“Pathogen” is a broad term for an organism that can cause disease. In a property, the useful question is not whether germs exist somewhere, but whether a particular contamination event requires precautions and cleanup.
Situations that change the response
Sewage, floodwater, and blood or other bodily fluids should not be treated as routine household soil. Keep people away from affected areas, avoid direct contact, and seek appropriate help. The material touched and the extent of spread affect what can be cleaned and what may need removal. The CDC's floodwater guidance explains contamination precautions after flooding.
Do not infer health risk from appearance alone
Clean-looking water can have an uncertain source, while a stain may be old and dry. A property assessment concerns materials and cleanup methods; medical concerns belong with a healthcare professional. See sewage backup cleanup and biohazard cleanup for different service situations.
Frequently Asked Questions
Does disinfectant solve every contamination problem?
No. Cleaning, removal of contaminated porous material, and source correction may be necessary before a disinfectant is considered.