Not all water damage needs chemical treatment — a clean water leak often doesn't. But gray and black water contamination require antimicrobial treatment that extraction and drying alone can't provide.
A burst supply line or appliance leak carries no biological contamination — once water is extracted and the area is properly dried, there's typically nothing further to treat chemically. This is one reason Category 1 water damage costs less per square foot than Category 2 or 3.
Sewage or flood water carries bacteria and pathogens that pose a genuine health risk — any materials it contacted (especially porous ones like carpet or drywall) typically require disinfection at minimum, and are often removed and replaced rather than just treated, since some contamination can't be fully eliminated from porous material.
If water sits for more than about 72 hours before extraction and drying begin, mold growth has often already started at a microscopic level — mold prevention treatment ($350–$460) addresses this head start, which is part of why acting within the 24–48 hour window matters so much for keeping total cost down.
Musty odor after water damage usually means moisture is still present somewhere — inside padding, subflooring, or wall cavities — not that the deodorizer failed. Addressing lingering odor usually means finding remaining moisture, not just reapplying more product.
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