Types of Mold Testing Available in Denver
Air Sampling (Spore Trap)
The most common method. A calibrated pump draws a measured volume of air through a spore trap cassette that captures airborne mold spores. Samples are collected simultaneously indoors and outdoors to establish a baseline ratio — elevated indoor counts relative to the outdoor baseline indicate an interior mold source. Standard Denver protocol: one outdoor baseline + one or two indoor samples.
Best for: General indoor air quality screening, post-remediation clearance verification, real estate transactions, and situations where mold is suspected but not visible.
Surface Sampling (Tape Lift / Swab)
Clear tape pressed against a visible mold colony or discolored surface — or a sterile swab — collects spores and fragments for laboratory microscopy and culture analysis. Identifies specific species present in a visible colony, distinguishes mold from dirt or staining, and quantifies growth severity.
Best for: Identifying whether visible growth is mold (vs. efflorescence or discoloration), determining the specific species for health risk assessment, and targeted sampling of a specific suspected area.
Bulk Sampling
A piece of building material — drywall, insulation, carpet, flooring — is collected and submitted to the laboratory for comprehensive analysis. Used when surface growth has penetrated the material and surface sampling would undercount the actual level of contamination.
Best for: Assessing contamination level inside drywall or insulation after a water event, determining whether materials are salvageable or require removal.
The Colorado Altitude Factor in Mold Testing
Denver's elevation (5,280 ft) affects air sampling in a way that laboratory analysts and Denver-experienced inspectors must account for. Air pumps are calibrated for sea-level air density. At Denver's elevation, air is approximately 17% less dense than at sea level, meaning the same pump draws through a slightly lower actual volume of air per minute. An inspector unfamiliar with Colorado altitude needs to apply a correction factor to calculate accurate spore concentrations. Our vetted inspectors are trained on altitude-corrected sampling protocols.
What Mold Species Are Common in Denver Homes?
- Cladosporium — Most common in Colorado homes. Found on walls, wood, and HVAC systems. Low-to-moderate health risk for most people.
- Penicillium/Aspergillus — Common in Denver basements after moisture events. Produces mycotoxins that can affect respiratory health with prolonged exposure.
- Stachybotrys chartarum (Black Mold) — Found in Denver homes after sustained water events — burst pipes, snowmelt flooding, or ice dam water intrusion. Produces trichothecene mycotoxins. Requires professional remediation.
- Alternaria — Common in Colorado, particularly in bathroom and window areas. Allergy trigger for sensitive individuals.
- Chaetomium — Indicator of chronic water damage. Found in Denver basements with long-term moisture infiltration.
Post-Remediation Clearance Testing
After mold remediation is complete, independent clearance testing confirms that indoor spore counts have returned to acceptable levels and no hidden mold sources remain. This testing should always be performed by a certified industrial hygienist (CIH) who is independent from the remediation contractor — not by the same company that performed the work. Our network coordinates independent CIH clearance for all remediation projects.
Mold Testing Cost in Denver
- Air sampling (per sample, incl. lab): $150–$300
- Standard protocol (outdoor + 2 indoor): $400–$750
- Surface/tape lift (per sample, incl. lab): $75–$150
- Post-remediation clearance (independent CIH): $350–$600
Prices shown are examples only. For an accurate quote for your specific situation, call (720) 964-0332 — free consultation with a specialist.