Bora-Care has very low acute toxicity to mammals, including humans, pets, and children. It carries the EPA’s lowest signal word, “CAUTION,” and is registered as a general-use pesticide, not a restricted one. That said, it is still a pesticide with a boron-based active ingredient, and it does pose real risks during application, if swallowed in quantity, or with prolonged repeated exposure.
What’s in Bora-Care
The active ingredient is disodium octaborate tetrahydrate, a boron salt closely related to boric acid and borax. Boron salts kill insects like termites and carpenter ants by disrupting their metabolism, but they affect mammals far less efficiently. In standardized toxicity testing, Bora-Care’s oral LD50 (the dose lethal to half of test animals) is greater than 5,000 mg per kilogram of body weight in rats. Its dermal LD50 is greater than 2,000 mg/kg in rabbits. For context, table salt has an oral LD50 of about 3,000 mg/kg. The manufacturer describes the product as having “very low acute mammalian toxicity.”
Risks During Application
The product is most hazardous in its wet, liquid state. The EPA label requires that no one enter or occupy treated areas during application or until the spray has been fully absorbed into the wood. Pets must be removed from the area, and fish aquarium pumps should be turned off and tanks covered. Aquatic organisms are far more sensitive to boron than mammals.
Breathing in mist or dust from boron compounds irritates the respiratory tract. Workers exposed to boron dust in mining and processing settings have reported dryness of the mouth, nose, and throat, dry cough, nosebleeds, sore throat, and breathlessness. When applying Bora-Care in enclosed spaces like crawlspaces or attics, adequate ventilation and protective equipment matter.
Skin and eye contact with the liquid concentrate can cause irritation. If you get it on your skin, washing with soap and water is typically sufficient. Eye contact warrants thorough rinsing.
Safety After It Dries
Once Bora-Care has dried and been absorbed into wood, the risk drops significantly. For treated wood flooring, the label specifies allowing 48 to 72 hours of drying time until the moisture content falls to 16% or below before applying a finish coat. If a surface still feels tacky or shows residue after 72 hours, the label recommends washing it with clean water and a sponge or mop, rinsing frequently, then letting it dry completely.
After the product is fully absorbed and dry, boron salts are locked inside the wood rather than sitting on the surface. This is one reason Bora-Care is considered a lower-risk option compared to many conventional termiticides. The boron becomes a concern only if someone were to ingest the treated wood itself or if the wood gets wet enough to leach the chemical out.
Pet and Child Safety
The main precaution for pets and children is keeping them away from treated surfaces until the product is fully dry and absorbed. The EPA label also specifies storing the product in its original container in a locked area inaccessible to children and pets. Accidental ingestion of the concentrated liquid would be the most dangerous scenario. While a small lick of a dried, treated surface is unlikely to cause harm, swallowing a significant amount of any boron compound can cause vomiting, diarrhea, and in severe cases, kidney damage.
Fish and other aquatic animals are particularly vulnerable. Even small amounts of boron runoff into an aquarium or pond can be lethal, which is why the label is explicit about covering fish tanks and shutting off their pumps during treatment.
What Happens If Someone Swallows It
Acute boron poisoning in humans requires a relatively large dose. At roughly 84 mg of boron per kilogram of body weight or higher, symptoms can include gastrointestinal distress, skin redness, and effects on the liver, kidneys, and central nervous system. Children are more vulnerable than adults because of their lower body weight. Lethal cases of boron ingestion, though rare, have involved respiratory failure as the ultimate cause of death.
Chronic ingestion of boron compounds in animal studies produces a more concerning picture: weight loss, vomiting, diarrhea, skin rashes, hair loss, anemia, and kidney damage. Severe chronic exposure has caused seizures, coma, and circulatory collapse in animal models. These outcomes require sustained, repeated oral exposure at high doses, not the kind of contact you’d get from living in a home with Bora-Care-treated framing.
Reproductive and Developmental Concerns
The most sensitive health endpoint for boron salts in animal research involves reproductive toxicity. In rats, mice, and dogs, chronic oral exposure caused testicular damage, reduced sperm counts, and decreased fertility in males. Female animals also showed reduced fertility, though the effect was less severe than in males at the same doses. In pregnant animals, boron exposure caused developmental problems in offspring, including skeletal abnormalities, lower birth weight, and increased fetal loss, sometimes at doses that didn’t visibly harm the mother.
Human epidemiological studies on workers exposed to boron compounds in industrial settings have not conclusively linked occupational exposure to reproductive harm. However, the EPA notes those studies have design limitations. The animal data is strong enough that the EPA considers reproductive and developmental toxicity the primary concern when assessing long-term boron exposure risks. For homeowners, the practical takeaway is that occasional exposure from a one-time termite treatment is a very different scenario than the chronic, high-dose oral exposure that produced these effects in lab animals.
How It Compares to Other Termiticides
Bora-Care is generally considered one of the less toxic termite treatment options available. Many conventional liquid termiticides use synthetic chemicals that carry higher acute toxicity ratings, stronger signal words, and more restrictive application requirements. Bora-Care’s boron-based formula breaks down to a naturally occurring mineral element rather than a synthetic compound.
The tradeoff is that Bora-Care only works on wood it can penetrate directly. It cannot be applied to soil like a traditional termite barrier treatment, and it does not work on wood that is already painted, sealed, or finished. This limits its use primarily to exposed wood during construction or renovation, or to accessible structural wood in crawlspaces and attics.