Wellingtonians have been given the all-clear to go back into the water after sewage leaked into the harbour earlier this week.

After two days of clear samples from water-quality tests in the Whairepo-Frank Kitts Lagoon, Wellington City Council will take its warning signs down today.

A council spokesman said the spill was the result of a break in a wastewater main on nearby Victoria St on Wednesday, which was repaired that evening.

Diluted sewage was let into the harbour through storm water system to ease pressure on the main.

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The latest tests indicated that any effects following the spill had receded.