Johannesburg Water (JW) said its Hursthill 1 Reservoir is empty and on bypass.
This is the system that supplies water to Albertville Extension 6, Montgomery Park extension 3 and surrounds.
On Monday, the Commando system was still at critically low levels, although some reservoirs have so what improved.
Night closures and throttling in high demand areas continues, as interventions to enhance the recovery of the system.
JW also said warm weather against rising demand, worsen the situation.
JW also said inflow at Crosby Reservoir, Brixton, Tower and Hursthill 2, are satisfactory.