Brisbane residents have been told to limit water use after flooding forced the shut down of two processing plants.
Premier Campbell Newman said water coming into the plants at Mt Crosby was four times more turbid than what it was during the 2011 flood event.
He said water was being brought in to Brisbane from the Gold Coast and north of the Sunshine Coast, but that would only supply half the capital's needs.
The water supply problem was likely to last for a few days, until cleaner water being released from Wivenhoe dam reached the processing plants, Mr Newman said.
Until then, residents have been urged to only use water for essential purposes, including drinking, cooking, and bathing.
"The water (coming downstream) is four times muddier than it was in 2011. The effect of that has been to cause the two treatment plans to shut down.
He said at normal levels of consumption, the city went through 450 megalitres per day.
"Right now we can only produce and supply about half that.
"It is serious. We need people to conserve water."
Mr Newman said he was extremely relieved that flooding in Ipswich had been limited, and that Brisbane had been spared.
"It's clear the impact in the city of Ipswich has been minimal," he said.
"I'm not prepared to say no-one has been flooded .. but it is minimal and I'm sure there are many, many people who are thankful for being spared a repeat of 2011."
He said it was a similar story in Brisbane, and the flood peak on Monday, caused by local suburban creek flooding and the high tide, may in fact have been higher than Tuesday's peak.