Fun Fact: Can Ants Survive Underwater? The Amazing Survival Skills of Ants

How Long Can Ants Survive Underwater In Sydney?

If you’ve ever hosed an ant nest only to see the same trails return 2 days later, this is the reason. Common Australian ants have evolved three key adaptations that make accidental drowning nearly impossible, even after full submersion.

For a full inspection to target ant nests properly and avoid DIY fails, Contact Sydney’s Best Pest Control.

How Do Ants Breathe And Stay Alive Underwater For 48 Hours?

How Ants Breathe Without Lungs

Ants don’t have lungs like humans or pets. They breathe through tiny, valve-like holes called spiracles that run along the sides of their bodies. These spiracles feed oxygen directly to their organs via thin, branching tubes called tracheae.

When ants hit water, they snap these spiracles completely shut. This stops water from entering their respiratory system entirely, so they don’t “drown” in the way we understand—no water reaches their organs to cause damage.

The Invisible Air Layer (Plastron) That Acts Like A Gill

All ants have a waterproof, waxy exoskeleton. When submerged, this exoskeleton traps a micro-thin, invisible layer of air against their body called a plastron. This film works like a physical gill, pulling tiny dissolved oxygen bubbles out of the surrounding water.

The plastron constantly replenishes the ant’s limited oxygen supply just enough to keep it alive. It’s so effective that common backyard ants can rely on it for 2 full days without needing to surface for fresh air.

How Slowed Metabolism Lets Them Outlast Floods

The third key adaptation is a dramatic drop in metabolic rate. When submerged, ants enter a low-power “survival sleep” state, cutting their energy use to roughly 1/10th of their normal foraging rate.

CSIRO’s 2024 Australian Insect Survey confirms this 90% reduction in metabolic demand is what lets common Sydney household ants (Iridomyrmex spp.) survive fully submerged for up to 48 hours with zero permanent damage.

If you pull an ant out before the 48-hour window closes, it doesn’t need resuscitation. It simply grooms water off its spiracles, takes 10–30 minutes to “boot back up,” and returns to foraging or nest work like nothing happened.

Underwater Survival Time: Ants Vs Common Creatures

Why Does Hosing Or Flooding An Ant Nest Never Fix Infestations In Sydney Backyards?

Every Sydney homeowner has tried it: hosing down ant trails, dumping buckets of water on nest mounds, or running sprinklers for hours to flood colonies out. It never works long-term—and now we know exactly why.

When you flood a nest, worker ants simply snap their spiracles shut, retreat to deeper tunnels, and ride out the moisture for 1–2 days. Sydney’s heavy clay soils hold water longer than sandy coastal soils, but even 48 hours of saturation isn’t enough to kill a healthy colony.

Boiling water is equally ineffective for large nests. A 2025 University of Sydney urban pest study found boiling water kills only 12-15% of ants in a typical 50,000-strong backyard nest. The queen, brood, and 80% of workers in deep tunnels survive unharmed, and rebuild the nest within 48 hours of the soil draining.

Store-bought spray repellents make it worse: they only kill surface workers, split colonies into multiple smaller nests (called budding), and leave the queen laying hundreds of new eggs every day.

Which Australian Ant Can Survive 2 Weeks Fully Underwater?

If 48 hours sounds impressive, a NSW native ant has evolved to survive 14 times longer. The mangrove ant (Polyrhachis sokolova) is found in mangrove ecosystems along the NSW and Queensland coast, including Sydney Harbour, Parramatta River, and Botany Bay.

Their mud nests are built directly in mangrove root systems, which get fully submerged by high tide twice every single day. To survive this regular flooding, they evolved a thicker, more efficient plastron air layer and an even slower metabolic rate than common backyard ants.

CSIRO’s 2023 Mangrove Ecosystem Report records Polyrhachis sokolova surviving 14 full days submerged in controlled lab trials. This matches field observations in Sydney’s Royal National Park, where colonies survive multi-day king tides that cover nests non-stop.

While they don’t invade Sydney homes, they’re a perfect example of how well Australian ants have adapted to our wet, variable climate—and why DIY flood methods are no match for any local ant species.

When Should You Call A Professional For Ant Control In Sydney?

DIY methods fail because they don’t target the queen—the only ant that reproduces. For most Sydney infestations, you’ll need professional-grade baits and nest treatments that workers carry back to the colony, eliminating the queen and stopping future generations.

Call a licensed technician if you notice any of these signs:

• Ant trails inside your home, especially in kitchens or pantries (a food safety risk under the Australia New Zealand Food Standards Code)
• Multiple nest mounds in your yard, especially near building foundations or electrical wiring
• Repeated infestations that come back within 1–2 weeks of DIY treatment
• Ants in sensitive areas: schools, childcare centres, cafes, or food preparation businesses

All professional pest control in Sydney must be carried out by EPA-licensed technicians, using products approved for residential and commercial use under NSW environmental regulations.

If hosing, boiling water, or store-bought baits haven’t stopped your ant problem, call our EPA-licensed Sydney team on 1800 819 189 for targeted nest treatment that eliminates queens and entire colonies completely.

Frequently Asked Questions

Can ants survive being flushed down the toilet?

Yes, common ants can survive 24–48 hours in toilet water. Most will pass through the plumbing alive, and if they end up in a moist sewer or drain environment, they can climb back out through pipe gaps or floor drains.

Will chlorine or saltwater kill ants faster than fresh water?

Chlorine in standard tap or pool water doesn’t speed up ant death—it still takes 48 hours for common ants to die. Strong saltwater may damage their exoskeleton slightly faster, but it still takes 24+ hours to kill most workers, and won’t reach deep nest queens.

How long does it take for an ant to die after being submerged?

Common Sydney backyard ants die after 48 hours of continuous submersion, once their plastron oxygen supply runs out and their metabolism can no longer sustain basic functions. Mangrove ants die after 14 days.

What is the most effective DIY ant treatment for Sydney homes?

Sweet or protein-based gel baits (matched to the ant species) are the only effective DIY option, as workers carry bait back to the queen. Hosing, boiling water, and surface sprays do not eliminate colonies.