Pyrethroids have been extensively researched to ensure there is no harm to the environment. In fact, pyrethroids were adopted and embraced by regulators as a more environmentally-friendly option to replace organophosphates. Pyrethroids have been reviewed and approved for use by many government regulatory agencies around the world, including the US EPA and EU regulatory authorities. The use of pyrethroids has been approved in nearly 80 countries globally.
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As is the case with all pesticides, the United States Environmental Protection Agency (EPA) regulates pyrethroids in accordance with its mission to protect human health and the environment.
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The EPA sets national standards and state regulators set state standards for all pesticides based on the best scientific information available to encourage the proper use of pesticides and to protect human health and the environment.
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The EPA has its own extensive processes in place to continuously review existing registrations and incorporate the most current science.  In conjunction with these efforts, the manufacturers of pyrethroids have conducted numerous studies over the past three decades to continuously assess the potential environmental impacts of pyrethroids.