The Carl Grundlingh WCW is situated north of Nigel and falls within the DD5 drainage district. The works was built in 1977 and upgraded in 1984. It is designed to treat 5 Mℓ/day raw sewage from the Dunnottar, Sharon Park and Marievale areas. Activated sludge is employed as the main treatment process.

A central inlet works, incorporating the processes of screening, grit removal and flow measurement serves the works. The activated sludge process includes anaerobic/anoxic zones followed by an aerated Pasveer ditch reactor and final clarification. The final effluent is chlorinated before re-use and discharging it into the Nigel Dam. The outflow of the dam flows into the Blesbokspruit.