"We found systemic compensation disparities against women pretty much across the entire workforce," Labor Department regional director Janette Wipper testified in court on Friday, according to a Guardian report.
Google denies it pays women any less than men and challenged the Labor Department to provide evidence to the contrary.
"We vehemently disagree with Ms. Wipper's claim," the company said in a statement. "Every year, we do a comprehensive and robust analysis of pay across genders and we have found no gender pay gap. Other than making an unfounded statement which we heard for the first time in court, the (Labor Department) hasn't provided any data, or shared its methodology."
The Labor Department sued Google in January, seeking access to employee records and pay documentation. Google, for its part, has maintained the government has given no justification for its effort to get the contact information and other records for thousands of employees.
On Tuesday, which was Equal Pay Day, Google tweeted that it had completely closed the gender pay gap globally and also eliminated an race-based pay disparity in the U.S.