Termite droppings: what frass is, and what finding it rules out
The termites that wreck Australian homes almost never leave droppings you can find. So a neat pile of pellets on the floor is telling you something specific. Just not what most people assume.
What are termite droppings?
Termite droppings (frass) are the digested timber a termite passes after eating it. What happens to that frass next depends entirely on which kind of termite produced it, and that difference is the whole reason this page is useful.
Subterranean termites, the group responsible for nearly all structural damage in Australian houses, do not leave droppings lying around. They need moisture and they build with what they have. So their faecal material is mixed with soil and saliva and becomes construction material: the mud tubes they travel through and the packed lining of their galleries inside the timber. It is not waste to them. It is the wall.
So if you are searching for termite droppings because you suspect subterranean termites, the honest answer is that you are looking for the wrong sign. The evidence for that group is mud: mud tubes on a pier, mud packed into damaged timber, mud in a crack in a slab.
Then whose pellets are these?
Loose, dry pellets that accumulate in a small pile, usually directly below a piece of timber and often reappearing after you clear them, are characteristic of drywood termites. This group lives entirely inside the timber with no soil contact, does not need the moisture. And has nowhere to store waste: so it pushes the pellets out through a small opening, sometimes called a kick-out hole, and they drop.
Drywood termite pellets are distinctive once you have seen them: hard, roughly the size of coarse sand or ground pepper. And elongated with flattened or concave sides rather than round. Colour varies with the timber eaten, so colour tells you very little.
The other common source of a powder pile is a wood-boring beetle. A borer. Borer frass is finer, closer to flour or talc than to sand, and it comes from clean round exit holes rather than an irregular opening. Borers and fungal decay goes through that group properly.
Reading a pile of debris
| What you found | Where it comes from | What it suggests |
|---|---|---|
| Mud packed into damaged timber, or a mud tube | Subterranean termites | The group that causes structural damage. No loose droppings to find |
| Hard, sand-like pellets with flattened sides, in a pile that returns | Drywood termites | Timber-borne, often localised, but confirms live activity somewhere above |
| Fine, flour-like powder from clean round holes | Wood-boring beetle | A borer, not a termite: different treatment entirely |
| Coarse shavings or fibrous scraps, no galleries | Usually mechanical: drilling, nesting bees or wasps, rodents | Often not a timber pest at all |
Why we will not identify it from a photograph
Sorting pellets into a group is worth doing because it changes what happens next. Naming a species from a pile of frass, or from a photo of one, is not. That identification is made from soldiers under magnification, and getting it wrong changes the treatment that gets applied. This site orients you to the group and hands you over there.
It also matters that drywood termites are not evenly distributed around Australia, and that some introduced species are of particular concern to state biosecurity authorities. That is a question for your state's agriculture or biosecurity department, and another reason not to destroy the evidence before anyone has looked at it.
What not to do with it
Three instincts, all wrong:
- Do not vacuum or sweep it up until someone has seen it. The pile is the sample. An inspector reads the pellets, the rate they accumulate and the opening they came from; clean it away and all three are gone.
- Do not spray it, or spray into the hole. A supermarket insecticide does not reach a colony inside timber, and it does the one thing you cannot undo: it disturbs the insects into abandoning that gallery and working somewhere concealed. Why spraying termites yourself makes it worse sets out what that costs you in treatment options later.
- Do not seal the hole with filler to see whether it reopens. You will lose the only visible access point, and a sealed hole does not stop anything inside.
What to do instead
Photograph the pile with something for scale and note the date. If you want to know whether it is still active, put a sheet of paper underneath rather than clearing it. That way you can see what falls without touching the timber. Then get a timber pest inspection. Frass is one of the few termite signs that is unambiguous about live activity, which makes it a good reason to bring the inspection forward rather than wait for the next annual one.
Frequently asked questions
I found droppings. Does that mean the termites are still active?
A pile that reappears after you clear a small area is a strong indication of current activity, because the pellets are being pushed out now. A single old pile that never returns is less clear. Either way the useful step is an inspection, not a second experiment.
Why can I not find any droppings if I have termites?
Because the group that damages most Australian houses recycles its faeces into mud tubes and gallery lining rather than discarding it. Absence of droppings does not mean absence of termites, and searching for them is not a way to rule termites out.
Are termite droppings dangerous to have in the house?
The pellets themselves are digested timber. The reason to act is what they indicate about live insects in the structure, not the debris on the floor. Questions about dust or allergy belong with a health professional, not a pest site.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- Department of Health, Victoria. Pest control — termites
- Queensland Building and Construction Commission. Protect against termites — termite management systems and inspections