The Department of Administrative Services confirms to 10 Investigates that it has turned off the drinking water supply for employees at its facility on Surface Road in west Columbus.
Those state employees are now receiving bottled water.
The move is in response to elevated levels of a chemical called trihalomethanes.
Trihalomethanes are the byproduct of disinfectants such as chlorine, according to the United States Environmental Protection website. The EPA sets maximum allowable levels in water.
The contaminated water is part of the Franklin County water distribution system, according to county spokeswoman, Hanna Greer-Brown.
Greer-Brown sent a statement saying the elevated levels were detected during routine testing in April.
Greer -Brown said the county believes the problem resulted from flushing stagnant water in the "warehouse," in which the DAS office is located.
EPA guidelines required the county to notify 3,500 customers in the area, but do not require shutting off the water.
"The levels detected do not impose an immediate health risk," Greer-Brown wrote.
A July email obtained by 10 Investigates from to DAS employees states the department was setting out 5-7 gallon bottles of drinking water throughout the building.
DAS determined that would be "the most prudent course of action," according to an email written by DAS Chief Facilities Officer, Peter Grunnell.
Franklin County will conduct more testing in October, according to Greer-Brown.
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