Google wants to release up to 176 million mosquitoes in three states.

But before anyone reaches for a flyswatter, there's an important detail: none of them are supposed to bite.

The mosquitoes are all male and are part of an ambitious plan to suppress disease-carrying mosquito populations using a naturally occurring bacterium called Wolbachia. The proposal has generated hundreds of public comments, widespread media attention, and enough confusion that the U.S. Environmental Protection Agency recently issued a public statement clarifying that no releases have yet been approved.

Through two separate applications currently under review by the EPA, Google LLC is seeking permission to release specially treated mosquitoes in California, Florida, and New Jersey. If approved and fully implemented, the combined programs could involve as many as 176 million mosquito releases over the next several years.

The proposal represents one of the most ambitious mosquitosuppression efforts ever pursued by a technology company and highlights a growing concern among public health officials: Controlling diseasecarrying mosquitoes is becoming increasingly difficult.

Two Permits, Two Mosquitoes

Much of the media coverage has treated Google's proposal as a single project. In reality, the EPAis reviewing two separate applications targeting two very different mosquito species.

The public comment period for the first application, docket EPA-HQOPP-2025-4216, closed on May 20, 2026. It seeks permission to release male Asian Tiger Mosquitoes (Aedes albopictus) carrying a Wolbachia strain known as wPip.

Originally native to Southeast Asia, Aedes albopictus arrived in the United States during the 1980s and has since spread across much of the eastern United States, the Gulf Coast, and portions of California. It is considered one of the most invasive mosquitoes in the country and is notorious for aggressively biting people during daylight hours.

Public health officials are particularly concerned about this species because it is capable of transmitting dengue, chikungunya, Zika, and several other mosquitoborne diseases. Although large outbreaks remain uncommon in most of the United States, the mosquito's continued expansion has drawn increasing attention from mosquitocontrol agencies. Under Google's proposal, up to 16 million mosquitoes would be released in New Jersey during 2026. If approved, the program would expand in 2027 and 2028 to include California and Florida, with up to 16 million mosquitoes released annually in each state.

That permit alone could involve as many as 112 million mosquito releases over three years.

The public comment period for the second application, docket EPA-HQ-OPP-2025-3951, closed on June 5, 2026. It targets Culex quinquefasciatus, commonly known as the Southern House Mosquito.

Unlike the Asian Tiger Mosquito, which actively hunts people during the day, Southern House Mosquitoes are generally most active around dusk and nighttime. They are commonly associated with urban environments, storm drains, catch basins, wastewater systems, neglected swimming pools, and other stagnant-water habitats.

They are among the primary carriers of West Nile virus and St. Louis encephalitis in many parts of the United States.

Google is seeking permission to release up to 16 million male Southern House Mosquitoes annually in both California and Florida over a twoyear period. If fully implemented, that permit could involve another 64 million mosquito releases.

The Science

While the numbers sound enormous, the science itself is not new.

The mosquitoes are infected with Wolbachia, a bacterium naturally found in many insect species. Scientists estimate that more than half of all insect species on Earth carry some form of Wolbachia.

When a Wolbachia-infected male mates with a female that does not carry the same Wolbachia strain, the resulting eggs fail to hatch. If the female already carries the same Wolbachia strain, however, the eggs develop normally.

No pesticides are sprayed. No genetic modification is involved in the current applications.

Instead, the mosquitoes carry what amounts to a form of biological birth control.

The released males do not bite because male mosquitoes feed primarily on plant sugars rather than blood. Their only job is to locate wild females and mate.

If enough Wolbachia-carrying males are present, mosquito populations can decline significantly because fewer viable offspring are produced.

The concept has been studied for years and has already been tested in several locations around the world. Google's contribution is not the bacterium itself but rather automation.

Through its Debug Project, which originated within Alphabet's Verily life sciences division around 2016, Google developed automated systems capable of breeding, sorting, packaging, and distributing mosquitoes at industrial scale. Machine vision, robotics, and automated sorting systems are used to separate males from females before release.

The long-term goal appears to be creating a scalable mosquitosuppression platform that can be deployed over large geographic areas.

Not Everyone Is Convinced

The EPA determined that both applications may be of regional and national significance and opened them to public comment.

Many commenters expressed concerns about unintended ecological consequences, the possibility of accidental female releases, and the long-term effects of suppressing mosquito populations.

One commenter wrote, 'Please do not allow this. Do they even know how they would react once in the wild with other mosquitoes? I understand that they are supposed to not be able to reproduce, but we know nature finds a way.'

Another questioned Google's automated sorting system, writing, 'We were not provided with any information on how reliable it will be at sorting the males from females.'

Supporters counter that Wolbachiabased suppression programs have been studied extensively and that the EPA's review process is specifically designed to evaluate environmental and public-health risks before any releases occur.

What Happens Next?

As of press time, the EPA had not indicated whether it intends to approve either permit. But the agency's eventual decision will help determine whether Google's decadelong effort to automate mosquito suppression remains an experiment — or becomes the foundation of a new commercial approach to mosquito control.