Ticks do not die in water, at least not quickly. Some species survive fully submerged for weeks or even months, making a dunk in the toilet or a rinse in the sink a surprisingly unreliable way to kill them. The reason involves a clever respiratory trick and a body built for hostile environments. Understanding what actually kills ticks matters if you spend time outdoors, own pets, or just found one crawling across your bathroom floor.
Why Ticks Can Breathe Underwater
Ticks breathe through small openings called spiracles, located on the sides of their bodies. When submerged, many tick species trap a thin film of air against their body surface using tiny water-repellent hairs. This air layer functions like a physical gill, pulling dissolved oxygen from the surrounding water and feeding it to the spiracle. Researchers studying the American dog tick confirmed this mechanism, known as plastron respiration, and showed that ticks survived longer in oxygenated water than in deoxygenated water, proving they were actively extracting oxygen from their surroundings rather than simply holding their breath.1PubMed. Underwater survival in the dog tick Dermacentor variabilis (Acari:Ixodidae) When that air layer was disrupted by wetting the spiracular plate with alcohol, ticks died much faster.
On top of this respiratory trick, submerged ticks appear to slow their metabolism dramatically. This combination of reduced energy demand and passive oxygen absorption from water means that simply dropping a tick into a glass of water is closer to giving it a long bath than a death sentence.
How Long Ticks Survive Submerged
The survival times are strikingly long and vary by species. Lone star ticks survived up to 70 days fully submerged in freshwater in laboratory conditions, followed by 64 days in brackish water and 46 days in saltwater.2PubMed. Assessing the underwater survival of two tick species, Amblyomma americanum and Amblyomma maculatum Gulf Coast ticks were less hardy but still lasted up to 24 days in freshwater. Brown dog ticks, one of the most common species found indoors, survived complete submersion for at least 48 hours, with some individuals lasting 72 hours, and their eggs remained viable after being flooded for up to five full days.3PubMed. Underwater survival of Rhipicephalus sanguineus (Acari: Ixodidae)
Tick eggs also show resilience to flooding. Research on lone star tick and winter tick eggs found that egg clusters can remain viable after being submerged for at least two weeks, which raises the possibility that floodwaters could actually redistribute tick populations rather than eliminate them.4PubMed. Developmental stage and level of submersion in water impact the viability of lone star and winter tick eggs An older study on cattle ticks similarly found that eggs and larvae were more resistant to submersion than engorged adult females, and that survival was even longer in cooler, oxygen-rich water.5Springer / Oecologia. An experimental investigation into the effects of flooding on the ixodid tick Boophilus microplus (Canestrini)
The practical takeaway: flushing a tick down the toilet will send it on a journey, but the water itself is not what kills it. If it ends up in a septic system or sewer, it will likely die from other causes. But tossing a tick into a cup of water and assuming it is dead by morning is a mistake.
Why Your Washing Machine Probably Will Not Kill Them
One of the most common assumptions people make is that running tick-exposed clothing through the laundry will take care of the problem. The research here is surprisingly discouraging. A study on blacklegged ticks (the primary carrier of Lyme disease in the eastern United States) found that all ticks survived cold water washes. The vast majority, around 94%, also survived warm washes in the temperature range of roughly 27 to 46°C (80 to 115°F). Even hot washes failed half the time when the water temperature stayed below 54°C (130°F).6PubMed. The heat is on: Killing blacklegged ticks in residential washers and dryers to prevent tickborne diseases
An earlier study tested nymphal ticks of two species and found similar results. More than 90% of nymphs survived cold and warm washes for both lone star ticks and blacklegged ticks. Lone star tick nymphs were especially hardy, with 95% surviving a hot wash. Among blacklegged tick nymphs that appeared incapacitated right after a hot wash, about two-thirds were found alive a day later. Adding detergent, including products containing non-chlorine bleach, did not meaningfully change the outcome.7Journal of Medical Entomology. A Cautionary Note: Survival of Nymphs of Two Species of Ticks (Acari: Ixodidae) Among Clothes Laundered in an Automatic Washer
The only reliable laundry kill came when water temperatures reached at least 54°C, at which point all nymphal and adult ticks died.6PubMed. The heat is on: Killing blacklegged ticks in residential washers and dryers to prevent tickborne diseases Many household washers, especially those set to “warm” or on energy-saving cycles, never reach that threshold. So if you are relying on the wash cycle alone, your clothes may come out with live ticks still attached.
Heat Is What Actually Works in the Laundry
The dryer, not the washer, is the real weapon. High heat in a tumble dryer reliably kills ticks across all life stages. The same study that documented widespread washing machine survival found that a high-heat dryer cycle was lethal. If your clothes are already dry, running them through the dryer on high heat for about ten minutes is generally enough. If clothes are damp from a wash, a longer cycle is needed to ensure temperatures stay high throughout.
This means the most effective laundry protocol after potential tick exposure is counterintuitive: dry first, then wash. If you toss damp clothing into a warm wash and then air-dry, you have given the ticks a swim and a rest. If instead you throw dry clothes into a hot dryer for ten minutes, you kill any ticks before they have a chance to crawl off the fabric and onto you while you sort laundry. You can then wash normally afterward.
Chemical Methods That Kill Ticks Directly
If you have a tick you want dead right now, rather than waiting days for submersion to maybe work, certain chemicals are fast and effective. Researchers testing common reagents found that rubbing alcohol (70% isopropyl) and 95% ethanol both killed nymphal ticks within about five to six minutes, though adult ticks took closer to 19 minutes.8PubMed Central. Efficacy of common reagents for killing ticks in the ear canal Pure acetone was faster and killed all ticks tested. A couple of adult ticks survived the full ethanol or isopropyl alcohol exposure period but were confirmed dead within 24 hours.
This matters if you have pulled a tick off your body or your pet and want to make sure it is dead before disposal. Dropping it into a small container of rubbing alcohol is one of the more reliable home methods. Tape also works as containment: folding a piece of clear tape over the tick immobilizes it, and the tick will eventually die from desiccation, which we will get to in a moment. Some people save the taped tick to show a doctor in case symptoms develop later, which is a practical bonus.
What does not work well is soap and water. People sometimes try to drown ticks in soapy water, reasoning that the soap will break surface tension. While soap does interfere somewhat with the air layer ticks use for underwater respiration, it is not a fast or sure method. You would need prolonged submersion, and even then, results are inconsistent.
Cold and Freezing
Extreme cold can kill ticks, but the temperatures required are lower than most people expect. Research on American dog tick larvae found that a lethal temperature for most individuals during a two-hour exposure was around -20°C (-4°F), with half dying near -16°C (3°F).9PubMed. Cold hardiness and influences of hibernaculum conditions on overwintering survival of American dog tick larvae The temperature at which larvae actually froze internally was about -23°C (-9°F), and no larvae survived reaching that point.
Nymphal and adult ticks of several common species showed supercooling points (the temperature at which ice forms inside their bodies) ranging from about -8°C to -22°C depending on species and life stage. But here is the wrinkle: ticks often die at temperatures warmer than their supercooling point when moisture is present. Contact with ice triggers a process called inoculative freezing, where ice crystals from the environment seed through the tick’s body wall. This killed nymphs of some species at temperatures as warm as -3 to -5°C (about 23 to 27°F).10Physiological Entomology. The role of direct chilling injury and inoculative freezing in cold tolerance of Amblyomma americanum, Dermacentor variabilis and Ixodes scapularis Since ticks need humid microhabitats to survive off-host, they are often in contact with moisture in the wild, making inoculative freezing a significant cause of natural winter mortality.
For European species, similar patterns hold. Both the pigeon tick and the castor bean tick proved highly susceptible to inoculative freezing, and neither showed improved cold tolerance in winter compared to summer, suggesting they do not undergo a seasonal hardening process.11Journal of Insect Physiology. Cold hardiness, supercooling ability and causes of low-temperature mortality in the soft tick, Argas reflexus, and the hard tick, Ixodes ricinus (Acari: Ixodoidea) from Central Europe
From a practical standpoint, sticking a tick in your home freezer (typically around -18°C or 0°F) for a day or two will kill most species, though it is slower and less satisfying than rubbing alcohol.
Heat Beyond the Dryer
Ticks are also vulnerable to high temperatures outside the laundry context, though their heat tolerance varies by species. Larvae of various tick species died at temperatures between 41 and 47°C (roughly 106 to 117°F), with brown dog ticks tolerating the highest upper lethal limit.12PubMed Central. Larval thermal characteristics of multiple ixodid ticks Brown dog ticks have an additional survival trick: they secrete compounds from dermal glands that improve their short-term heat shock survival, bumping their tolerance from one hour at 50°C up to one hour at 56°C (about 133°F).13Journal of Thermal Biology. Dermal gland secretion improves the heat tolerance of the brown dog tick, Rhipicephalus sanguineus, allowing for their prolonged exposure to host body temperature That adaptation is partly why brown dog ticks are so successful as indoor pests in warm climates.
If you are thinking about whether leaving your car parked in the summer sun would kill ticks on gear inside, the answer depends on how hot the interior actually gets. A closed car in direct sunlight can reach 60°C (140°F) or higher on the dashboard and in direct-sun zones, which would likely be lethal. Shaded areas inside the car may not reach lethal temperatures consistently. A dryer cycle is more reliable.
Drying Out Is the Real Vulnerability
Water does not kill ticks easily, but lack of water does. Ticks are remarkably susceptible to desiccation. In the wild, most species need to periodically return to moist leaf litter to rehydrate, and drying conditions kill them faster than almost anything else. Research on blacklegged tick nymphs showed that at 40% or 60% relative humidity, most ticks died within 24 hours of continuous exposure. Even at 82% humidity, only about 60% survived when the exposure was constant.14Journal of Medical Entomology. Duration of Exposure to Suboptimal Atmospheric Moisture Affects Nymphal Blacklegged Tick Survival
This is one of the reasons ticks are far less common in dry, open, sun-exposed areas and thrive in shady, humid forest edges and undergrowth. It also explains why strategies like keeping lawns short, removing leaf litter near homes, and creating dry gravel or wood-chip borders between yards and wooded areas are effective at reducing tick encounters. You are not poisoning the ticks; you are making the microclimate too dry for them to survive.
What Flooding Does and Does Not Do
Given how well ticks survive underwater, it should not be surprising that natural flood events are not a reliable tick-control method. A study along the Danube River in Austria tracked tick abundance before and after seasonal flooding. Tick numbers did decline after floods, dropping roughly fivefold on the outer bank and twentyfold on the inner bank. However, the researchers concluded that the sediment deposited by the flooding had a greater impact than the water itself. Ticks were buried, and their habitat structure and host animal access were disrupted.15PubMed Central. Tick abundance: a one year study on the impact of flood events along the banks of the river Danube, Austria
Researchers who tested lone star and Gulf Coast tick submersion survival concluded that any short-term flooding event lasting less than a week would be unlikely to eliminate these species from the flooded area.2PubMed. Assessing the underwater survival of two tick species, Amblyomma americanum and Amblyomma maculatum And because tick eggs can survive at least two weeks underwater, floodwaters may actually carry eggs to new locations, potentially expanding a tick population’s range rather than shrinking it.4PubMed. Developmental stage and level of submersion in water impact the viability of lone star and winter tick eggs
Removing an Attached Tick Safely
Knowing how to kill a free tick matters, but if one is already attached to you, the priority is removing it correctly. The standard recommendation is to grasp the tick as close to the skin as possible with fine-tipped tweezers and pull straight upward with steady, even pressure. Twisting and rotating during removal is sometimes suggested but tends to break off the mouthparts. A comparison of techniques found that pulling straight out with blunt forceps frequently removed the tick completely, while rotating the tick around its body axis tended to snap off the tip of the hypostome (the barbed feeding tube), leaving a small fragment in the skin.16Oxford Academic (Journal of Medical Entomology). Removal of Attached Nymphs and Adults of Ixodes ricinus (Acari: Ixodidae) A small retained fragment is generally not dangerous and will eventually be expelled by the body, but complete removal is preferable.
There is an interesting counterpoint from research on tick-induced allergic reactions, which are a concern in parts of Australia and elsewhere. A systematic review found that killing the tick in place before removal (using methods like permethrin-based creams or ether-containing sprays applied to the attached tick) resulted in allergic reactions in very few patients, while conventional removal with tweezers was associated with allergic reactions in the majority of patients who then presented to emergency departments.17Europe PMC. A systematic review of tick removal techniques: Relationship to outcomes of tick-induced allergic reactions and tick-borne illnesses Among patients with known tick anaphylaxis, killing the tick in situ before removal prevented subsequent anaphylactic reactions entirely. The same review also found that gentle pressure or crushing the tick before removing it with fine-tipped forceps was associated with decreased disease transmission for both Lyme disease and spotted fever pathogens.
This challenges the widespread advice to never squeeze or disturb a tick before removing it, which is based on the concern that agitating the tick might cause it to regurgitate pathogens into the wound. The evidence here suggests the picture is more complicated, and the best approach may depend on whether allergic reaction or pathogen transmission is the primary concern. For most people in North America and Europe, the standard fine-tipped tweezers technique remains the most widely endorsed method. But if you have a history of severe allergic reactions to tick bites, talk to your doctor about in-situ killing approaches before your next tick encounter.
A Quick-Reference Approach to Killing a Tick
Given all of the above, here is what actually works when you need a tick dead:
- Rubbing alcohol: Drop the tick into a small container of 70% isopropyl alcohol or higher. Nymphs die within about five minutes; adults may take up to 20 minutes but will not survive.
- High-heat dryer: For clothing, run a high-heat dryer cycle for at least ten minutes if clothes are already dry, or a full cycle if they are damp. Do this before washing, not after.
- Hot water wash: Only effective if your water heater delivers water at or above 54°C (130°F) to the machine. Warm and cold cycles are useless against ticks.
- Freezer: Sustained cold around -18°C (0°F) for a day or more will work, though it is slower than chemical methods.
- Adhesive tape: Folding tape over the tick immobilizes it and leads to death by desiccation over hours. Also useful for preserving the tick for identification.
Methods that are unreliable or actively counterproductive include flushing (the tick may survive the water), drowning in plain water (takes days to weeks), applying petroleum jelly or nail polish to an attached tick (these “smothering” techniques are slow and may irritate the tick into regurgitating), and burning with a match (ineffective and likely to hurt you more than the tick).
Why Ticks Are So Hard to Kill in General
Ticks occupy a strange niche among blood-feeding parasites. Their life cycle can span two to three years, most of which is spent off-host, sitting in leaf litter waiting for a meal. That lifestyle demands extreme patience and resilience. They have evolved to survive freezing, flooding, months without food, and prolonged exposure to environmental extremes. Their cuticle is waxy and resistant to water loss when conditions are right. They can shut down their metabolism to bare minimum levels. Their respiratory system works both in air and, as the plastron research shows, underwater.
This durability is part of why tick-borne diseases have been increasing in recent decades. Ticks are generalists with tremendous staying power. They do not die easily from incidental environmental changes, and warming temperatures in many regions are expanding the zones where they can overwinter successfully. A tick that can survive 70 days submerged in freshwater and shrug off a warm-water washing machine cycle is not going to be eliminated by a rainy week or a mild winter.