There is no word yet on when Waikouaiti tap water will be declared safe to drink.
The Dunedin City Council had hoped to lift the do-not-drink notice at the end of last month, but discussions between local government and health officials have continued.
The council now expected to make an announcement within two weeks, a spokesman said.
Officials had been working closely with Public Health South and all parties needed to be confident the drinking water supply was safe before the notice could be lifted, he said.
Residents of Waikouaiti, Karitane and Hawksbury have been advised to neither drink from the supply, nor use it for food preparation, since February 2 after intermittent spikes in lead levels.
The council has been unable to confirm the cause of all the spikes, but removed a likely source of lead by replacing old pipes in Waikouaiti. Cast-iron water pipes with lead joins were replaced by polyethylene.
A lead monitor was also imported from Belgium and it would enable water to be tested every 20 minutes.
A conductivity monitor and pH meter were installed at the Waikouaiti reservoir and the equipment was expected to provide real-time information about changes in water chemistry, potentially enabling lead to be detected more quickly.
Water testing in recent months has shown tiny amounts of lead at levels considered safe or the heavy metal had been undetectable.
The council has sampled some parts of the network daily and others weekly.
Blood testing of residents did not show they had suffered from chronic long-term exposure to lead through the water supply.
