Why BC has few termites
Termites are largely tropical and subtropical. Western North America has Eastern subterranean termites (rare in BC), Pacific dampwood termites (limited to coastal forests, occasional structural calls), and Western drywood termites (very rare, mostly southern California). The cool wet BC climate that favours carpenter ants is suboptimal for most termite species. The result is a homeowner perception gap — people see wood damage and assume termites because that's the cultural default, but the actual culprit is almost always carpenter ants.
Visual diagnosis
| Trait | Carpenter ant | Termite |
|---|---|---|
| Body waist | Clearly pinched ('wasp waist') | Broad, no waist |
| Antennae | Bent ('elbowed') | Straight |
| Wing shape (swarmers) | Front wings larger than rear | Both pairs equal length |
| Gallery wall | Smooth, clean | Rough, mud-lined or fecal-marked |
| Wood debris | Frass (sawdust + insect parts) | Mud tubes, fecal pellets |
| Wood consumed | No — tunnels only | Yes — wood is food |
| Visible workers | Yes — large workers easily seen | Workers rarely visible without opening wood |
| Damage rate | Slow — years to significant damage | Can be faster in ideal conditions |
Why diagnosis matters
Treatment differs. Carpenter ants respond to non-repellent gel bait plus moisture management. Termites require subterranean baiting systems, soil treatments, and sometimes structural fumigation — all higher-cost protocols. Treating carpenter ants as termites means significant overspend. Treating termites as carpenter ants means treatment failure. The first step on any wood-damage callout is correct species identification.
Pacific dampwood termite: the BC exception
Zootermopsis angusticollis — the Pacific dampwood termite — is the one termite species with a genuine foothold in coastal BC. It occurs in old-growth forests and occasionally in structural wood with high moisture content (above 19%). Unlike subterranean termites, dampwood termites don't build mud tubes and don't require soil contact. They establish directly in very wet wood — typically wood that has been wet long enough to be starting to decay. If you have highly deteriorated wood in contact with ground moisture (a post buried in soil, a sill plate in chronic contact with standing water), dampwood termite is a possibility. But in standard Metro Vancouver residential structures without soil-contact wood, it's essentially still a carpenter ant call.
The swarmer season overlap
Both carpenter ants and termites produce winged reproductives (alates) that swarm in spring and early summer. In Metro Vancouver, carpenter ant swarms occur April through June. Pacific dampwood termite swarms occur August through October — a later window. If you find winged insects in your home in April-June, they're almost certainly carpenter ant alates. August-October winged insects warrant closer inspection. Either way, the presence of swarmers indoors always means an established colony nearby.
Cost comparison: treating the wrong species
A standard carpenter ant treatment in Metro Vancouver runs $300-600 for a residential property including inspection, bait application, and follow-up. A termite treatment — subterranean baiting system installation — runs $2,500-5,000+. If you proceed with termite treatment on what is actually a carpenter ant infestation, you've significantly overspent, and the ants are still there because the wrong product was applied. Conversely, gel-bait treatment of an actual termite colony produces no improvement. Correct identification saves money and time in both directions.