Keshav Chandra, head of Delhi's water board, told the BBC it would take "three to four days" before normal supplies resumed to affected areas.
Jat community protesters demanding more government jobs seized the Munak canal, the city's main water source.
Sixteen people have been killed and hundreds hurt in three days of riots.
Mr Chandra said that prior warnings meant that people had managed to save water, and tankers had been despatched to affected areas of the city, but that this would not be enough to make up for the shortfall.
Schools in the city were also closed after supplies from the canal were sabotaged during the protests.
The army took control of parts of the canal on Monday morning, but repairs are expected to take time.
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