Mold is a hidden threat in Central Texas homes, especially after periods of high humidity or unresolved water damage. Our regional humidity regularly sits above 60% — the threshold where mold growth becomes sustained, not just possible. Knowing the warning signs helps you address the problem before it becomes a health hazard or causes significant structural damage.
Sign 1: Persistent musty odors. If you notice a musty, earthy smell that doesn't go away with cleaning, mold may be growing behind walls, under flooring, or in your HVAC system. This is particularly common in older homes in Waco, Temple, and Killeen where original ductwork dates from the 1970s–80s. If the smell is strongest when you first turn on the AC after it's been off, you almost certainly have mold in the HVAC return cavity or evaporator coil.
Sign 2: Visible discoloration. Look for dark spots, staining, or discoloration on walls, ceilings, and around windows. Mold can appear black, green, white, gray, or even orange and pink. Don't assume small patches are harmless — they often indicate a larger hidden colony behind the drywall. A visible 6-inch patch of black mold on your bathroom wall typically means 3–10 square feet of hidden growth on the back side.
Sign 3: Health symptoms that improve when you leave home. Unexplained allergies, respiratory issues, headaches, or skin irritation that resolve when you travel or spend extended time away point strongly to an indoor environmental issue — most commonly mold. Children, elderly individuals, and those with compromised immune systems are especially vulnerable. Mycotoxin-producing molds like Stachybotrys chartarum cause more severe neurological and respiratory symptoms.
Sign 4: Recent water damage. If your home has experienced water intrusion — from a burst pipe, roof leak, flooding, or even a dishwasher leak — mold can begin growing within 24–48 hours. Even if the area appears dry on the surface, moisture trapped in walls, subfloors, and insulation fuels growth you won't see for weeks or months. This is why professional drying after water damage matters — a mold claim three months later may be denied if the carrier decides it was preventable.
Sign 5: Visible moisture or condensation. Persistent condensation on windows, high indoor humidity, or visible moisture around plumbing fixtures means you have an active moisture source feeding potential mold growth. Fix the moisture source first, then address any mold.
When DIY is OK: Surface mildew on shower tile and grout. Small mold spots (under 10 square feet) on non-porous surfaces like glass, metal, or hard plastic.
When you need a pro: Everything else. Mold on drywall, wood, insulation, carpet. Mold after water damage. Mold in HVAC. Musty smell without visible source. Black mold. Anyone in the household experiencing symptoms.
A recent case: a Killeen homeowner selling their house had mold discovered during pre-sale inspection. Closing was 10 days out. We did IICRC S520 containment, source removal, and third-party clearance testing in 5 days. Closing held. Buyer and seller happy.
Moisture Pro offers professional mold inspections and IICRC-certified S520 remediation throughout Central Texas. Typical residential remediation runs $1,500–$12,000. Most is covered by insurance when resulting from a covered water damage event. Call (254) 248-7776.