In July 2025, a headline spread fast across news sites and social media: a radioactive wasp nest had been found at a nuclear site in South Carolina. It sounds like the start of a 1950s monster movie, and plenty of people searched for “radioactive wasp” expecting stories of glowing, mutant insects.
For non-aggressive wasps I've had great luck spraying nests with this Spectracide wasp remover in the evening. For a nest up high in an eave, soffit, or tree, this Gotcha pole adapter clamps onto the can so you can spray from the end of an extension pole and treat the nest from 10+ feet away instead of standing right under it. And for anything aggressive I wear this ridiculous-looking upper torso beekeeping suit and keep my distance. It seems silly, but trust me, I learned the hard way.
The real story is less dramatic, but it’s a good lesson in how wasps build their nests. This guide covers what was found, how a wasp nest can pick up radioactive contamination, whether homeowners should worry, and what to do about the ordinary wasp nests you’re far more likely to find around your house.
The nest was found at the Savannah River Site (SRS), a large U.S. Department of Energy (DOE) facility near Aiken, South Carolina, along the Savannah River on the Georgia border. The site covers roughly 310 square miles. During the Cold War it produced materials for the nation’s nuclear weapons program, and today much of its work involves managing and cleaning up the waste from that era, including liquid radioactive waste stored in large underground tanks.
According to the DOE’s public reports and news coverage at the time:
Some local watchdog groups and members of the public questioned whether the initial explanation was detailed enough, and the incident led to wider discussion about long-term cleanup at former weapons sites. But the main facts weren’t disputed: a single, empty nest inside a secure nuclear facility picked up contamination from its surroundings, and it was found and removed through routine monitoring.
No. Wildlife and insects at nuclear facilities sometimes pick up contamination from the places they live and feed. At the Hanford Site in Washington State, another Cold War-era facility, workers have over the years found radioactively contaminated fruit flies, rabbit droppings, and other signs of wildlife that had come into contact with contaminated material. That’s one reason these sites monitor so routinely: animals can move small amounts of contamination around, and monitoring catches it.
The wasp nest made headlines because “radioactive wasp nest” is a memorable phrase. To radiation-protection staff, it’s the kind of finding their monitoring programs are designed to catch.
This is where wasp biology comes in. A wasp nest is built almost entirely from materials the wasps collect within a short distance of the nest site. So the nest is essentially a sample of the local environment.
Paper wasps, yellow jackets, and hornets build their nests from wood fiber. Workers scrape thin strips from weathered wood like fences, posts, dead branches, and siding. They chew the fiber with saliva into a pulp and spread it into the papery comb and envelope. They also collect water, both to work the pulp and to cool the nest on hot days. (We explain this process in detail in our guide to what wasp nests are made of.)
If the wood surfaces, puddles, or other water sources the wasps used held trace radioactive particles, those particles could end up in the nest. Because a nest is built from many trips’ worth of material, small amounts can accumulate in one place.
Solitary wasps like mud daubers and potter wasps build with mud. They collect wet soil from the edges of puddles, streams, and damp ground, then shape it into tubes or cells. Soil is one of the main places legacy contamination sits at older nuclear sites, so a mud nest built from contaminated soil would carry that contamination too. (See our mud wasp nest identification guide for what these nests look like.)
Wasps also feed their larvae insects, spiders, and other prey, and adult wasps drink nectar, honeydew, and other sugary liquids. In theory, prey that had picked up contamination could add a small amount to a nest. But building materials are a much more direct route, since they make up the nest itself.
It’s important to separate the nest from the wasps:
So the honest summary is: the wasps used contaminated building material, and the nest ended up contaminated. That’s a story about wasp nest construction, not about mutated insects.
For almost everyone, no.
Every material on Earth has tiny amounts of natural background radioactivity, including soil, wood, stone, and our own bodies. A wasp nest in your garage eaves has the same harmless background levels as the fence it was made from. For a nest to show meaningful contamination, the wasps need access to material that was already contaminated. Outside a few highly regulated nuclear facilities, that just doesn’t happen.
If you live near the Savannah River Site, a nuclear power plant, or another nuclear facility, it’s normal to wonder about this. A few points worth knowing:
There’s no reason for homeowners to test their own wasp nests with a radiation meter. Consumer meters aren’t designed for this kind of measurement, and any reading near a normal backyard nest would just reflect natural background levels.
The real danger from a wasp nest near your home is the same as always: stings. A defensive yellow jacket colony in your lawn or a paper wasp nest over your front door is a far more practical concern than radioactivity. Stings cause painful local reactions for most people. For people with venom allergies, they can cause life-threatening anaphylaxis. If you’ve been stung recently, our guide on what to do when you’re stung by a wasp walks through first aid and warning signs.
The SRS incident shows a few things that are useful to any homeowner dealing with wasps.
The nest was contaminated because wasps gather building material near the nest. The same habit explains why you see wasps scraping your deck rails, fence boards, or patio furniture. Those fine pale scratch marks on weathered wood are often paper wasps collecting pulp. Sealing or painting exposed wood makes it less attractive as building material, though it won’t by itself stop wasps from nesting nearby.
SRS workers found the nest during routine monitoring. At home, a quick walk around your house every week or two in spring is the best way to find nests while they’re still small. Check eaves, porch ceilings, window frames, sheds, play equipment, grill covers, and holes in the lawn. A nest found in April or May with only a queen on it is far easier to deal with than a summer colony of hundreds of workers. Learn what to look for in our guide to the start of a wasp nest.
Even in a nuclear facility, the basic approach to the nest was familiar: confirm what you’re dealing with, make sure no wasps are active, treat it with insecticide, then remove and dispose of it. For homeowners, the key steps are:
The SRS nest was handled by trained radiological workers because of where it was. Ordinary nests sometimes need professional help too. Call a licensed pest control professional if:
According to the Department of Energy, no. The nest was inside a controlled area of the Savannah River Site, no contamination was found in the surrounding area, and the nest was removed and disposed of as radioactive waste. Officials said it posed no risk to the public or the environment.
At the Savannah River Site, a Department of Energy nuclear facility near Aiken, South Carolina. It was found in July 2025 on a post near the site’s radioactive waste storage tanks.
No wasps were reported on the nest when it was found. Any wasps that had used it may have had trace contamination from the same material, but there’s no evidence that radioactive wasps were flying beyond the site, and contamination doesn’t make wasps larger or more aggressive.
Wasps build nests from materials they collect nearby: wood fiber and water for paper nests, mud for mud dauber nests. The DOE attributed the contamination to legacy radioactive material already present at the site, which the wasps likely picked up while gathering building material or water.
Not in any meaningful way. All natural materials have tiny amounts of background radioactivity, and a backyard wasp nest is no different from the wood or soil it was made from. Measurable contamination requires access to contaminated material, which is controlled at regulated nuclear facilities.
No. Radiation doesn’t create giant or super-aggressive insects. High doses can sterilize or kill insects, and insects tolerate radiation much better than people do. Wasp aggression comes from defending the nest, late-season food stress, and disturbance, not radiation. Our guide on why wasps become aggressive explains the real triggers.
No. There’s no reason for homeowners to test wasp nests. If you live near a nuclear facility and have concerns about environmental contamination, the facility’s annual environmental monitoring report and your state’s radiation-control agency are the right places to get reliable information.
The radioactive wasp nest at South Carolina’s Savannah River Site was real, but it isn’t a reason to fear wasps. Wasps built a nest from nearby materials, and in a place with legacy contamination, those materials carried trace radioactivity. Routine monitoring found it, and workers removed it safely.
For homeowners, the takeaway is practical. Wasps build with whatever is close at hand, nests are easiest to deal with when found early, and the real hazard from any wasp nest is stings, not radiation. Identify the nest, check whether it’s active, treat it carefully or call a professional, and you’ll have handled it the same basic way the experts did.
This article is for general educational purposes. Details of the Savannah River Site incident are based on public statements from the U.S. Department of Energy and news reports at the time. For questions about environmental radiation near your home, contact your state’s radiation-control or environmental health agency.