The federal General Services Administration says three buildings and 150 people were evacuated for three hours Friday morning after a small chemical spill at the Lakewood Federal Center.
Spokesman Ben Gonzales said no one was hurt, and all the buildings have reopened.
He said 30 gallons of hydrogen peroxide spilled at in a water treatment unit.
The Federal Protective Service and West Metro Fire were called.
A private company came in and did the cleanup.
Gonzales said the center itself was not closed at any time.
Some of the agencies in the three buildings decided to give their staff the day off before it became clear that the cleanup would be easily accomplished.