Marlborough Waters chief executive Richard Coningham said water had been trucked into the Awatere area since 8.30am today.
The additional water was helping to maintain supply, but conserving water remained extremely important because of supply constraints, he said.
“Trucking water into the area means we can begin replenishing both the rural Awatere tanks and the Seddon tank while crews continue working on the leak,” Coningham said.
“However, we still need everyone connected to these supplies to use as little water as possible. Please keep water use to essential drinking, cooking and hygiene needs and avoid all non-essential use.”
People in Seddon are advised to boil water as a precaution and those on the rural Awatere supply remain under a long-standing boil-water notice.
Coningham said the precautionary boil-water notice was necessary for Seddon as while the trucked-in water was safe, some of it was food grade and not classed as potable grade under water regulations.
Water should be brought to a rolling boil for at least one minute and allowed to cool naturally before use. The notices will remain in place until the council advises otherwise.
It would continue trucking water into the area as required and was closely monitoring storage levels.
The leak is believed to be in a section of pipe under the Awatere River bed, which could make the repair difficult.
The pipe supplies Seddon, Seaview, Grassmere and rural areas south of the Awatere River.
People are being asked not to water gardens or wash vehicles.