Homes and businesses east of the Reversing Falls bridge are now into day three of a boil water order.
Officials say a valve was left open and chlorine gas failed to treat the water for about 15 minutes on Friday morning.
Tests on the system have been and will continue to be conducted as officials look for the green light to allow home-owners and businesses to turn their taps back on.
The Millidgeville area is the one exception where water doesn't have to be boiled. The earliest the order can be lifted is tomorrow afternoon.
