If you’ve been told you might have a termite problem, one of the first questions a licensed technician will try to answer is which type of termite you’re dealing with. That might sound like a minor detail, but it actually determines everything: the treatment method, the scope of the work, the cost, and how quickly the situation needs to be addressed.
In Southern California, and specifically in cities like Garden Grove and across Orange County, two termite species dominate: drywood termites and subterranean termites. Both are destructive. Both can quietly compromise your home’s structural integrity for years without obvious signs. But they behave very differently, and treating one the wrong way won’t touch the other.
Here’s what separates them and why it matters for your home.
As the name suggests, subterranean termites live underground. Their colony is established in the soil, often several feet below the surface, and can contain hundreds of thousands of individual termites. From that underground base, they build mud tubes that allow them to travel up into the wood of your home without being exposed to open air.
This soil dependency is both their strength and their vulnerability. They need moisture to survive, so they stay connected to the ground. That connection through mud tubes is usually the most visible sign of their presence.
Drywood termites don’t need soil at all. They live entirely inside the wood they’re consuming, which makes them considerably harder to detect. A colony can establish itself in a window frame, a roof rafter, or a piece of wooden furniture and remain invisible until the damage is advanced enough to show on the surface.
Because they don’t require moisture from the soil, drywood termites can survive in drier conditions and at higher elevations within a structure. They’re also the termite most commonly introduced into homes through infested furniture or wooden items brought in from outside.
Subterranean termites enter through ground contact. Any wood that touches or is close to soil, such as door frames, wood siding, deck posts, or structural beams near the foundation, gives them a direct pathway in. They also travel through cracks in concrete slabs, following plumbing penetrations or expansion joints to reach the wood above.
Drywood termites, on the other hand, enter from above. Swarmers fly in through open windows, vents, gaps in the roofline, or any small crack in the exterior of the home. Once inside, they shed their wings, pair up, and start a new colony directly in whatever dry wood they’ve landed in. You might not see them again for months or even years.
If you’re unsure which type you’re dealing with, the safest move is a professional termite inspection. At MEC, our technicians are trained to distinguish between species based on the evidence present and will give you a clear diagnosis before recommending any treatment.
Both species cause serious structural damage, but they tend to attack different parts of a home and in different ways.
Subterranean termites are generally considered the more destructive of the two because of their sheer colony size and their appetite for cellulose. A large subterranean colony can consume significant amounts of wood in a relatively short time. They tend to cause the most damage to ground-level structural elements: floor joists, sill plates, support beams, and anything close to the foundation.
Drywood termites work more slowly because their colonies are typically smaller. But they compensate by being incredibly difficult to detect. By the time the frass or hollow wood becomes noticeable, the damage inside can be extensive. They also tend to target the upper portions of a structure, including attic rafters, roof sheathing, and the wood framing around windows and doors.
In either case, waiting to treat means more wood destroyed and higher repair costs down the line. Catching the infestation early keeps the scope of treatment and restoration manageable.
Because subterranean termites live in the soil, effective treatment requires targeting their underground colony. The most common approach is a soil barrier treatment, which involves applying a liquid termiticide around the perimeter of the home’s foundation. The termites pass through the treated zone and carry the product back to the colony, eventually eliminating it.
In more advanced cases, bait stations may be used to intercept foraging workers before they reach the home. Both approaches require professional application to be effective, as the placement and concentration of the treatment need to account for soil conditions, building layout, and the extent of the infestation.
Drywood termite treatment depends heavily on the size and location of the infestation. Localized colonies that haven’t spread far can often be addressed with spot treatments, which involve injecting termiticide directly into the infested wood through small access holes. This is the least invasive option and works well when the infestation is caught early.
When the infestation has spread throughout multiple areas of the structure, whole-structure fumigation (tenting) becomes necessary. This involves sealing the home under a tent and introducing a gas that penetrates all wood in the structure, reaching colonies that would be impossible to treat any other way. It’s the most thorough option for a widespread drywood infestation and the only method guaranteed to eliminate every colony in the home.
Yes, and it’s more common than most homeowners expect. A home can have an active subterranean colony in the foundation while simultaneously hosting one or more drywood termite colonies in the attic. This is part of why a thorough inspection matters so much. If a technician only identifies one species and treats for that one, the other colony continues undetected.
MEC’s inspection process covers the full structure from foundation to roofline, specifically to avoid this scenario. You can learn more about what our comprehensive termite control service includes and how we handle multi-species infestations.
Garden Grove’s climate sits squarely in the zone where both termite species thrive. The warm, dry summers are ideal for drywood termites to swarm and establish new colonies. The mild winters mean subterranean termites stay active year-round rather than going dormant. The loamy soils common to North Orange County support large underground colonies, and the region’s older housing stock provides decades’ worth of wood that has never been treated.
If your home was built before 1990 and has never had a professional termite inspection, there’s a meaningful chance that some level of termite activity is already present, whether or not you can see the signs yet.
Whether you’ve spotted something that looks like mud tubes, found an unexplained pile of frass, or simply want the peace of mind that comes with knowing your home is clean, MEC Termite & Pest Control is here to help. We’ve been serving Garden Grove and Orange County homeowners for over 27 years, and our inspections are free for residential properties.
Call us at 714-951-4015 or reach out online to schedule your inspection. We’ll identify exactly what species you’re dealing with, explain the best treatment path, and give you an honest, upfront quote with no pressure.