The outage, from Thai Watsadu Chalong branch to Soi Palai, will be from 9am until works are complete, the PWA said in its announcement.
The water outage is necessary while workers install a 315mm HDPE pipe.
The outage will result in greatly diminished water supply pressure, or no running water at all.
The PWA has also announced a water supply outage in the Cape Panwa area for tomorrow.
The water outage will also be from 9am until the works, the installation of a 255mm HDPE pipe at the Ngao Phad intersection, are completed.
The Ao Yon area and around ‘Thai Sarco hill’ will be affected.
The PWA urged people to hold in reserve 200 litres of water per person to use while the mains water supply outage is in effect.
When water supply resumes, people should be prepared to see discolouration of the water coming out of their taps as the sediment disturbed by the works clears.
The PWA apologised for any inconvenience caused by the outage and said the works would be completed as quickly as possible.
People with enquiries about the outage were advised to call the PWA at 076-319173 or 06-34744565, or the PWA Call Center at 1662.