Massive Marijuana Grow Removed from Sequoia National Park

The illegal marijuana cultivation site, discovered in 2024 and fully removed in August 2025, underscores the severe environmental consequences of illicit drug operations within national parks. The National Park Service (NPS) and the Bureau of Land Management (BLM) collaborated to dismantle the site, which had been raided previously but not fully cleared due to hazardous chemicals.

The operation involved diverting water from a nearby creek through irrigation lines and storing it in large pits, depriving local wildlife and vegetation of essential resources. Each marijuana plant can consume six to eight gallons of water per day, according to the California Department of Fish and Wildlife. The clearing of natural vegetation, digging of terraces, and construction of campsites further contributed to habitat destruction. Additionally, the presence of banned insecticides like Methamidophos poses a significant threat to water quality and the health of both animals and humans. Runoff from the site may have been contaminated by a variety of pesticides used in growing marijuana, potentially exposing both park visitors and wildlife to toxic materials.

The impacts extend far beyond the immediate 13-acre site, with nearly two miles of illegally maintained trails and evidence of poaching exacerbating the damage. The NPS estimates that nearly 300,000 plants, valued at approximately $850 million, have been eradicated from Sequoia and Kings Canyon National Parks over the past two decades, highlighting the scale and persistence of these operations.

The grow operation diverted water from creeks, cleared natural vegetation, created illegal trails, and introduced toxic chemicals into the environment.

Authorities found a semi-automatic pistol, makeshift campsites, and a banned insecticide called Methamidophos.

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