Irish Water says it could soon be illegal to fill a paddling pool or water your garden during the heatwave.
It says that consultations are taking place with their legal team to impose a so-called ‘hosepipe ban’ after supplies fell again overnight.
The enforcement could come into effect in seven days and people would face fines of up to €125.
Irish water restricted supply in the greater Dublin area overnight, where demand has reached “unsustainable levels” at 600 million litres a day.
People are being urged to have short showers and to avoid watering their garden or washing their car.
Meanwhile, the Department of Agriculture has issued a Red Warning for forest fires which took effect at 9am this morning and is effective until 12pm on Monday.
The high temperatures and drought conditions mean that there is an ”extreme fire risk” in some areas.
Irish Water says pressures have been manually reduced on the Killrossanty Lemybrien Water Supply Scheme in County Waterford.
In addition, the water supply will be shut off overnight for the next week, subject to an ongoing review to allow reservoir to fill.
Irish Water says borehole water levels have dropped at the water treatment plant and cannot keep up with the increased water demand.
To help conserve water customers are also being asked to report any leaks they see on the public network and to repair any private side leaks in
their homes and businesses to help restore water levels in the network.
