Physical Address: Bapsfontein Road, Kaalfontein located to the East of Kempton Park.

The works was built in 1977 and receives effluent from industries in Spartan and Isando and households in the Kempton Park area.

The Hartebeestfontein works differs from the traditional activated sludge works in that it utilises a two-stage, two-culture activated sludge process. Each stage is a complete processing unit comprising of aeration, clarification and sludge return. The primary stage is aimed principally at COD (Chemical Oxygen Demand) removal and the secondary stage for nitrification. The initial comprised of three 10 megalitres per day treatment modules totalling 30 megalitres per day.

In 1986 a side-stream Phostrip (biological phosphate removal) plant was retrofitted. This was followed by the addition of a third inlet works module in 1992 and a single 15 megalitres per day treatment works resulting in a total treatment capacity of 45 megalitres per day. The works was recently refurbished at a cost of R65 million, including the building of a new balancing tank and the increase of reactor volume and aeration capacity.

In 1995 a tertiary treatment system was designed and implemented to handle chemical dosing to ensure an even more effective phosphate removal.

Effluent from the Hartebeestfontein works flows via the Swartspruit to the Rietvlei Dam. Bio-solids are land applied and ploughed in.

Capacity : 45.00 Mℓ/d