Swab Testing

Same-day and next-day appointments are usually available across our Altadena service area, with 24/7 emergency response for active leaks, recent water damage, or urgent real estate timelines. Standard scheduling runs 1 to 3 business days depending on availability.

Our certified mold inspectors assess bathrooms, kitchens, laundry rooms, basements, attics, crawl spaces, HVAC components, and any area showing signs of past or current water issues. Thermal imaging and moisture meters identify hidden moisture behind walls and under floors.

Altadena's position at the base of the San Gabriel Mountains creates a moisture environment that is meaningfully different from the flat San Gabriel Valley communities below. The mountains above generate significant stormwater and snowmelt runoff during the rainy season, which flows through alluvial channels and raises the local groundwater table — meaning that Altadena's older raised-foundation homes sit above a more active and higher-volume subsurface moisture source than Pasadena or Arcadia properties at lower elevations. The mountain topography also creates cold air drainage at night that produces fog and dew conditions specific to the foothill zone, maintaining morning moisture on exterior building surfaces that mimics the coastal marine layer effect without being coastal. For properties affected by the 2025 Eaton Fire, the combination of post-fire reconstruction activity, firefighting water exposure to structures, and the community's baseline foothill moisture environment makes comprehensive mold assessment a critical step before reoccupation or renovation.

Pricing varies based on the size of the property, the scope of testing required, and whether any lab work is included. Most residential mold inspections in Altadena fall within the standard industry range of $300 to $600, with a clear quote provided before any work begins.