How Long Does Termite Treatment Last?
"Five years" is the number everyone quotes. Some treatments last longer, some protect for exactly one day, and a garden shovel can cut any of them short.
The short version
A liquid soil treatment usually protects for about five years or more; to be registered, products must stop termites completely for five years in federal field tests. Bait systems last as long as someone keeps monitoring them. Tenting and heat kill the termites present that day and leave no protection behind.
On this page
How long each treatment lasts
Here's the short version for every common method. The details, and what shortens each one, come after.
| Treatment | How long it protects | What cuts it short |
|---|---|---|
| Liquid soil barrier | About 5 years or more, often longer under a slab | Digging, new concrete, additions, soil washing away |
| Bait system | As long as it's monitored and bait is replaced | Stations not checked, contract dropped |
| Fumigation (tenting) | Kills what's there that day, nothing after | New drywood swarmers move in later |
| Whole-house heat | Kills what's there that day, nothing after | Same as tenting |
| Spot treatment of wood | Years, in the treated wood only | Termites in untreated wood nearby |
| Borate wood treatment | As long as the wood stays dry and covered | Rain and ground moisture wash borates out |
Where "five years" comes from
Before a liquid termiticide can be registered in the U.S., it has to prove itself outdoors. The USDA Forest Service runs long-term field tests at experimental forests in the South, in some of the heaviest termite pressure anywhere.
The setup is simple and unforgiving. Crews treat small plots of soil, then put a piece of pine on top, either on bare ground or under a small concrete slab that mimics a house. Year after year they check whether termites got through. Under EPA guidelines adopted in 1996, a product must give 100 percent control for five years at every test site to pass.
So "five years" isn't a guess or a marketing line. It's the bar every modern liquid product has cleared in the worst conditions available. Many products keep working well past it, and under a slab, where rain and sunlight can't reach the soil, protection tends to last longer than in exposed soil.
What breaks a barrier
A liquid treatment is a continuous band of treated soil around the foundation. Its job is to make sure there's no untreated path from the colony to your wood. Anything that breaks the band, or adds a new path over it, cuts protection short.
- Digging. Planting beds, irrigation, fence posts and utility work can all remove or mix the treated soil.
- New concrete or additions. Patios, porches, room additions and driveway extensions often go in over untreated fill.
- Plumbing and slab repairs. Any job that opens the slab opens the barrier.
- Soil erosion. Gutters dumping at the foundation can wash soil, and the product in it, away.
- Raised beds and mulch piled against the wall. They create a bridge above the treated zone. See does wood chip mulch attract termites.
If you do any of these, call your termite company before the work, not after. Treating the new soil while it's open is quick. Finding the gap later is not.
Bait systems last as long as you pay attention
A bait system works differently. Stations sit in the ground around the house. Termites find the bait, carry it back, and the colony slowly declines. The protection is the monitoring: someone checks the stations, replaces the bait, and notices when new termites move in.
That makes bait a service, not a one-time product. It can protect a house for decades, and it stops protecting the day nobody checks the stations anymore.
Tenting and heat kill, they don't protect
Fumigation and whole-house heat are for drywood termites living inside the wood. Both kill every termite in the structure that day, and both leave nothing behind. The University of California and the University of Florida both say the same thing: there's no residue, so new swarmers can move in later. That's why many homeowners in drywood country add a local preventive treatment or a yearly inspection afterward.
Year by year after a liquid treatment
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Year one
The barrier is at full strength. Watch for swarmers in spring anyway, because termites already inside the walls can take a little while to die off.
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Years two to four
Most problems in this stretch come from something that disturbed the soil. Keep a note of any landscaping, plumbing or concrete work, and tell your termite company about it.
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Year five
This is where many treatments start to need attention, depending on soil and weather. If you're under contract, the yearly inspection should catch it. If you're not, schedule an inspection.
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After that
Expect a retreatment sometime after year five if you live in heavy termite country, or sooner if the soil was disturbed. A yearly inspection tells you when.
Questions people ask
How long does termite treatment last?
A liquid soil barrier usually protects for about five years or more, which is the minimum products must meet in federal field tests to be registered. Bait systems protect as long as they're monitored. Tenting and heat kill current drywood termites but give no lasting protection.
How often should you treat your house for termites?
Not on a fixed schedule. Get a yearly inspection in termite-heavy areas and retreat when the inspection finds activity, when soil around the foundation has been disturbed, or when a liquid treatment is past five years and conditions call for it.
Do termites come back after treatment?
They can. New colonies can arrive when a barrier fades or is broken, and drywood swarmers can reinfest a house after tenting. A warranty with yearly inspections is the usual answer. See do termites come back after treatment.
How long after termite treatment do termites die?
Many modern liquid products are non-repellent and slow-acting on purpose, so termites carry them back to the colony. Activity usually drops over weeks to a few months. Bait systems can take longer, since the colony has to find and share the bait.
Does landscaping affect termite treatment?
Yes. Digging beds, laying patios or piling soil and mulch against the foundation can remove or bridge the treated soil. Tell your termite company before any work near the foundation so they can treat the new soil.