Several households have little to no water as Southern Water faces a fourth day of water supply issues.
Thousands of people across Winchester and wider Hampshire have been affected by the water supply failure.
The supply was cut on Wednesday, leaving people high and dry.
About 13,000 properties were affected earlier this week, and many remain to be so as Southern Water continues to tackle the problem.
Customers have been told to expect an "intermittent" supply of water.
In an update posted to their website, the company said: "Work continued overnight and the system has been cleaned, disinfected, and refilled.
"We are now focussed on water quality testing.
"We operate to the very highest legal and regulatory water quality standards so this is going to take time."
READ MORE: MP calls for urgent parliamentary debate over Southern Water
The company added that it is hoped its Otterbourne site "returns to full operations" late this evening.
As of 9.40am today, Southern Water has been dealing with a burst water main on Winchester Road in Southampton.
This is also contributing to the city-wide water supply issues.
A spokesperson said: "A team has isolated the burst and put a rezone in place.
"Water pressure is returning, however, because of the wider issues at Otterbourne, customers will see intermittent water supply throughout the day."
Three bottled water stations have been provided by Southern Water at the following locations:
- Cantell School - Violet Road, Southampton, SO16 3GJ
- South Winchester Park & Ride - Winchester, SO21 2FG
- IBM Hursley - Hursley Park Rd, Winchester, SO21 2JN
In light of this, Romsey and Southampton North MP Caroline Nokes is calling for an inquiry into the company and for a debate in parliament on their failings.
Speaking to the BBC, she said: "We need to make sure that we have a consistent and reliable supply of clean drinking water into homes across the city of Southampton.
"At the moment we don't, so I think it's perfectly reasonable to describe this as a mess."
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