We Treated For Termites Years Ago. Is The House Still Protected?
A liquid termite treatment has to show at least five years of control before EPA will register it, and the strongest products in federal field trials held far longer than that. A bait system keeps working for as long as somebody services it. What ends protection early is rarely the chemical. It is usually soil that got moved.
This question comes up in two ways around Stark County. Somebody bought a house, found an old treatment record in the closing file, and wants to know what it is worth now. Or somebody had termite control done a decade ago, let the contract go, and has just seen something on a basement sill that looks wrong. The honest answer to both starts with what the five year number actually means.
What Does A Treatment Have To Prove Before It Is Sold?
Five years is not a marketing figure. It is the bar a soil termiticide has to clear to be registered at all, and it is measured in long running federal field trials rather than in a lab.
| Source | What it says about duration |
|---|---|
| EPA, Pesticide Registration Notice 96-7 | Soil applied termiticides should show efficacy for at least five years, and a product with less than five years of control is generally unsuitable for registration. |
| USDA Forest Service termiticide field tests | The trials EPA relies on are run outdoors at the lowest rate on the label, and the concrete slab protocol checks whether termites get through treated soil over at least five years. |
| Mississippi State University Extension, reporting those trials | The better termiticides have given 100 percent control for 11 to 12 years in the Forest Service trials in Mississippi. |
| The same trials, pyrethroid products | Pyrethroids provided at least 90 percent control for five to seven years, so the spread between active ingredients is wide. |
| Mississippi State University Extension, practical advice | It is a good idea to have buildings retreated approximately every 10 years, though that varies with the product that was used. |
| NC State Extension | Liquid termiticides are expected to stay effective for at least five years, which is not a guarantee termites will not get in during that time, and an annual inspection is how that level of protection is maintained. |
So a treatment from 2014 is not automatically finished, and a treatment from 2023 is not automatically intact. The date on the paperwork is one input. What happened to the ground since is the other.
Why The Barrier Fails Before The Chemical Does
A liquid treatment is a continuous treated zone in the soil around and under a foundation. Mississippi State University Extension puts the weak point plainly: even the best termiticide cannot protect a structure if that treated soil barrier is disturbed, and if you remove treated soil from the area or add untreated soil or mulch to it, you have created an entry point.
Almost nobody thinks of the following as termite work. Every one of them moves soil against a foundation.
- A downspout line or sump discharge trenched out away from the wall.
- A patio, stoop or deck footing dug in along the house.
- Landscape beds rebuilt, with fresh topsoil or mulch brought up against the siding.
- A utility trench for a gas line, a generator pad or a buried pet fence.
- Foundation waterproofing or drainage work, which replaces the soil against the wall outright.
- An addition or a sunroom, which is new construction attached to an old treated zone. What that needs on its own is covered in what termite protection a new Ohio house gets.
None of that shows up in a treatment record. It shows up in a homeowner remembering, three years later, that the landscaper regraded the back of the house.
What Changes When The Contract Lapses
This depends entirely on which kind of protection you had, and the difference is larger than most people expect.
With a liquid treatment, Mississippi State University Extension says the termiticide is probably still present in the soil, so protection does not usually end the day the agreement does. What ends is the annual inspection and the other protection the contract offered. The chemistry stays in the ground and keeps aging quietly, with nobody looking at it.
With a bait system, the same source is direct: protection ceases once the contract is allowed to lapse, because the company that installed the system will no longer inspect and maintain it. NC State Extension describes what follows a cancellation, where the stations are usually pulled or simply left unserviced, leaving little chemical protection in the soil and possibly a need for conventional retreatment. NC State also notes that stations are checked anywhere from annually to four times a year, with the number set by the product label, and that a baiting contract should include an annual inspection of the house itself.
That is the trade. A bait system is a service that runs continuously, which is why ours is set up to be maintained rather than installed and forgotten. Our Sentricon colony elimination system is monitored on a schedule and carries a one year renewable termite warranty, and State Shield Complete folds that monitoring into regular pest service.
Reasons To Look Before The Interval Is Up
Mississippi State University Extension lists three reasons to act ahead of any schedule: digging near the treated band, an active infestation, or reason to believe something has compromised the treatment. NC State Extension adds the sentence worth keeping in mind for either method, that no chemical termite treatment, liquid or bait, is 100 percent effective every time.
In an Ohio house the usual prompt is seasonal. Eastern subterranean termites swarm in spring here, and winged insects at a basement window in April are the loudest signal most homeowners ever get. Mud tubes and damaged wood turn up year round and in no particular order, and the detail that separates them from everything else is covered in how termite damage actually shows up.
Five Things To Check Before You Decide You Are Covered
- Find the paperwork and read what it actually describes. A liquid soil treatment, a bait installation and a one time spot treatment of a single area age very differently.
- Work out the date, then look at what the house has had done since. Every project in the list above is a question about the treated zone.
- Check whether anyone has inspected the house since the agreement ended. On a liquid treatment, that is the part that stopped, not the chemistry.
- Walk the perimeter for mulch and soil piled above the foundation line, and for wood sitting on dirt. Those conditions undo a treatment quietly.
- If the house changed hands, look for the inspection report from the sale. What that report does and does not promise is explained in our WDI inspection pages.
If you want a straight answer about where your house stands, an inspection is the only thing that gives one. State Termite has worked on Northeast Ohio houses since 1933, out of North Canton and Hartville, and we will tell you if what you already have is holding. The inspection fee is waived when you go with us for treatment. Ask for a visit through our quote form or call 330-494-6199, and bring the old paperwork to the appointment if you can find it.
Frequently Asked Questions
How long does a termite treatment last?
A soil applied termiticide has to show efficacy for at least five years before EPA will register it, under Pesticide Registration Notice 96-7, and products with less than five years of control are generally considered unsuitable for registration. In practice the spread is wide. Mississippi State University Extension, reporting USDA Forest Service field trials, says the better termiticides gave 100 percent control for 11 to 12 years, while pyrethroids held at least 90 percent control for five to seven years. The same source suggests retreating a building roughly every 10 years depending on the product.
If I cancel my termite contract, am I unprotected the next day?
It depends which kind you had. With a liquid treatment, Mississippi State University Extension says the termiticide is probably still in the soil, so protection does not end immediately. What you lose is the annual inspection and the rest of what the contract covered. With a bait system it is different: the same source says protection ceases once the contract lapses, because nobody is inspecting or maintaining the stations, and NC State Extension notes the stations are usually removed or left unserviced after a cancellation.
Does new landscaping or a new patio ruin a termite treatment?
It can, and this is the most common way protection ends early. Mississippi State University Extension states that even the best termiticide cannot protect a structure if the treated soil barrier is disturbed, and that removing treated soil or adding untreated soil or mulch creates an entry point. Trenching for a downspout line, digging footings for a patio or deck, drainage work against the foundation and rebuilt landscape beds all qualify. Any of them is a reason to have the treated zone looked at rather than assumed.
How often should an Ohio house with an older treatment be inspected?
Annually is the standard advice. NC State Extension says liquid termiticides are expected to stay effective for at least five years, that this is not a guarantee termites will not get in during that window, and that an annual inspection is the way that level of protection is maintained. For a bait system the inspection is built into the service, with stations checked anywhere from once to four times a year depending on the product label.
Can anyone tell by looking whether an old treatment is still working?
Not by looking at the soil, no. There is no field test that reads a termiticide level in the ground at your house. What an inspection does instead is look for the two things that matter: evidence of current termite activity in and around the structure, and the places where the treated zone was likely broken or bridged. Those, with the treatment record and the date, are what the answer is built from.
