"The system's back up to normal pressures and working as it was designed to work," says Green Bay Water Utility General Manager Bill Nabak.
A 20 person crew has been working round the clock since the nearly 40-year old, 36-inch pipe burst around 6:30 a.m. Saturday.
"Taking samples, working in the hole here, shutting down valves, isolating the problem as it was," says Nabak.
Katherine Olmsted lives just doen the street and was outside when it happened.
"It was shooting right out that window, my kitchen window," says Olmsted.
Officials say that anyone living east of Bader St. and north of Greenbrier Rd. should boil water until lab results confirm the water supply hasn't been contaminated with sewage or groundwater. Results have to come back clean on two consecutive days to give the all clear. The first clean sample came back Sunday, results from the second should come down early Monday afternoon.
Olmsted has been boiling water for over a day now.
"You just gotta think about it. Like, I just bought some blueberrys and I wanted to wash them off, and if you rinse them off you have to use boiled water, you don't want to use contaminated water from the sink," she says.
Officials say it could be up to a week until East Mason reopens to traffic.
"When we know that the road is safe, and we can get our work done in the hole here and get the hole filled in, we'll get her back in service," says Nabak.
No word on what caused the pipe to break, but Nabak says it was tested just two years ago.
"Still a bit of an art, we are applying as much science as we can, but we'll know more in a month or two I'm sure," says Nabak.
Officials tell WFRV if water samples come back clean Monday, the boil water notice could be lifted as early as Monday afternoon.