The tap water at Raffles City eateries is safe to drink, said water agency PUB on Monday, after outlets on Sunday noticed their tap water was yellowish and smelled odd.

The shopping mall flushed its water system and installed extra filters on Sunday, and water supply was restored by Sunday evening, its management said.

Eateries on the first and basement levels there had refrained from serving customers tap water as a precaution.

The PUB said water samples from the mall's distribution pipe, water mains and water storage tank were collected on Sunday evening and Monday morning for analysis, and lab tests showed the water was safe.

"PUB will continue to monitor the water quality," a spokesman said.

Preliminary findings by the Raffles City building management and PUB indicated renovation works carried out on Level 1 of the shopping mall could have disturbed sediments in the pipes and caused the discolouration.