We base sewage clearance on the presence or absence of E. coli and Coliforms. This bacterium should not be present after the mess is cleaned up.
A chemical is added to a big Q-tip that is used to swab the floor. An area one square foot is swabbed.
The swabs are cultured in a lab for 24 hours. Then your samples are read by a microbiologist, who sends us a lab report of the findings. At that point, we can tell you whether your area is ready or not for re-occupancy.
Do not enter the area before you have received the lab results.
Do not remove the containment or any other barriers until the area is ready for re-occupancy.