On August 20, 2019 @ 13:23 hrs, Units were dispatch for an Unusual Odor in the Commercial Building at 10459 Courthouse DR. Firerescue was requested to the County Admin building for a odor in the first floor. Odor was determined to be coming from a sewage back up. Crews ran the gas meter through the building with no hazardous readings. Crews set up a PPV fan to ventilate the building and once the fan were setup, E1 returned to service.