Waltham has issued another water quality notice, which is connected to a previous issue, according to city officials.
There is no threat to public health, according to City Engineer Stephen Casazza.
The water issue dates back to a similar notice issued in September, according to Casazza.
Recent tests conducted on the city's water detected coliform bacteria, which can indicate the presence of other pathogens, according to the notice. Specifically, the 6.5 percent of the samples showed coliform, in violation of water quality standards that call for less than 5 percent, according to the notice. As a result, the city traced the source of the issue back to pipes near Autodesk in the area of Smith Street and Trapelo Road, Casazza said.
However, further investigation has revealed the source of the problem was low amounts of chlorine in the two water tank at Prospect Hill, he said.
Now, city officials are taking steps to resolve the chlorine issues, Casazza said.