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What Is DEET? Is It Safe for You and the Environment?

DEET is one of the most effective and common flea, tick, and mosquito repellents in the world. The active ingredient in about 120 commercially available products, it is considered safe for humans and the environment by the World Health Organization (WHO), the Environmental Protection Agency (EPA), and the Centers for Disease Control and Prevention (CDC). Despite its robust credentials, many people retain a strong buzz of concern about DEET.

How Does DEET Work?

A commonly cited 2019 study from researchers at Johns Hopkins University and Virginia Polytechnic Institute suggests that DEET changes the scent of human sweat and either makes humans smell noxious to mosquitoes and ticks or makes people harder for them to find. However, not enough is known about how mosquitoes and ticks process odors to understand precisely how the chemical repels them.

The National Pesticide Information Center says that about 30% of Americans use some formulation of DEET. They find it in various brand-name products at concentrations varying from 4% to 100%. The concentration percentage forecasts not how well a product will work but how long its effect will last.

Interested in learning more? Head here for more information on DEET in repellents, written by Rebecca Coffey.


May 6, 2022

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My only complaint is that eventually, backflushing won’t be enough. These can clog up after some time and no amount of back flushing will fix its low flow. I went through 2 on the AT. However, it will attach to Smart Water Bottles and most bladders!

Anna Hamrick


Built for backcountry reliability and portability, the Sawyer Squeeze filter is our pick for the best portable water purifier.

Pete Ortiz


The Sawyer Squeeze was (by far) the most common Pacific Crest Trail water filter this year – for the fifth year in a row. It’s a $39, 3 oz / 85 g hollow fiber filter that rids your drinking water of protozoa and bacteria (and floaties). It can be used with Sawyer bags (included with the filter) or with compatible water bottles (Smartwater is the bottle of choice for many hikers).

Halfway Anywhere
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