How to Control Subterranean Termites: Complete Homeowner Guide (2026)

Subterranean Termite Identification

If you’re wondering what subterranean termites look like then here is what you should look for, the Alates or swarmers are dark-brown to black in color and range in size from ¼ to ½ inch long. They possess 2 pairs of wings that are very close in being equal in length. However, the workers are cream-colored have no wings, and are about ¼ inch or less in length.

Subterranean Termites Lifecycle

The lifecycle of subterranean termites goes through  3 stages, once the female lays the eggs the eggs take several weeks before hatching into nymphs. The nymphs will molt several times before reaching adulthood, once the termites reach maturity they take their place in the colony’s cast system., which includes, reproductive winged alates,  or swarmer, that break away to form new colonies. The life expectancy for termites is the queen can live up to 50 years under ideal climate conditions while the soldiers and workers live for about 1-2 years.

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What Causes Subterranean Termite Infestations

What Causes Subterranean Termite Infestations

Subterranean termites are attracted to conditions that make survival easy. Here are the most common causes:

• Excess moisture: Damp soil, leaks, or poor drainage create the perfect environment.

• Wood touching soil: Fence posts, decks, and siding that touch the ground provide direct access.

• Mulch against foundation: Mulch holds moisture and can act as a bridge for termites.

• Leaking pipes: Constantly wet areas near the foundation attract termites.

• Poor drainage: Water pooling near the foundation encourages termite activity.

• Tree stumps near the house: Termites feeding on old wood can easily migrate to your home

Signs of Subterranean Termite Damage

Subterranean termites eat wood 24 hours seven days a week, If control measures are not taken right away, subterranean termites can cause severe damage to homes and building structures. If you notice any of the following signs, it may indicate a subterranean termite infestation..

• The presence of flying termites.
• Visible discard wings.
•  An accumulation of soil or mud within the tunnels of the wood they are eating.
• Termite droppings ( the droppings are wood colored ranging from light beige to black and 0.0 4 inches long).
• Unlike drywood termites, which kick out dry, sand-like pellets (frass), subterranean termites mix their waste with soil and saliva to build their mud tubes. If you find dry, gritty pellets, you likely have a drywood termite infestation, which requires a different treatment method. Subterranean “droppings” will look more like dried mud or dirt packed into wood crevices.
• Paint that starts to bubble may be an indication of termites
• The sound of hollow wood when knocked.
• Blistering in wood floors
• Mud tunnels can be seen along exterior concrete walls and indoors as well as the home’s foundation, the mud tubes or tunnels are 0.5 to 2.5 cm in diameter about the width of a pencil, and usually an earthy brown color.
• These tubes are made from wood and soil combined with termite saliva.

Reiterate

Pro-Tip: Know Your Waste. Subterranean termites don’t leave dry pellets. Their waste is integrated into their mud tunnels to maintain moisture. If you see tiny, seed-like holes with “sand” underneath, you are likely dealing with drywood termites, not subterranean ones.

Note: It is best to consider calling first a professional company to do the job for you.

Caution: EPA labeling. It is technically a federal violation to use these chemicals in a way that is “inconsistent with its labeling.” For example, some termiticides cannot be used near wells or cisterns to prevent groundwater contamination.

How to Control Subterranean Termite

If you discover subterranean termites in your home, it’s important to act quickly before serious damage occurs.

• You can hire a professional company to do the job for you, they will charge you based on the extent of the damage which can be expensive if the damage is severe.
• Or you can do the job yourself and save hundreds of dollars, here is what to do. With a pickaxe or a shovel dig a trench, the trench against your house should be 6 inches wide and 6 inches deep. The trench should be against the foundation around the entire house. Next in a bucket mix the termiticide, the mixture is four gallons of water with the termiticide every 10 lineal feet that’s 4 gal=every 10 lineal feet. Evenly distribute the 4-gallon mixture to the 10-foot section then repeat the process and till you have covered the entire perimeter of the house on all sides. Once the termiticide has soaked in the soil it’s time to backfill with the dirt that was removed to dig the trench. The soil that you place back however is untreated so what you want to do is mix some termiticide in a 1-gallon sprayer then fill the spray bottle with water now go ahead and treat the untreated soil as you backfill. This process is easier if there is help, while you backfill with the shovel your helper can wet the soil with the termiticide by spraying. Once you’re complete you are good to go. However, before applying termiticide or any pesticides read and follow the manufacturer’s directions for the best results.

How to Treat Subterranean Termite In Wood or Wall Voids

Drilling in the wood or wall void will ensure that you are directly treating the infestation where the treatment will get into the termite gallery. Here is what to do.

• When drilling into wood drill small holes every 3-4 inches until you find a spot where the drill bit does not meet resistance, this will mean that you have hit the termite gallery. This is the area to apply the termiticide treatment.
• When drilling into drywalls drill each hole 18 inches from the floor, and in between each stud around the infested area, you can now go ahead and apply termite treatments inside of the holes. Here are different termite products that can be used to control termites. Bora-Care, Navigator SC Termiticide/Insecticide – 78 oz, Termidor SC, Termidor Foam, Taurus SC Termiticide, Bifenthrin-Plus-C etc…

Best termite treatments for termite control!

Installing Termite Bait Station

Termite bait stations do not serve as a barrier for termite control, if termites are already present a full treatment is required so consider hiring a professional company.

• To install termite bait stations choose the best spots every 10-15 feet around the perimeter of your home, and ensure that your utility company is notified to come to your property to locate wires that may become a potential hazard before you begin digging.
• Once you are given all clear by the power company begin digging in hazard-free spots with a shovel or a hand trowel, each hole should be dug 1-3 inches deeper than the length of the bait station. This will secure the wooden base from getting mold when the water builds up.
• Now place the bait station in each hole that was dug. Once the bait station is in place in the hole the top should be level with the soil.
• Each bait station comes with a wooden base and an inspection cartridge.
• Termites will be attracted to the wooden base and the inspection cartridge.
• Check the bait station at least once a month, or every three months. To check the bait station use the tool that comes with it to open the top.
• If termite activity is found replace the inspection cartridge with a Trelona Bait Cartridge. Terlona Bait Cartridge is effective and will eliminate 2-8 times the average colony size.
• Inspect Terlona Bait Cartridge 90 days after installation, once termite inspection is brought under control replace Terlona cartridge with a fresh inspection cartridge and continue quarterly inspections.

Another bait station that can be used is (25 Count) BASF – Advance Termite Bait Station Wood Bases TMB.

How to Prevent Subterranean Termite

There is a saying that ” prevention is better than cure” which is so true and can save hundreds or thousands of dollars in termite damage.

• Keep mulch away from the exterior of your house foundation.
• Hire a professional pest control company to treat your property with an in-ground bait system around your home or with a non-repellant chemical soil barrier.
• Avoid or eliminate wood-t0-soil and stucc0-to-soil contact.
• Ensure that your gutters are well-maintained by keeping them clean.
• Extend your gutter to about 1 foot away from your home, this will reduce and discourage moisture.
• Plant material should not make contact with the foundation and exterior of your home.
• Avoid the disturbance of termite treatments around your foundation.
• Make sure that your home is inspected annually by a licensed pest control operator.
• Cracks that are discovered around the exterior of your home or in the foundation should be repaired.
• Any water leaks in or around your home should be repaired immediately.

Since the spring swarming season (typically March through May) is the most common time to spot activity, having a structured “walk-around” guide is the best way to catch a problem before it becomes a structural catastrophe.

Here is an Annual Subterranean Termite Inspection Checklist designed for a homeowner to use once or twice a year.

 The Homeowner’s Annual Termite Inspection Checklist

1. The Perimeter & Foundation (Exterior)

• [ ] Mud Tubes: Check the foundation wall from the soil line up to the siding. Look for pencil-thin “tunnels” made of dried mud.

• [ ] Soil-to-Wood Contact: Ensure no wooden siding, lattice, or door frames are touching the bare dirt. There should be at least a 6-inch gap of concrete/brick visible.

• [ ] Mulch Levels: Is the mulch touching the siding? Pull mulch back at least 12 inches from the foundation. (Termites love the moisture mulch holds).

• [ ] Siding Check: Look for “bubbling” or “peeling” paint on the lower 2 feet of the house. Push on it with a screwdriver; if it’s soft, investigate further.

2. Moisture & Drainage

• [ ] Gutter Outfalls: Ensure splash blocks or extensions carry water at least 3 feet away from the foundation.

• [ ] Leaking Spigots: Check outdoor faucets for drips that keep the soil constantly damp.

• [ ] AC Condensate: Ensure the air conditioner’s drain line isn’t dumping water directly against the house wall.

3. Interior Warning Signs

• [ ] The “Thump” Test: Tap baseboards, window sills, and door frames with the handle of a screwdriver. Listen for a hollow “thud” or a “papery” sound.

• [ ] Windowsills: Look for discarded wings (they look like tiny fish scales) or “frass” (sand-like droppings).

• [ ] Ceilings & Walls: Look for tiny, pin-sized holes in drywall that appear to be plugged with mud.

• [ ] Floor Blisters: Check hardwood floors for raised “bubbles” or areas that feel “spongy” when stepped on.

4. Bait Station Maintenance (If Installed)

• [ ] Visibility: Ensure grass or weeds haven’t overgrown the station caps so they remain accessible.

• [ ] Internal Check: Open each station. If the wood/cartridge is more than 50% consumed or shows live white insects, upgrade to the active bait (like Trelona) immediately.

 Pro-Tip: The Screwdriver Test

When you go around the house, carry a flat-head screwdriver. If you see a suspicious mud tube, break a small 1/2 inch section of it. * If it’s active: You will see small, creamy-white “worker” termites scurrying to repair the break within a few hours.

• If it’s empty: It might be an old, inactive tube—but you should still treat the area to be safe.

10 Frequently Asked Questions (FAQs)

1. What are subterranean termites and why are they a big deal?
Subterranean termites are little bugs that are very sneaky and live underground feeding on wood. They form huge colonies and can silently chew through your home’s foundation, walls, and even furniture. The damage they cause is often hidden until it’s expensive to fix — that’s why early treatment is a must!

2. How do I know if I have subterranean termites?
Look for mud tubes along your foundation, hollow-sounding wood, bubbling paint, or swarming termites (especially in spring). If you see discarded wings near windows, that’s another indication of these bugs. Not sure? A professional termite inspection can confirm it for you.

3. What’s the best treatment for subterranean termites?
The best treatments are usually liquid termiticides and baiting systems. Liquid treatments create a protective barrier around your home, while bait stations attract and poison the colony over time. Often, pros use both for a one-two punch approach.

4. Can I treat subterranean termites myself, or do I need a pro?
DIY treatments might help small infestations, but subterranean termites are tricky. Their colonies can spread deep underground, making it hard to reach the queen. For long-term protection and peace of mind, hiring a licensed termite specialist is usually the smarter (and safer) choice.

5. How do bait stations work against subterranean termites?
Bait stations are placed in the soil around your home. Termites find the bait, take it back to the colony, and share it — including with the queen. Over time, the colony collapses. It’s a slow but highly effective process that targets the source.

6. Are termite treatments safe for kids and pets?
Yes — when applied correctly by professionals. Most modern termiticides are low in toxicity for humans and pets. Still, it’s always good to follow safety instructions like keeping kids and pets away from treated areas for a few hours just to be extra safe. Make sure and read the manufacture’s directions on the label for safety and proper use

7. How long does termite treatment last?
Liquid treatments can last anywhere from 5 to 10 years, depending on the product and soil conditions. Bait stations require more frequent monitoring — usually every few months — but they’re great for ongoing protection. Regular inspections help keep your home termite-free.

8. Will termite treatment damage my landscaping or lawn?
Not usually! Licensed pest control techs are trained to apply treatments without tearing up your yard. Bait stations are discreet and barely noticeable, and liquid barriers are applied with minimal disturbance. Your garden should stay safe and beautiful.

9. Is termite damage covered by homeowners insurance?
Unfortunately, no. Most home insurance policies don’t cover termite damage because it’s considered preventable with regular maintenance. That’s another reason why early treatment is so important — it saves you money in the long run.

10. How can I prevent subterranean termites after treatment?
Keep wood piles away from your home, fix leaks, and make sure your gutters drain properly. Moisture attracts termites! Regular termite inspections and annual monitoring (especially in warm, humid climates) are key to staying one step ahead.

Conclusion

Subterranean Termites are destructive and should be dealt with immediately once discovery is made, this guide will help you to save hundreds or even thousands of dollars. I have seen the damage these termites can cause weakening a house or building structure that is dangerous. Do it yourself or call in a professional company to do the job for you, you will be glad with the results as you stop termites in their tracks.