Residents have also highlighted that tap water in the area appears to be dirty.
In a statement issued by Irish Water, they said:
"Following on from a burst trunk main that occurred on Cathedral Road yesterday afternoon, water supply should now have returned to most customers on the northside of Cork City."
"We are aware that some smaller geographical areas on higher ground may still be impacted, such as Parklands, Killeens Place and Rathpeacon Road, as well as higher parts of Glenthorn and Mervue.
"Irish Water and Cork City Council are working to restore water to all areas impacted as quickly as possible.
"If Customers are experiencing water outages or low pressure, please contact our Customer Care Team on 1850 278 278 and our teams will investigate."
Cathedral Road remains closed off today as repair crews are on site to rectify the burst trunk main:
"The repair crew is focusing on making the area where the burst occurred safe and protecting other services, to ensure the repair can be completed safely."
One such area that is still without water is St. Aidan's Community College on Dublin Hill.
Parents were issued with a text notifying them that the school would close at 1pm today as water had not yet been restored.
Sinn Féin Councillor Thomas Gould earlier took to Twitter to state that it could be 10pm tonight by the time impacted areas have their water restored.
Meanwhile, it was business as usual for most traders on Watercourse Road.
The street experienced some flooding yesterday as a result of the burst water main.
Speaking toJanice McCarthy, the owner of Be Fabulous Hair Design said she was forced to close early yesterday.
"Luckily we have our own water supply in the salon so that wouldn't have been an issue but customers were experiencing difficulty getting to us.
"The sockets in the building are all down low as well, so that was a concern as the water was coming in.
"We had to try and move everything away from the door."
Razors Barbers on Gerald Griffin Street were also open today after yesterday's incident, but mentioned that the premises needed to be thoroughly cleaned after the residue from the flood.
Approximately 20,000 homes and premises on the northside of Cork City were impacted by the burst main.
Irish Water has stated that "this is a complex repair due to the location of the burst."