Alternaria

What is Alternaria?

Alternaria is a common allergenic mold that typically grows outdoors but can easily make its way indoors. It thrives in damp environments and is frequently found in areas like showers, under leaking sinks, and places that have suffered extensive water damage.

Health Considerations

Alternaria has been associated with asthma flare-ups and allergic responses in some individuals. Reported symptoms may include sneezing, coughing, watery eyes, and skin irritation. People with pre-existing respiratory conditions may be more sensitive. People with health concerns should consult a qualified healthcare professional. An independent mold assessment can help determine whether this mold is present in your property and document the moisture conditions that support its growth.

Why Visual Identification Is Not Enough

Alternaria often appears dark green or brown with a velvety or woolly texture, but these characteristics are shared by several other molds. Visual identification alone is not reliable. Laboratory analysis of a collected sample is needed to confirm the genus. The most reliable way to determine which species is present — and at what concentration — is through laboratory-verified mold testing. Air and surface samples analyzed by an independent laboratory provide the factual data needed to make informed decisions about next steps. For a broader overview, see our mold knowledge center.

Prevention & Management

To prevent Alternaria, it is important to fix any leaks immediately and keep areas like bathrooms and kitchens well-ventilated. Regularly clean and dry areas prone to dampness. If you have experienced water damage, it is important to dry the area completely within 24-48 hours. Our mold testing services can provide you with a clear roadmap to address these concerns effectively.

Other Common Mold Types

Mold Testing Across Tampa Bay

We provide independent alternaria testing and inspection for property owners throughout the region, including Tampa, Brandon, Wesley Chapel, Riverview, and St. Petersburg. We also provide independent commercial mold assessment for offices, retail, medical facilities, and multifamily properties, and post-remediation verification after a remediation contractor has completed their work.