The Aberdeen Public Works Department is urging people living in the northern part of the city to boil their water; after a sample came up positive for E-coli Wednesday morning.
The affected area runs from North Washington Street to North High Street and from Fourth Avenue Northeast to 12th Avenue Northeast.
The contaminated water is affecting thousands in the hub city.
Public works routinely sends samples to the state health lab for testing, after one of their samples turned up positive; they're now telling everyone to boil their water before drinking it.
Jelby Dunker runs a daycare out of her home, she says today's news of E-coli in their drinking water was a complete shock.
"It just bothers me we didn't hear about it until late this afternoon," Dunker said.
She says after she found out it was already too late.
Dunker says she and her husband used water Wednesday morning to make coffee and again in the afternoon to make food for the children in her daycare.
"We had macaroni and cheese though today and I used water because we didn't know about it," Dunker said. "So I hope nobody gets sick from it."
According to public works director Robin Bobzien, a full investigation into what might have caused the E-coli is underway.
"There's a multitude of reasons why it could fail, we are investigating right now, trying to figure out what may have caused this," Bobzien said.
For people like Dunker who live and work in the area, they're just hoping that after drinking the contaminated water that they will be ok.
E-coli can cause diarrhea, nausea, cramps and headaches.
Bobzien says that as of right now no illnesses have been reported.
His department is in the process of flushing the system and adding more chlorine to the water to prevent contamination.