Yes. In its head lice overview, the CDC says head lice can survive under water for several hours, and that chlorine levels in pool water do not kill them. The same page says head lice are unlikely to spread in a swimming pool. So an afternoon in the water will not clear an infestation, and the water itself is not how lice move from one child to another. What matters at a pool is hair-to-hair contact and shared items. What ends an infestation is treatment.
How Long Can a Louse Stay Under Water?
Several hours, by the CDC’s account, so no infestation is getting drowned at the deep end. The CDC describes head lice as parasitic insects that live on the scalp and feed on human blood.
A louse that comes off in the water has a different problem. The CDC says lice will die within two days if they fall off a person and cannot feed, so pool water is not a place head lice live; it is a place a stray louse ends up. On a head the clock runs far longer, and the CDC puts the life of an adult louse there at about 30 days.
What Pool Chlorine Does Not Do
Chlorine levels in pool water do not kill head lice. That is the CDC’s own line, and it settles the chlorine question. What the CDC does name as treatment is medication, either over the counter or by prescription.
Heat has a specific job in the CDC’s guidance: hot water at 130 degrees Fahrenheit for laundry and for soaking combs and brushes, which our post on whether hot water kills lice in your laundry covers.
The CDC and the American Academy of Pediatrics put the options in plain terms:
| What you are trying | What the CDC or the AAP says it does |
|---|---|
| Swimming in a chlorinated pool | Chlorine levels in pool water do not kill head lice. |
| Being under water | Head lice can survive under water for several hours. |
| Soaking combs and brushes | Hot water of at least 130 degrees Fahrenheit for 5 to 10 minutes disinfests them. |
| Washing clothing, towels and bed linens | Use the hot water cycle at 130 degrees Fahrenheit and high heat drying for items worn or used in the two days before treatment. |
| Head lice medicine | The AAP calls it the most effective way to treat head lice. |
Do Nits Come Off in the Water?
No. Water is not what takes nits off hair. The AAP says nits attach to the hair with a sticky substance that holds them firmly in place, that lice lay and attach their eggs close to the scalp, and that eggs are usually found within 4 to 6 mm of it and do not survive farther away. The CDC’s tool for taking nits off is a nit comb, and what it describes as killing eggs is medication: some medicines kill lice and eggs, so retreatment is usually not required for those.
White specks after a pool day are not proof of an active case on their own. The CDC says nits attached more than 1/4 inch from the base of the hair shaft are almost always hatched or dead, and that nits are often confused with dandruff, hair spray droplets and dirt particles. The AAP’s test is that nits are firmly attached to the hair while dandruff and dirt are not. Finding a live nymph or adult louse on the scalp or hair is the best way to diagnose an infestation, the CDC says, and what a live head louse looks like up close shows what you are hunting for.
Where the Real Risk at a Pool Party Sits
In the heads touching, not in the water. The CDC says the most common way to get head lice is head-to-head contact with a person who already has them, and the AAP puts the main route as close, prolonged head-to-head contact. At a pool that is two children sharing a float, a huddle in the shallow end, or wet hair pressed together over one screen on a towel.
Shared items are the smaller route. The CDC says head lice may spread by wearing hats, scarves, coats or hair ribbons worn by someone infested, and by using infested combs, brushes or towels, though it calls that route not as common; the AAP calls it a very small chance. The CDC’s advice for a crowded pool deck comes down to four habits:
- Avoid hair-to-hair contact during play.
- Do not share combs, brushes or towels.
- Do not share clothing such as hats, scarves, coats, sports uniforms, hair ribbons or barrettes.
- Do not lie on beds, couches, pillows, carpets or stuffed animals that have recently been in contact with a person who has head lice.
Hair ties, clips and a shared brush can share a pool bag, and we take that question up in can lice live on hairbrushes, headbands and clips.
What Ends an Infestation, and How to Check First
Treatment ends an infestation, and a careful check comes first. The AAP says head lice medicine should be used only when it is certain that your child has living head lice, and to check with your child’s doctor before beginning any treatment. Its method: seat your child in a brightly lit room, part the hair, and work section by section with a fine-tooth comb, wiping the comb on a wet paper towel after each pass and examining the scalp, comb and towel. The easiest place to find them is at the hairline at the back of the neck or behind the ears, and the AAP warns that live lice are hard to find because they avoid light and move quickly.
Do not wait for itching to decide. The CDC says it may take four to six weeks for itching to appear the first time a person has head lice, and that people with head lice may not have symptoms, particularly with a first infestation or when an infestation is light.
If a check turns up live lice, the CDC’s treatment guidance is the place to start. It says to treat when there is an active infestation, to use the lice medicine as directed on the box or label, and to check all household members and other close contacts, treating everyone infested, plus anyone they share a bed with, at the same time. Afterward, check the hair and remove nits and lice every 2 to 3 days for the next 2 to 3 weeks, and treat again only if live, crawling lice are seen several days later. Talk to a healthcare provider if you think re-treatment is necessary.
Water is not the only shortcut on the list. The CDC says there is no scientific evidence that suffocating head lice with mayonnaise, olive oil, margarine, butter or similar substances is an effective form of treatment, and the AAP says not to use home remedies such as petroleum jelly, mayonnaise, tub margarine, essential oils or olive oil, because no studies prove they work. Another pantry bottle has its own post, does vinegar kill head lice. Two cautions are worth keeping in view:
- Do not use fumigant sprays or fogs. The CDC says they are not necessary to control head lice and can be toxic if inhaled or absorbed through the skin.
- Never reach for gasoline, kerosene or medicines made for use on animals, which the AAP calls dangerous. The AAP also says never to let children apply lice medicine, and never to leave a child alone with medicine in their hair.
Frequently Asked Questions
Does ocean or salt water kill head lice?
Head lice can survive under water for several hours, the CDC says, and the treatments it describes are medications, over the counter or by prescription; the AAP calls head lice medicine the most effective way to treat head lice. A day in the surf is a good day and not a treatment, so handle an active case on its own schedule rather than hoping the ocean does the work.
Can a hot tub kill head lice?
The CDC’s heat figures apply to items you can soak or launder: hot water at 130 degrees Fahrenheit and high heat drying for laundry, and at least 130 degrees Fahrenheit for 5 to 10 minutes for combs and brushes. The CDC also says head lice can survive under water for several hours, and head-to-head contact is the route it warns about.
Does chlorine kill nits?
The CDC’s chlorine statement is about head lice: chlorine levels in pool water do not kill them. For eggs, the AAP says nits attach to the hair with a sticky substance that holds them firmly in place, and the CDC describes killing eggs as a job for medicine, since some medicines kill lice but not eggs.
Can lice live in pool water?
Not as a home. The CDC describes head lice as parasitic insects that live on the scalp, and says head lice do not survive long if they fall off a person and cannot feed. A louse in the water has lost its meal. What deserves a parent’s attention at a pool is contact between heads, not the water itself.
Can lice swim?
Lice crawl. The CDC says head lice move by crawling and cannot hop or fly, and its conclusion about pools is that spread there is unlikely. That is why a shared towel or a hug in the shallow end matters more than how long anyone is in the water.
Can you catch lice from a pool?
You can catch lice at a pool, from a person rather than from the water. The CDC says the risk of getting lice from a louse that has fallen onto a rug, carpet or furniture is very small, and a lounge chair is that kind of surface. Heads touching is what moves lice, so watch the huddles and the shared towels.
How Lice Lifters of Bucks County Can Help
A professional head check takes the question off your hands. If a swim day has left you squinting at the back of a neck in bad light, one careful look settles it faster than another night of guessing. At Lice Lifters of Bucks County we check the whole family, and the treatment is non-toxic and finished in one visit. Same-day appointments are available, and our 30 Day Guarantee applies when the whole family is checked. You can see how a visit works on our professional lice treatment page. When you are ready, book a head check for everyone who shares a pillow or a pool towel.
