Mold remediation after water damage in Texas: when DIY ends and a pro starts
Texas humidity grows mold fast. After any significant water event — burst pipe, hurricane, flood, ice-storm thaw — the question isn't if mold will grow but how fast you can dry the materials before it does.
The 72-hour clock
Industry standard (IICRC S500) says wet building materials should drop below 16 percent moisture content within 72 hours, or you treat everything in the affected area as contaminated. In Texas, where ambient humidity is 50–80 percent year-round, that means commercial dehumidifiers and air movers are usually required — not box fans.
The fastest, cheapest path through any water event is:
- Stop the source within minutes
- Extract standing water within hours (truck-mounted extraction or wet-vac)
- Dry materials within 72 hours with proper equipment
- Pay attention to wall cavities and under-slab vapor — moisture meters are not optional
What Texas law actually requires
The Texas Department of Licensing and Regulation (TDLR) regulates mold assessors and remediators. Key thresholds:
- Under 25 sq ft contiguous mold growth: homeowner can DIY or hire any qualified contractor; no TDLR license required
- Over 25 sq ft contiguous mold growth: a TDLR-licensed Mold Remediation Contractor must perform the work
- HVAC duct contamination: always requires licensed remediation regardless of size
- A separate Mold Assessment Consultant must develop the protocol and verify clearance for licensed jobs (assessor and remediator must be different companies)
When DIY is fine
- Tiny patch on a bathroom ceiling or grout line, fully accessible, under 10 sq ft
- Surface mold on a hard, non-porous surface (tile, glass, sealed countertop)
- You're not immunocompromised, asthmatic, or allergic
- You wear an N95 (or better) and clean with EPA-registered antifungal — not just bleach (bleach doesn't penetrate porous materials)
When to call a licensed Texas remediator
- Visible growth larger than ~10 sq ft, or you can't tell how far it extends
- Mold inside walls (you popped drywall and found a colony)
- Smell of mold without a visible source — points to hidden growth
- Anyone in the home is immunocompromised, asthmatic, or has chronic respiratory issues
- HVAC system has been running while contamination was present
- You're going to file an insurance claim — licensed remediation with proper documentation is required for most insurer payouts
The remediation process
- Assessment. A TDLR Mold Assessment Consultant inspects, samples, and writes a remediation protocol (work scope and clearance criteria).
- Containment. Affected areas are sealed off with plastic sheeting and negative air pressure (HEPA-filtered exhaust to outside).
- Removal. Contaminated porous materials (drywall, carpet, padding, insulation) are bagged and disposed. Hard surfaces are HEPA-vacuumed and treated.
- Drying. Commercial dehumidifiers and air movers run until moisture content is verified below threshold.
- Clearance. The Mold Assessment Consultant returns to verify air sample counts are normal and the remediation passed.
- Reconstruction. Drywall, flooring, and finishes are restored — usually a separate restoration contractor.
Cost ranges in 2026 Texas
- Tiny DIY-equivalent surface mold: $0 (DIY) – $400 (small pro cleanup)
- Single-room contained job: $1,500–$5,000
- HVAC duct cleaning + small remediation: $4,000–$9,000
- Whole-house flood remediation (Harvey-scale event): $25,000–$60,000+
- Plus restoration / reconstruction: typically equal to or greater than the remediation cost
How to vet a Texas mold company
- Verify TDLR license at tdlr.texas.gov by license number
- Confirm the assessor and remediator are different companies (Texas conflict-of-interest rule)
- Ask for a written remediation protocol before work starts
- Get a written clearance letter at the end
- Confirm IICRC S500/S520 certification on the technicians actually doing the work
