CITY officials have pleaded with householders to conserve water after they extended restrictions to 12 hours a day.
Dublin City Council can still not say how long the problems will last but are cutting supplies from 7pm tonight until 7am tomorrow.
They will then review water levels in their reservoirs before deciding whether to continue the limited supply for the rest of the week.
City engineer Michael Phillips said today that they are looking for ways to minimise the inconvenience for businesses and people. He said that extending the restrictions was “the last resort for us”.
However he could not say when a normal supply will be restored.
"When you get prolonged cold weather combined with a problem at the treatment works in Roundwood it meant that too much of that water was being used and production works could not push out enough to meet the demand.
“As a result we had to introduce these restrictions to build up the water in those reservoirs to ensure that we could maintain supply during the day and particularly when people go back to work on Tuesday,” Mr Phillips said.
"What we will do on Tuesday morning is look at how we can minimise the inconvenience for businesses and people. We have to balance with when you are getting up in the morning can you have a shower.”
Nightly restrictions from 10pm to between 7am and 9am were in place over the Easter weekend but an analysis of levels at Stillorgan Reservoir showed little improvement.
The issues are being caused by leakages in the system and an algae which is blocking filters at a reservoir in Roundwood, Co Wicklow.
“A further review of water levels will be conducted again on Tuesday next to determine if Stillorgan Reservoir is back to a sustainable level such that the current restrictions can be lifted,” the council said.
“We strongly urge consumers all over the Dublin region to help conserve water by restricting their use ... during the day as much as possible, especially over the coming days.
“Small adjustments to some of our daily activities can help to significantly reduce the volume of water we use without impacting on our lifestyle.”
In a statement, the council stressed there is no problem with the quality of treated drinking water or with storage levels of untreated water.
They added: “Despite the current restrictions and with some additional capacity gained as a result, water levels still remain below a normal and sustainable level,” the local authority said.
The extended rationing “should assist” in replenishing treated water levels to normal amounts.
The council apologised for the inconvenience.
The rationing affects thousands of householders and businesses.
In some cases, homes have experienced a loss of supply to homes over the Easter period.
Engineers have been monitoring reservoir levels to see if rationing and works to plug leaks have led to improvements.
An algae outbreak at Roundwood water treatment plant is coupled with “unsustainably low” water levels.
Restaurant owners hit out at restrictions over a busy bank holiday weekend.
The Restaurant Association of Ireland (RAI) accused the council of failing to tell the relevant business groups about what was happening.