WEAVERVILLE, Calif. (Reuters) - Pollution from illegal marijuana farms deep in California's national forests is far worse than previously thought, and has turned thousands of acres into waste dumps so toxic that simply touching plants has landed law enforcement officers in the hospital.
The volume of banned or restricted pesticides and illegally applied fertilizers in the woods dwarfs estimates by the U.S. Forest Service in 2014, when a top enforcement official testified that the pollution was threatening forest land in California and other states.
Growers use fertilizers and pesticides long restricted or banned in the United States, including carbofuran and zinc phosphide. In previous years, it was commonly sold fertilizers and pesticides that were used illegally, law enforcement officials said.
Exposure to the pesticides has sent at least five law enforcement officials and two suspects to hospitals with skin rashes, respiratory problems and other symptoms, court documents and state data show.
Federal prosecutors have also charged pot growers with environmental crimes in Alaska, Oregon and Washington.
The most toxic sites cost as much as $100,000 to clean up, leaving taxpayers with a bill that could reach $100 million or more in California alone.
Use of toxics has grown over the past three to four years, and chemicals have been found at sites in Oregon and Washington as well, said Chris Boehm, the Forest Service's assistant director for enforcement and investigation. "In the last couple years we've lost a lot of the ground we had picked up in eradicating and cleaning up the new sites we find."
The expense and danger of cleanup has created a backlog of 639 illegal marijuana farms awaiting restoration in California, according to U.S. Forest Service data compiled for Reuters. Each farm covers up to 50 acres.
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