When water intrusion results from a grossly unsanitary source, the water carries pathogenic (disease causing) agents, or even when clean water has been left to dwell for more than 120 hours. These types of damages can be referred to as Category 3 water losses. This type of damage can affect people with compromised immune systems, or had recent surgery or chemotherapy. When dealing with Category 3 water losses there are many procedures which are necessary for a mitigation company and homeowner to follow in order to restore the property safely. Things such as restore verses replace, personal protective clothing, sanitizers, biocides and proper cleaning techniques including HEPA scrubbing the ambient air. Be sure you choose a restoration company certified in handling these types of water losses.