Mud tubes on foundation or piers
Active foraging between soil and wood. Formosan tubes can be broader and more irregular.
Most Destructive Termite in the Lowcountry
Formosan Subterranean Termites in Mount Pleasant, SC
Year-round activity; swarming late April through May evenings
In one paragraph
Formosan subterranean termites are an invasive species that arrived in South Carolina via port activity and now populate coastal counties including Charleston County. They build larger colonies than native subterranean termites and can consume structural wood significantly faster. They swarm in late April and May, typically in the evening near lights.
Know the signs
How to tell
Any one of these is worth a look; two together usually means it is established.
Swarmers near lights in April-May evenings
Reproductives dispersing. A swarm inside the home means a mature colony is already in the structure.
Hollow-sounding wood or blistered paint
Termites consume wood from the inside. Late-stage indicators that damage is already extensive.
Why this keeps happening in Mount Pleasant homes
Formosan termites thrive in the warm, humid Lowcountry coastal climate. Charleston County has been a Formosan-infested area for decades, dating back to port introductions.
Pier-and-beam and crawl space homes give subterranean termites direct soil-to-wood contact. Homes without current termite treatment or a termite bond are at elevated risk.
Formosan colonies spread fastest where moisture and old wood sit close together, and the licensed pros we connect you with see that pattern repeat across the Lowcountry, not just in Mount Pleasant. The same swarms turn up near Ladson Road and the Highway 78 corridor, and out toward Moncks Corner where Biggin Creek keeps grade timbers damp for weeks after a storm. Isle of Palms, just across the water, deals with its own version tied to salt-air humidity. Anywhere subterranean moisture lingers against wood, Formosan pressure follows.
Common enough across Charleston County — Snee Farm, Old Village and I'On included.
Key facts
- Colony size
- Up to several million workers — far larger than Eastern subterranean colonies
- Swarm time
- Late April through May, evening hours, near lights
- Range in SC
- Coastal counties: Charleston, Dorchester, Berkeley, Beaufort
- Carton nests
- Formosans build moisture-retaining carton nests inside walls
- SCDPR note
- SCDPR-licensed operators required for soil treatment and bait systems
- When
- Year-round activity; swarming late April through May evenings
- What it runs
- an estimated $449–$1400
The look-alike worth ruling out
Eastern subterranean termites. Both swarm and produce mud tubes. Formosan swarmers are slightly larger and swarm at night in spring; Eastern subterraneans swarm during the day in late winter to early spring.
What treatment actually involves
Liquid soil treatment (termiticide applied around and under the structure)
Bait station installation (in-ground stations that deliver slow-acting bait through foraging workers to the colony)
Annual termite inspection under an active termite bond
Some formosan subterranean termites problems are genuinely finished after one visit. Others return every year whatever you do, and those are what a plan is for.
| The case | Usually the right call |
|---|---|
| A single active problem, found early | Single visit |
| Something that keeps reappearing | Recurring plan |
| A problem in wall voids, an attic or a crawl space | Treatment, then closing the way in |
The homeowner side of it
Over-the-counter termite products do not reach Formosan colonies, which can be several feet underground. DIY treatment of an active Formosan infestation is not effective.
What it costs
Most formosan subterranean termites jobs around Mount Pleasant land between an estimated $449 and $1400, and the property decides where inside that. The inspection costs nothing and the real number goes in writing before anyone starts. Estimated bands, and what pushes a job up or down them, are set out on the pricing guide, and the service that handles this is Termite Inspection.
More on this
Other things that turn up locally
Roof Rats
The Climbing Rat That Uses Palm Trees as Highways. Roof rats are the dominant rat species in coastal South Carolina.
Palmetto Bug (American Cockroach)
The Lowcountry Name for American Cockroach. Palmetto bug is the local Lowcountry term for the American cockroach — a large, reddish-brown roach that lives outdoors in mulch, palmettos, and storm drain systems and moves inside through gaps under doors, around plumbing, and from crawl spaces.
Questions & Answers
Frequently Asked Questions
What is a CL-100 and do I need one?
A CL-100 is the South Carolina Wood Infestation Report required for most real estate closings. A SCDPR-licensed inspector must complete it and report any evidence of termites or wood-destroying insects.
What is a termite bond?
A termite bond is a service agreement with a licensed operator that includes an annual inspection and retreatment or repair coverage if termites return. Confirm whether your bond covers Formosan termites specifically.
How quickly can Formosan termites cause damage?
Formosan colonies are much larger than Eastern subterranean colonies and can cause structural damage faster. An uninspected home near wooded or wet areas in Charleston County is at real risk.
Get Started Today
Dealing with formosan subterranean termites right now?
The inspection is free and you get a straight recommendation rather than a pitch. Same-day service where there is capacity for anything active.
Call (843) 896-1048