Question one: how long was it wet?
Carpet that dried within 24 to 48 hours has a far better chance than carpet that stayed damp for a week. Time is the biggest factor in how deep growth can reach.
Question two: what kind of water?
Clean supply line water is the best case. Water from flooding, sewer backups, or toilet overflows generally means carpet and pad should be discarded because of contamination, separate from any mold concern.
Question three: how deep is the growth?
Light surface mildew caught early may be cleanable. Growth on the backing or in the pad is much harder to deal with. The EPA notes that porous materials with mold growth may need to be removed and discarded, because mold can grow into spaces that cleaning cannot reach.
Question four: is the source fixed?
Cleaning or replacing carpet before the moisture source is fixed leads to the same problem again. This question applies to both choices.
Weighing value
A valuable rug may justify specialist cleaning attempts. Inexpensive installed carpet with pad growth is rarely worth the effort and risk of keeping.
Pad is almost always replaced when it has growth, even when carpet can be kept.
Get a second opinion by phone
Call (855) 661 4275 during business hours to describe your carpet, the water event, and what you see. That conversation can help you decide on next steps.
This guide is general information about carpet mold based on publicly available EPA guidance. It is not a substitute for an assessment of your property or medical advice.