One homeowner discovered that mushrooms found along their basement floor can be a warning sign of hidden water intrusion, not just a routine maintenance annoyance.
Here's what to know
A post shared in the r/homeowners subreddit said the user noticed mushrooms near a baseboard after moving an electrical panel cover that had been sitting on the floor for months. They added that they spend "9-10 hours there daily" because it doubles as a home office.
"I really think this is because of that piece of wood that was left there when I needed access to the panel last time," the poster wrote.
One commenter responded, "There is 100000% a moisture source, you can't grow mushrooms (fungus) without it. There is no other option here. If it's a leaky pipe, a cracked basement wall, water coming through the slab, or drainage backup, it's been wet enough for long enough to grow mushrooms"
One reply said, "You're gonna rip that wall out now," while another added, "You're also gonna pull the carpet."
More background
According to the homeowner, the basement seemed dry, was fully finished, and already had a dehumidifier running.
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But as the commenters pointed out, visible fungal growth can be a major red flag that moisture has been present longer than residents realized.
Even if the air in a basement feels dry, water can remain trapped behind baseboards, under carpet padding, along the edge of a slab, or inside a wall cavity.
Hidden dampness can damage drywall, trim, flooring, and framing, while musty indoor conditions can make a frequently used room less healthy and less comfortable to spend time in.
What can be done?
"Time to get a dehumidifier (industrial) and run it 24x7 while you rip out that carpet and hope you find the source of moisture at that point. If not, you need to start ripping walls til you find the moisture. this will not be cheap." one commenter wrote.
Other users pointed to several possible causes, including plumbing leaks, a cracked basement wall, moisture rising through the slab, or drainage issues outside the home. If the source is not obvious, opening the wall or calling in a remediation, waterproofing, or plumbing professional may be the safest next step.
Because the growth appeared near an electrical panel, homeowners should also use caution before tearing into materials around wiring.
Acting early can help limit damage, protect indoor air, and prevent even more flooring and drywall from ending up in the trash.
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