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Published January 28, 2025 · Reviewed August 6, 2026 Stachybotrys is one of many molds that can grow on chronically wet, cellulose-based materials. Color cannot identify a species or tell you how a person will react.
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Several molds can appear dark green, brown, or black, and the same species can look different as conditions change. Visual inspection may establish that growth is present, but laboratory analysis is needed when species identification serves a defined purpose.
CDC guidance does not recommend treating Stachybotrys differently from other indoor mold based on color alone. Any indoor growth points to a moisture condition that should be corrected.
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Gypsum board facing, paper, ceiling tile, wood products, and dust can support growth when they remain wet. Roof and plumbing leaks, flooding, condensation, and high humidity can create those conditions.
The investigation should locate the water source, determine which materials are affected, and assess whether growth extends beyond the visible surface.
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Avoid dry brushing or disturbing a large suspect area. A remediation plan may require containment, removal of porous materials, cleaning of retained surfaces, and correction of the moisture source.
People with health concerns should speak with a qualified healthcare professional. A mold color, species name, or environmental sample cannot predict an individual medical outcome.
Share the type of damage, your city, and anything you can safely observe. SCCS NWI will explain the next practical step.
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