How to tell black mold from the regular kind
Not every dark spot on a wall is toxic. Real Stachybotrys usually:
- Looks dark greenish-black and a little slimy or shiny when wet
- Grows on things that stay damp (drywall, wood, ceiling tile)
- Has a strong musty, earthy smell
- Shows up where there’s a real moisture problem — not just seasonal condensation
Cladosporium, Aspergillus, and Alternaria can look dark too. Only a lab test on a surface or air sample can actually confirm the species. If you’re not sure, don’t poke at it — get it looked at first.
Why people take Stachybotrys seriously
The CDC and EPA note that indoor mold exposure can trigger allergy-like symptoms in some people, and that sensitivity varies — infants, older adults, and anyone with asthma or a compromised immune system may react more strongly. Public agencies say further research is still needed on the specific health effects of Stachybotrys chartarum. None of this is medical advice; if someone in the house has ongoing symptoms, talk to a healthcare provider. If you can see dark growth, the practical next step is testing and, if warranted, removal by a licensed contractor.
Why bleach and store-bought sprays don’t actually work
Bleach might lighten the color on the surface, but the roots go into porous stuff like drywall and wood where bleach can’t reach. Worse, bleach adds moisture — the one thing mold needs to grow. Consumer “mold sprays” are much the same. Real remediation means physically removing the contaminated material and fixing whatever moisture caused it.
How the referral & remediation process works
STEP 01
Assessment & lab testing
Visual walk-through plus swab or air samples sent to an accredited lab.
STEP 02
Full containment
Sealed poly barriers, negative-air machines, and a decon zone before demo starts.
STEP 03
Safe removal
Contaminated porous materials bagged and disposed of per Texas rules.
STEP 04
Clearance testing
Independent air samples confirm spore counts are back where they should be.
Pricing guide
Every home is different — these ranges reflect what TDLR-licensed contractors in our Pasadena-area network typically charge. You’ll always receive a free, itemized written estimate directly from the licensed pro before any work begins.
| Scope | Typical price range | Notes |
|---|---|---|
| Small black mold spot (< 10 sq ft) | $700 – $1,500 | Under-sink, tile grout, small drywall patch |
| Bathroom black mold | $1,800 – $4,000 | Drywall + tile + ventilation fixes |
| Attic Stachybotrys | $3,500 – $8,500 | Rafter treatment and ventilation work |
| Multi-room toxigenic mold | $5,000 – $15,000 | Full IICRC Level 3 protocol |
Insurance may cover mold caused by a sudden covered water loss. Our partner contractors can help with claim documentation.