Does Salt Kill Ants?

Bill Swank
Last updated: February 27, 2024

No homeowner enjoys dealing with a nasty ant invasion. These pesky insects can damage your property, contaminate your food, and even cause painful bites. It’s legitimately understandable why you would want to eliminate them as quickly and effectively as possible. In your search for a solution, you might have come across the idea of using salt to tackle your ant problem. But does salt really kill ants? In this article, we’ll dissect this commonly proposed method of ant control.

  • Salt can dehydrate and kill ants to a degree, given its hygroscopic properties. However, it only works at high concentrations and with prolonged or direct contact, making it inefficient for large infestations or as a long-term solution.
  • Salt might serve as a temporary deterrent for ants, especially when used to create barriers around entry points. Regardless, some ants may still cross if they are enticed by a strong attractant like food.
  • Using salt can potentially draw water from small insects, killing them through dehydration. But, as with ants, it’s not a comprehensive or persistent solution for insect control.
  • While salt poses little to no toxicity risk to humans and pets, it can damage household surfaces and garden plants. So, it must be used carefully and is not suitable for large-scale or outdoor deployments.
  • In comparison, salt is less effective than other natural ant control methods (like diatomaceous earth) and far less efficient than commercial insecticides or professional pest control services. While it might provide temporary relief from minor ant issues, more severe infestations likely need potent and targeted interventions.

Table of Contents

What is the Relationship between Salt and Ants?

How is salt typically used in relation to ants?

If you’ve found yourself dealing with an ant invasion, you may have come across a rather old-school recommendation: using salt. Salt is frequently cited as a household item that can be employed in your battle against ants. Its primary use? Either acting as a barrier to keep ants at bay or trying to kill ants directly by dehydrating them.

Does salt kill ants?

Technically, yes. Salt does have the ability to kill ants. The science behind this involves the process of osmosis. Osmosis causes an imbalance in the water concentration on two sides of a semi-permeable membrane. Salt, when it comes into contact with the ants, acts this way and draws out the essential water from their bodies.

How does salt affect ants?

Salt impacts ants primarily through dehydration. When salt comes into contact with an ant’s body, it absorbs moisture, drying out the ant from the outside, in. This can be fatal for ants – but only if the concentration is high enough and the direct contact can be maintained.

What does salt do to ants when consumed?

When consumed, salt can have detrimental effects on ants. The key factor here is salt’s ability to absorb water. When ingested in large amounts, salt starts dehydrating the ants from the inside, disrupting their body’s balance. Over time, this can lead to a fatal outcome for these tiny invaders.

Are ants attracted to salt?

Yes, ants are attracted to salt. In fact, a study published in the Journal Proceedings of the National Academy of Sciences found that ants that have low access to salt in their daily diet are actually more attracted to salt than sugar. This is because salt is essential for all animals, including ants, to maintain proper bodily functions. Salt helps to regulate blood pressure, fluid balance, and muscle function. Ants that live in areas with low salt content may be more likely to seek out salt as a way to supplement their diet.

However, ants do not prefer salt over sugar. Sugar is still the most attractive food to ants, as it is a high-energy food that provides them with the calories they need to survive. If ants are given a choice between salt and sugar, they will typically choose the sugar.

Despite their attraction to salt, it can be harmful to ants in large quantities. A very high concentration of salt can pull moisture out of the ant due to osmotic pressure, leading to desiccation.

Do ants eat salt?

Yes, ants do eat salt. Like most living creatures, they need salt in order to survive. Salt is an important mineral that helps to regulate the body’s fluid balance, nerve function, and muscle contraction.

The amount of salt that ants need also depends on their diet. Ants that eat a lot of insects will get more salt from their diet than ants that eat a lot of plants.

In general, ants need a small amount of salt to survive. However, the exact amount of salt that they need varies depending on the species and their environment.

How Can Salt Be Used as a Deterrent?

Does salt repel ants?

Yes, salt can act as a deterrent for ants. While it doesn’t necessarily “repel” ants in the same way certain chemical repellents might, sprinkling a line of salt around areas where ants are entering can discourage them from crossing. Here’s why salt might deter ants:

Physical Barrier

Salt’s rough texture could be a deterrent because it may be difficult or unpleasant for ants to walk across, especially if it’s a thick line of salt.

Chemical Disruption

Salt may interfere with the pheromone trails that ants use to navigate and communicate with one another. Disrupting these trails can make ants less likely to travel across the salt line.

Moisture Absorption

Salt has hygroscopic properties, meaning it can absorb moisture from the environment. In areas with humidity or moisture, a salt barrier might pull this moisture, making the path less attractive for ants.

However, while salt can act as a temporary deterrent, there are a few things to keep in mind:

  1. The effectiveness might vary based on ant species.
  2. Over time, the salt can become dispersed or diluted, especially in the presence of moisture or wind, reducing its effectiveness.
  3. If the attractant (e.g., food) on the other side of the salt barrier is strong enough, some ants might still cross it.
  4. Salt isn’t a long-term solution to ant problems and might need frequent reapplication to remain effective.

Will ants cross a salt line?

Ants aren’t usually deterred by thin lines of salt and will likely cross it. What they avoid is the physical discomfort of crossing a large and loose heap of salt. Imagine yourself trying to walk barefoot on a pile of coarse sand or small pebbles—it’s not that you’re necessarily hurt or ‘repelled’ by it, but you would naturally choose to take a smoother path if available.

Can salt be used to establish barriers against ant entry?

While salt lines may not repel ants effectively, slightly thicker barriers made from salt can be used as a temporary measure to limit the ants’ entry to specific areas. This method can be somewhat useful in situations where the ants are temporarily driven by a particular food source in your home. However, note this is not a permanent solution. Ants often find alternate routes, and you may find yourself surrounded by new ant trails elsewhere.

Are There Variations in the Impact of Different Types of Salt on Ants?

Does iodized salt kill ants differently than non-iodized salt?

Iodized salt is your everyday table salt with a twist – it’s been mixed with small amounts of iodine. This addition is an essential dietary measure to prevent iodine deficiency in humans, which can lead to health issues like goiter. But what does that mean for ants?

Interestingly, the presence or absence of iodine in the salt doesn’t significantly affect its impact on ants. Both iodized and non-iodized salt still have the ability to draw water from ants’ bodies due to their osmotic properties. Therefore, both types of salt can eventually lead to their dehydration and death.

Does table salt kill ants?

The table salt we so casually sprinkle on our meals can indeed be deadly to ants. Comprising mainly of sodium and chloride, this refined form of salt can dehydrate ants upon close contact or when used in high concentrations.

However, keep in mind that while table salt can kill ants, it’s far from perfect. Given its relatively fine grains and the high quantity required to exert substantial effects, it’s not the most efficient or practical method for controlling an ant infestation.

Does sea salt kill ants?

Sea salt, a culinary favorite, is derived from evaporated seawater. Notably chunkier and less uniform than table salt, it also includes additional minerals traced from the sea, which gives it a slightly different flavor.

In the context of our little invaders, the coarse granules of sea salt can indeed prove lethal. When it comes into direct contact with ants, sea salt can absorb vital moisture from their bodies, leaving them dehydrated to death.

Does kosher salt kill ants?

Renowned in Jewish dietary regulations, kosher salt, characterized by its coarse and flaky texture, is made from salt crystals. It’s ideal for drawing out blood from meat, and it’s less likely to host additives such as anti-caking agents or iodine.

Against ants, kosher salt doesn’t stray from its salty siblings. The larger grains might be a tad more successful in extracting moisture from ants compared to finer salts. However, as with the rest, trusty kosher salt’s killing potential remains quite low overall.

Is there a difference in the effectiveness of coarse vs. fine salt?

Ants can potentially walk more easily over fine salt, decreasing the likelihood of direct contact and dehydration. Coarser salts, with larger grains, might be more likely to stick to ant bodies and legs, slightly increasing its effectiveness.

Can salt water kill ants?

Yes, salt water can potentially kill ants. Saltwater is simply water that has salt dissolved in it. When used carefully, a highly concentrated solution of salt and water can dehydrate ants and disrupt their navigation. However, like all salt-based methods, it’s inefficient and may not exterminate the entire colony.

What Are the Methods of Using Salt Against Ants?

How can one use salt to kill ants?

There are a few ways you could use salt against ants.

  • Direct Application: This method involves sprinkling salt directly on individual ants or their visible paths. You could also lay a thick layer of salt around entry points and across their regular trails.
  • Salt Lines: Drawing lines of salt in places where you spot ants could act as a deterrent, discouraging them from crossing.
  • Salt Solution: Dissolve substantial salt amounts in hot water, cool, and transfer the saline solution to a spray bottle. Spraying this directly onto ants or ant trails can be moderately effective.
  • Hot Salt Water: For visible ant mounds in your yard, rapidly boiling saltwater poured directly into the mound can cause harm. This approach is particularly destructive for ant nests, causing immediate and high mortality rates among the resident ants.

Can you get rid of ants in the kitchen with salt?

While salt is not the most effective method to get rid of ants permanently, it may provide a temporary reprieve from a minor ant presence in the kitchen. You could create barriers along window sills, doorways, or other entrances by sprinkling a substantial amount of salt. This may discourage ants from entering these areas. However, remember this is just a stop-gap measure, and stronger, more permanent solutions will likely be needed to completely eliminate an infestation.

Does sprinkling salt directly on ants kill them?

Yes, sprinkling salt directly onto ants can kill them. The salt’s hygroscopic nature sucks out moisture from the ants’ bodies, leading to dehydration. However, the effectiveness is quite limited, and this method is unlikely to exterminate a large number of ants or a whole colony.

How effective is using boiling water mixed with salt against ant mounds?

Pouring boiling salt water directly into an ant mound can be quite effective at killing a large number of ants instantly due to the high temperature and dehydration caused by salt. However, some ants may still survive, especially those that reside at deeper levels of the mound.

This method should be undertaken with caution and is not the most environmentally friendly approach. Prolonged salt deposition can end up increasing soil salinity, which may have detrimental effects on local vegetation and beneficial insects.

What Other Insects or Bugs Might Be Affected by Salt?

Does salt kill other insects besides ants?

Salt has a similar effect on many other small insects and pests as it does on ants. For instance, it also dries out fleas, slugs, and leeches, often killing them.

Does salt repel bugs?

Salt cannot be considered a potent repellent for bugs. While it might deter certain pests temporarily due to its dehydrating properties, most insects, just like ants, will ultimately find ways around a salt barrier if a strong attractant is at stake.

Does salt attract bugs?

Salt itself doesn’t necessarily attract bugs. However, if available food sources contain salt, many bugs, ants included, will be attracted. They are primarily drawn by the scent of the food rather than the salt per se. It’s also worth noting that bugs need salt, just like all living creatures, for their biological functions.

Is Salt a Safe and Effective Solution for Ant Control?

How safe is salt as a method to kill ants for humans and pets?

Using salt to kill ants presents little to no risk to humans and most pets. Salt is a naturally occurring substance and is generally nontoxic. However, it’s still essential to prevent pets from consuming large quantities of salt, as it could lead to salt poisoning, which can be fatal in severe cases.

Moreover, remember that while salt doesn’t pose a toxic hazard, it can damage household surfaces and garden plants due to its corrosive and dehydrating properties if used indiscriminately.

What are the potential drawbacks of using salt for ants?

Despite being a readily available household item, salt isn’t the best solution to ant problems for the following reasons:

  1. Limited effectiveness: Salt can kill ants through dehydration only when used in large quantities or with direct contact over time. It’s not very competent at exterminating the whole colony, especially for large infestations.
  2. Potential damage to your home: Salt can spoil metal and wooden fixtures and can stain fabric or carpeting.
  3. Possible harm to plants: If used outdoors, salt can increase the soil’s salinity, harming helpful creatures in your garden and damaging or even killing plants.
  4. Not a long-term solution: Salt can deter ants temporarily, but it doesn’t address the root cause of attraction.

What are the safety measures to consider when using salt to kill ants?

While using salt, adhere to the following safety pointers:

  • Limit its use to specific areas to avoid unnecessary damage to your property and plants.
  • Keep pets away from treated areas to prevent accidental ingestion.
  • Discontinue if the ant infestation seems uncontrolled. It’s advisable to seek professional help for efficient and long-lasting solutions.

How can I use salt to kill ants safely?

If you resort to using salt against ants, ensure you:

  • Stick to limited, focused applications.
  • Target only the ant-prone or infested zones.
  • Prevent any large-scale or indiscriminate application of salt, especially outdoors where it may harm plants or helpful insects.

What Are the Limitations and Effectiveness of Using Salt for Ant Extermination?

How effective is salt for killing ants?

Salt is not the most effective method for killing ants, especially when dealing with a large or persistent infestation. Salt can disrupt the chemical communication between ants and rupture their protective external coatings, leading to dehydration and death. But its effectiveness is restricted to direct application, is not efficient at exterminating entire ant colonies, and is not lasting.

Does salt actually keep ants away?

Salt’s capability to keep ants away is short-term and circumstantial at best. Salt can form a temporary barrier that ants may be reluctant to cross. However, it does not universally “repel” ants. A scent or food source strong enough may still entice ants to cross. Also, recall that with changes in environmental conditions such as rain or wind, salt’s barrier can get disrupted.

Does salt kill ants instantly?

No, salt does not kill ants instantly. Salt must be in direct contact with the ants for a period of time to extract enough water to dehydrate and kill them.

Can salt get rid of ants completely or just deter them?

Salt alone is unlikely to rid your property of ants completely, especially if there is a large ant colony or multiple nests nearby. Its effectiveness is limited mostly to deterrence or causing minor disruptions in ant activity rather than comprehensive extermination.

How does salt compare to other natural methods in terms of effectiveness?

Compared to other natural pest control methods, salt stands inferior in terms of effectiveness. Alternatives like diatomaceous earth or borax may have more substantial results in disrupting an ant colony’s regular activity and can be more lasting.

How does salt compare to commercial insecticides in terms of effectiveness?

Salt can’t compete with commercial insecticides when it comes to effectively controlling or eliminating ants. Professional products are specially designed to act on multiple levels, typically targeting the whole colony, including the queen. They are also more potent and persistent.

How can I use salt to kill ants effectively?

To increase the effectiveness of salt against ants, you can:

  • Apply it directly to the ants or their trails,
  • Use a high concentration of salt, preferably coarse,
  • Regularly reapply the salt treatment, and
  • Use it in combination with other natural ant control methods that are proven effective.

Are there better alternatives to consider for ant control?

Definitely, there are more efficient and potent alternatives to handle your ant problem. Other household items like borax or diatomaceous earth can be quite useful at repelling or killing ants. Mainly, professional pest control methods or commercial ant baits and traps usually provide a more reliable and lasting resolution to ant infestations.

Remember the best ant control method is prevention—keep your home clean, particularly the kitchen and dining areas, seal all potential entries for ants, and immediately address any signs of an infestation.


While salt can disrupt ants activity and potentially kill those it directly contacts, it is not a comprehensive or long-term solution for ant problems. Its true power might be in its ability to form temporary barriers and mild deterrence. However, larger infestations will likely require more powerful and targeted interventions, potentially calling for professional pest control services. In the grand scheme of ant control, the best strategy focuses on prevention first—keep food tightly sealed, spaces clean, and the property well maintained to prevent enticing these pesky invaders into your home in the first place.

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