Hawaii regional guide

Termites in Hawaii: Types, Warning Signs, and What to Do

Short Answer

Hawaii has a distinctive termite fauna: eight established species, all introduced. Its defining problem is subterranean termites, led by the invasive Formosan subterranean termite — locally called the “ground termite” — which CTAHR describes as the single most damaging insect pest to homes and structures in Hawaii. A second major subterranean pest, the Asian subterranean termite, is now established on Oʻahu.

Drywood termites are the other main structural group, led by the West Indian drywood termite. A few tree-dwelling and dampwood species round out the eight. Match the evidence to the termite route below, then use our termite treatment decision guide.

Eight species, all introducedHawaii’s termite fauna doubled from four to eight since the early 1990s; every species arrived from elsewhere.

Two Coptotermes togetherHawaii hosts two of the world’s most economically important termite pests side by side: Formosan and Asian.

Hawaii has its own rulesTwo agencies: DCCA licenses pest control operators; the Dept of Agriculture and Biosecurity certifies applicators.

The Termites You May Meet in Hawaii

Scroll the table sideways to see every column.

Group	Hawaii relevance	Strongest clues	Usual next route
Formosan subterranean	The headline pest, locally called the “ground termite”; CTAHR calls it the single most damaging structural insect pest in Hawaii; colonies live in soil and can build carton nests in structures	Mud tubes, dusk swarmers around lights (peak May), carton material in voids, damaged wood that may contain soil	Prompt licensed inspection and a subterranean-control plan designed for colony scale, access, and structure
Asian subterranean	A second major subterranean pest, established on Oʻahu; can potentially hybridize with the Formosan termite	Subterranean signs plus spring-to-summer dusk swarms; soldiers can help a trained identifier	Prompt professional identification; the same soil/bait-based subterranean route, planned for the confirmed species
Drywood	West Indian drywood is the most damaging drywood pest worldwide and long established here; the Western and Indo-Malaysian drywood termites are more recent invaders	Hard fecal pellets, kick-out holes, shed wings, or galleries inside dry wood without mud tubes	Thorough inspection; localized removal or treatment when truly limited, or structural fumigation when widespread or inaccessible
Dampwood & tree termites	The Pacific dampwood termite can infest structural wood but is documented in limited areas; tree termites mostly live in dead wood on living trees and only occasionally enter buildings	Wet or decayed wood; larger or clumped pellets; activity centered on damp or dead wood rather than dry framing	Correct moisture and have damaged wood assessed; confirm the species before assuming a structural infestation

This table routes an inspection; it does not confirm a species. Compare the broad groups in subterranean vs. drywood vs. dampwood termites.

Why Hawaii Is a High-Pressure Termite State

Hawaii’s warm, humid, tropical climate is ideal for termites, and its island biosecurity story is unusual: the termite fauna doubled from four to eight species since the early 1990s, and every one of the eight is introduced. A 2017 UH-authored study reported that termite control and repair cost Hawaii residents over $100 million annually. Regional differences are most useful for understanding which termites occur where, not for declaring any address termite-free.

OʻahuThe island with the most detailed published structural-termite data, including records of the Formosan termite and the more recently established Asian subterranean termite. Much of Hawaii’s distribution and flight research comes from Oʻahu.

Subterranean statewideThe Formosan subterranean termite has spread to the other major islands and is Hawaii’s baseline structural concern. Native subterranean species do not occur here — all of Hawaii’s termites are introduced.

Drywood riskWest Indian drywood termites are long established, and drywood infestations can travel in furniture and moved wood, so risk is not set by soil or yard conditions alone.

Elevation and moistureClimate, rainfall, and elevation shape which termites occur where. The Pacific dampwood termite, for example, is documented at higher elevations on Maui.

Because detailed distribution data is concentrated on Oʻahu, this guide does not rank islands by termite pressure. A transported item such as infested furniture or lumber can also create a local finding without proving that the same termite is established across the surrounding area.

Earthen subterranean termite mud tube running up a concrete foundation — **Mud tubes:** a strong subterranean clue, although an old tube does not prove current activity. Photo: Michael K. Oliver / iNaturalist, CC BY 4.0. Resized and cropped for display by TermitePlan.

Asian subterranean termite winged swarmer resting on a green leaf — **Asian subterranean swarmer:** a second major subterranean pest now established on Oʻahu. Photo: Francisco Farriols Sarabia / iNaturalist, CC BY 4.0. Resized and cropped for display by TermitePlan.

West Indian drywood termites, pale workers with darker individuals, shown close up — **West Indian drywood:** the most damaging drywood termite pest worldwide, long established in Hawaii. Photo: Davidmoradelpozo / Wikimedia Commons, CC BY-SA 3.0. Resized and cropped for display by TermitePlan.

Warning Signs and What They Can Tell You

Mud tubes

Soil-colored tubes on foundations, piers, masonry, plumbing penetrations, or framing strongly support a subterranean route, which in Hawaii most often means the Formosan or Asian subterranean termite. Tubes can remain after activity stops, so learn how to compare termite mud tubes vs. old damage.

Hard pellets or frass

Drywood termites push small, hard pellets through openings in infested wood. Look-alikes include carpenter-ant debris, powderpost-beetle frass, and ordinary sawdust. Compare them in our termite droppings vs. frass guide.

Swarmers and discarded wings

Repeated indoor swarmers or piles of wings near the same window, door, vent, or light deserve inspection. Because Formosan swarmers fly at dusk and are drawn to lights, outdoor swarmers confirm termites nearby but do not automatically prove that a colony is inside the home.

Soft, hollow, or damaged wood

Subterranean galleries may contain soil, while drywood galleries can remain hidden inside wood that looks intact. Damp or decayed wood raises a moisture-and-dampwood question. Visible evidence cannot establish the full hidden extent or structural safety.

Pacific dampwood termite winged swarmer with long brown wings on a gray surface — **Pacific dampwood termite:** one of Hawaii’s eight species; it can infest structural wood but is documented in limited areas. Photo: Judy Gallagher / Wikimedia Commons, CC BY 2.0. Resized and cropped for display by TermitePlan.

When Do Termites Swarm in Hawaii?

Hawaii’s warm, humid evenings drive termite flights, and the most useful pattern is the Formosan peak in spring. Timing can help orient an inspection, but weather, location, and indoor conditions all shift the calendar.

Peak in MayOn Oʻahu, Formosan subterranean termite swarming peaks in May. Flights are favored on warm, humid, calm evenings and are heavier with rainfall and lighter with wind; swarmers fly at dusk and are attracted to lights.

Spring-summerAsian subterranean termite flights on Oʻahu have been recorded around April, June, and July, overlapping and extending the subterranean swarm season.

Timing and time of day support an identification; they do not prove one. This flight data is Oʻahu-based, and the verified sources do not establish a dependable Hawaii drywood swarm month, so one is not printed here.

Why Formosan and Asian Termites Need Faster Assessment

The Formosan and Asian subterranean termites are invasive Coptotermes species, and Hawaii is unusual in hosting both. CTAHR calls the Formosan termite the single most damaging insect pest to homes and structures in the state. They follow the subterranean-control route, but their risk profile is different from an ordinary one-point household clue: colonies can be very large, and they can build moisture-holding carton material in structural voids.

That does not mean every evening swarm is a Coptotermes or that every sighting signals immediate structural failure. It means an indoor swarm, active tubes, carton material, or widespread hidden damage should move the case toward an experienced licensed inspection. Read the dedicated Formosan termite guide for the identification limits and professional threshold.

Get a Licensed Inspection Promptly If

live termites, repeated indoor swarmers, or recurring piles of wings are present;
mud tubes enter framing, flooring, walls, or another structural area;
hard pellets return after careful cleanup;
wood is soft, sagging, extensively damaged, or potentially structural;
subterranean signs appear and Formosan or Asian termites are plausible;
a property transaction, structural fumigation, or a termite inspection report is involved;
you cannot confidently separate termites from ants or another wood pest.

Photos and observation tools can improve triage, but they cannot establish colony location, current activity, hidden extent, or structural capacity.

Treatment Paths Depend on the Termite Type

Subterranean (Formosan & Asian)

Professional liquid soil treatments and monitored bait systems are the main categories; CTAHR has a long Hawaii history of bait-system and physical-barrier research. Because these termites can build above-ground carton nests, treatment planning should begin with an inspection that identifies colony location, moisture conditions, and accessible treatment routes.

Compare termite treatment types and bait stations vs. liquid treatment.

Drywood

Infested furniture or removable wood may be isolated, removed, or professionally treated. A genuinely limited and accessible structural infestation may be considered for localized treatment or wood replacement. Widespread, inaccessible, or uncertain structural activity can lead to whole-structure tent fumigation.

Fumigation is regulated professional work, not a DIY procedure.

Dampwood & moisture

Correct leaks, drainage, ventilation, and wood-to-ground contact, then assess damaged wood. Moisture correction removes a condition that supports pests and decay, but it does not restore structural strength or prove that termites are gone.

Safety boundary: Hawaii treatment standards, the structure, and the product label determine professional application details. This guide does not provide termiticide mixing ratios, trench dimensions, drill patterns, fumigant concentrations, exposure times, aeration procedures, or tarping instructions. No method is universally best.

How to Choose a Termite Company in Hawaii

Hawaii regulates termite work through two agencies. The Department of Commerce and Consumer Affairs (DCCA), through its Board of Pest Control, licenses pest control operators and field representatives under the Pest Control Operators law, HRS Chapter 460J. The Department of Agriculture and Biosecurity (DAB), through its Pesticides Branch, certifies applicators who use restricted-use pesticides. Both systems can matter for a single job.

Verify the operator license and branch. DCCA pest control operator licenses use branches: BR-1 Fumigation, BR-2 General Pest, and BR-3 Termite. For non-fumigation termite work, confirm BR-3; for whole-structure tent fumigation, confirm BR-1. Check the licensed PCO/entity and responsible managing employee in the official DCCA license search. If a PCFR handles the inspection or proposal, verify that representative’s applicable branch and supervising PCO as well.
Confirm applicator certification for fumigation. Structural fumigation may only be performed under the direct supervision of an applicator certified in fumigation by the Department of Agriculture and Biosecurity. This is a separate system from the DCCA operator branches.
Require an evidence-based proposal. It should identify the organism or treatment route, affected areas, access limits, recommended work, and unresolved conditions.
Read every guarantee and renewal term. Compare treatment area, exclusions, follow-up inspections, renewal fees, treatment-only versus repair coverage, and transfer rules.
Distinguish treatment from repair coverage. A treatment-only agreement is not the same as a repair warranty. Read limits, waiting periods, and renewal terms.

Use our questions to ask a termite company and review the limits of DIY vs. professional termite treatment.

Buying or Selling a Home: Hawaii’s Termite Inspection Report

Hawaii uses an official Termite Inspection Report (the state PC-09 form), signed by a licensed PCO or responsible managing employee in BR-1 or BR-3; the form also identifies the inspector and supervising PCO when applicable. In a home sale it is commonly ordered, but whether it is required and what deadline applies depend on the signed contract or lender rather than a blanket legal requirement on every sale.

It is a visual inspection of areas accessible at the time of inspection. Obstructed, enclosed, or concealed areas are outside its findings and must be identified.
It is not a guarantee that termites are absent, and it does not assess structural integrity or repair cost. The form says its information is considered reliable for no more than 15 days after inspection.
Under Hawaii’s pest control law, the licensee is not responsible for later infestation unless termites in the inspected area were visible at the time of inspection.
The inspector must be independent of the transaction, with no financial or ownership interest in the property.

Separately, Hawaii’s Seller’s Real Property Disclosure Statement asks the seller to disclose known wood-destroying organisms. Read the report, attachments, inaccessible-area notes, and any treatment proposal together. A clean-looking accessible area cannot clear a concealed wall, slab joint, or closed crawlspace section that was not inspected.

What Does Termite Treatment Cost in Hawaii?

There is no responsible single Hawaii price. The termite group, activity location, structure size, foundation, access, previous treatment, local treatment versus fumigation, monitoring, moisture correction, repairs, and guarantee terms can all change the total.

Use our termite treatment cost guide for national orientation, then compare multiple written Hawaii proposals line by line. The least expensive quote may simply cover less of the structure or exclude follow-up.

What to Do Next

Document the evidence. Photograph tubes, pellets, wings, insects, moisture, and damaged areas without opening more of the structure. See our termite inspection tools guide.
Record where and when it appeared. Indoor versus outdoor location, dusk flights, attraction to lights, rain, and recurrence all help route the inspection.
Preserve a useful specimen. A winged reproductive or soldier is generally more useful for identification than a worker.
Use the decision guide. Follow the termite treatment decision tree to separate monitor, inspect, professional, and urgent routes.
Verify the Hawaii credentials. Match a DCCA operator branch to the work (BR-3 for termite work, BR-1 for fumigation) and confirm applicator certification when fumigation is proposed.

Bottom Line

Hawaii has eight introduced termite species, but the homeowner story is led by subterranean termites, above all the invasive Formosan “ground termite,” with the Asian subterranean termite established on Oʻahu. Drywood termites are the other main structural group, and a dampwood species rounds out the eight. Identify the evidence before choosing treatment, match the Hawaii license branch and applicator certification to the work, and treat the termite inspection report as a careful accessible-area report rather than proof that every hidden space is clear.

Hawaii Sources

How We Build Regional Guides

TermitePlan separates documented species distribution and treatment categories from what a homeowner can actually prove at home. Regional claims are based on university extension and government sources, while uncertain, hidden, structural, or high-risk cases are routed toward licensed inspection. See our Methodology.

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