CIRS Blog about Rural California
Marijuana is the top cash crop in California and nationwide. In 2005, the U.S. Deptartment of Agriculture found that the average production value of marijuana—more than $30 billion—far exceeded the value of corn or soybeans. More recent numbers indicate that the value of marijuana exceeds the combined value of corn and soybeans, but these market estimates vary widely.
Marijuana is an exceptionally water-loving crop. A pilot study by the California Department of Fish and Wildlife (CDFW) found that concentrated marijuana cultivation has the potential to completely dewater streams and other sources of water (e.g. mountain seeps and springs). The most common method for securing water for growing cannabis is siting grow operations in locations with reliable year-round water sources to draw upon. It is no coincidence that the so-called “Emerald Triangle”—the most productive region for cannabis in the country—is located in the part of California that receives the most average rainfall. In regions with less water and/or during recent drought years when precipitation levels dropped, CDFW also documented the groundwater use for grow operations and importing water by truck.
These findings are significant, particularly during the third year of California’s historic drought. Despite a statewide law that allows for the legal cultivation, sale, and use of marijuana, illegal grow operations have proliferated especially in the past two decades. Every year, California authorities receive complaints about marijuana on public lands, often involving armed trespassers who divert water from local sources. Many of these operations are secretly set up in protected wilderness areas that provide limited habitat for vulnerable species, like salmonids and fishers. In addition to high-volume water use, chemical fertilizers and rodenticides have impacted local and downstream water resources as well as wildlife.