd. and Sigma Water Engineering (M) Sdn. Bhd. based in Puchong, Selangor. Incorporated in 2019, HRSB Sigma Envirotech’s business is centred towards supporting our clients to achieve their sustainable development goals by ensuring responsible freshwater usage and wastewater discharge. With Sigma's more than twenty years of experience in water and wastewater treatment and HRSB's acumen in plant maintenance & turnaround works, HRSB Sigma Envirotech provides the best platform as a reliable solutions provider for your water & wastewater systems.