Last Updated: March 2026 | Reviewed by The PCC Research Team
Termites cause an estimated $5 billion in property damage every year, and standard homeowners insurance does not cover it. By the time your foot breaks through a hollow floorboard, the colony has already been eating your equity for years.
California homeowners face a unique challenge: we are heavily infested by both Subterranean Termites (which come up from the soil) and Drywood Termites (which fly into your attic). Finding them early requires a specific set of tools and knowing exactly where—and how—to look. Here is your DIY inspection protocol.
The Inspection Toolkit
- High-Lumen LED Flashlight
- Flathead Screwdriver
- Stepladder
- Safety Glasses & Dust Mask
- Digital Camera / Smartphone
Hunt for Mud Tubes (Subterranean)
Subterranean termites live in the ground. Because they dry out and die if exposed to open air, they build protective “mud tubes” to travel from the dirt to your house framing.
- The Foundation Check: Take your flashlight and walk the exterior of your home. Look closely at the exposed concrete slab beneath your siding. You are looking for brown, pencil-width veins of dried dirt traveling vertically up the concrete.
- The Crawlspace: If you have a raised foundation, shine your light up the concrete piers and wooden support beams under the house.
Do Not Break the Tubes!
If you find a mud tube, your first instinct will be to scrape it off and spray it with bug killer. Stop. If you destroy the tube, the termites will simply panic, retreat underground, and build a new, hidden tunnel somewhere else. Leave the tube completely intact so an exterminator can use it to track and bait the colony using systems like Sentricon or Trelona.
Search for “Frass” (Drywood)
Drywood termites do not need contact with the soil; they extract all the moisture they need directly from the wood they eat. As they tunnel through your roof eaves and window frames, they need to keep their tunnels clean, so they push their feces out of tiny “kick-out” holes.
This feces is called Frass. To the untrained eye, it looks like a small pile of sawdust or coffee grounds accumulating on a window sill, a baseboard, or a spider web in the garage.
How to identify it: Grab a magnifying glass. Real sawdust is splintered and irregular. Termite frass consists of hard, perfectly uniform, 6-sided hexagonal pellets. If you see this, you likely need a localized treatment or structural fumigation.
The “Tap and Prod” Test
Termites eat wood from the inside out, intentionally leaving a paper-thin layer of paint or wood on the surface to protect themselves from the sun. The wood might look perfectly fine to the naked eye.
- The Tap: Take the heavy plastic handle of your flathead screwdriver and firmly tap along your baseboards, window frames, and exposed garage studs. Solid wood will “thud.” Termite-damaged wood will sound distinctively hollow and papery.
- The Prod: If a spot sounds hollow or looks blistered (like water damage under paint), gently press the metal tip of your screwdriver against it. If it easily sinks through the paint into empty space, you have found an active gallery.
Identify Swarmers vs. Flying Ants
On the first warm, sunny day after a California winter rain, mature termite colonies send out winged reproductives (swarmers) to start new colonies. Finding dozens of discarded wings on your patio or indoor window sills is a massive red flag.
Homeowners frequently confuse termite swarmers with harmless flying ants. Here is how to tell them apart:
- Termites: Have a thick, straight waist (like a cigar) and four wings that are all the exact same length. Their antennae are completely straight.
- Flying Ants: Have a pinched, narrow waist (like an hourglass) and their front wings are distinctly longer than their back wings. Their antennae are bent or “elbowed.”
Frequently Asked Questions
Did You Find Signs of Damage?
Do not attempt to treat a structural termite infestation yourself. Your home is your largest financial asset. Connect with a licensed California termite inspector to get a free evaluation and learn your exact treatment options.
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