A Cardiff secondary school and a road will both be shut for several days after a water main burst.
Pupils at Radyr comprehensive have been told to stay home from Monday to Wednesday after Sunday's water leak.
The B4242 Heol Isaf between Radyr at its A4119 junction and Morganstown is likely to remain shut to through traffic for the rest of the week.
Some 14,000 people were left without water, and engineers restored supplies on Monday.
Welsh Water has apologised for the inconvenience.
Cardiff council said the decision to close the school was taken for health and safety reasons and the fact that there are so many contractors working in the area.
Engineers closed Heol Isaf as they worked to restore supplies to customers who have been without water since the fault.
Access will be maintained for residents and emergency vehicles.
A Welsh Water spokesman said: "All our customers should now have had their supplies returned."
He said some customers may experience discolouration for a short period while the system returns to normal.
George Aspros, one of the customers affected, said he noticed a large hole had appeared on his driveway during the night after the water main had burst.
Bottle water has been delivered to some customers on the "at risk" register.
One resident described the water burst as "like an earthquake".
"All the water was flooding down the hill and coming up through the cracks in the road," she added.
If problems persist customers are advised to contact Welsh Water on 0800 052 0130.
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