Jim Wilson/The New York Times
Marijuana crops on private land in Humboldt County, Calif. Some medical marijuana growers follow state rules, but others do not.
ARCATA, Calif. — It took the death of a small, rare member of the weasel family to focus the attention of Northern California’s marijuana-growers on the impact that their huge and expanding activities were having on the environment.
The animal, a Pacific fisher, had been poisoned by an anticoagulant in rat poisons like d-Con. Since then, six other poisoned fishers have been found. Two endangered spotted owls tested positive. Mourad W. Gabriel, a scientist at the University of California, Davis, concluded that the contamination began when marijuana growers in deep forests spread d-Con to protect their plants from wood rats.
That news has helped growers acknowledge, reluctantly, what their antagonists in law enforcement have long maintained: like industrial logging before it, the booming business of marijuana is a threat to forests whose looming dark redwoods preside over vibrant ecosystems.
Hilltops have been leveled to make room for the crop. Bulldozers start landslides on erosion-prone mountainsides. Road and dam construction clogs some streams with dislodged soil. Others are bled dry by diversions. Little water is left for salmon whose populations have been decimated by logging.
And local and state jurisdictions’ ability to deal with the problem has been hobbled by, among other things, the drug’s murky legal status. It is approved by the state for medical uses but still illegal under federal law, leading to a patchwork of growers. Some operate within state rules, while others operate totally outside the law.
The environmental damage may not be as extensive as that caused by the 19th-century diking of the Humboldt estuary here, or 20th-century clear-cut logging, but the romantic outlaw drug has become a destructive juggernaut, experts agree.
“In my career I’ve never seen anything like this,” said Stormer Feiler, a scientist with California’s North Coast Regional Water Quality Control Board. “Since 2007 the amount of unregulated activities has exploded.” He added, “They are grading the mountaintops now, so it affects the whole watershed below.”
Scott Bauer, of the state Department of Fish and Wildlife, said, “I went out on a site yesterday where there was an active water diversion providing water to 15 different groups of people or individuals,” many of them growers. “The stream is going to dry up this year.”
While it is hard to find data on such an industry, Anthony Silvaggio, a sociology lecturer at Humboldt State University, pointed to anecdotal evidence in a Google Earth virtual “flyover” he made of the industrial farm plots and the damage they cause. The video was later enhanced and distributed by Mother Jones magazine.
Brad Job’s territory as a federal Bureau of Land Management officer includes public lands favored, he said, by Mexican drug cartels whose environmental practices are the most destructive. “The watershed was already lying on the ground bleeding,” Mr. Job said. “The people who divert water in the summer are kicking it in the stomach.”
That water is crucial to restoring local runs of imperiled Coho salmon, Chinook salmon and steelhead, which swam up Eel River tributaries by the tens of thousands before the logging era. Scott Greacen, executive director of Friends of the Eel River, said, “It’s not weed that drove the Coho to the brink of extinction, but it may kick it over the edge.” By various estimates, each plant needs at least one gallon and as much as six gallons of water during a season.
The idea that the counterculture’s crop of choice is a bad for the environment has gone down hard here. Marijuana is an economic staple, particularly in Humboldt County’s rural southern end, called SoHum. Jennifer Budwig, the vice president of a local bank, estimated last year that marijuana infused more than $415 million into the county’s annual economic activity, one-quarter of the total.
For the professed hippies who moved here decades ago, marijuana farming combines defiance of society’s strictures, shared communal values and a steady income. “Marijuana has had a framework that started in the 1930s with jazz musicians,” said Gregg Gold, a psychology professor at Humboldt State University. “It’s a cultural icon of resistance to authority.”
“In 2013,” he added, “you’re asking that we reframe it in people’s minds as just another agribusiness. That’s a huge shift.”
It is a thriving agribusiness. Derek Roy, a special agent enforcing endangered species protections for the National Marine Fisheries Service, said, “These grow sites continue to get larger and larger.” Things took off after 1996, when California decriminalized the use of medical marijuana, Mr. Roy said.
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