US (CA): Cannabis farms irrigating with groundwater may affect stream flows, study shows

Like any plant, cannabis requires water to grow. A new study from the Cannabis Research Center at UC Berkeley examined where cannabis growers in California are getting water for their crops, highlighting significant gaps in cannabis cultivation policy.

Environmental advocates have expressed concern that cannabis farms are diverting water from rivers and streams, which could harm fish and other wildlife. The researchers studied water use in 11 of the state’s top cannabis-producing counties – Humboldt, Lake, Mendocino, Monterey, Nevada, San Luis Obispo, Santa Barbara, Santa Cruz, Sonoma, Trinity, and Yolo.

Using California state cannabis permitting data, the researchers found that cannabis farms rely primarily on groundwater wells, not streams, for their irrigation needs. But pumping groundwater could also have an undesirable effect on wildlife.

“Wells drilled near streams in upland watersheds have the potential to cause rapid streamflow depletion similar to direct surface water diversions,” said co-author Ted Grantham, UC Cooperative Extension specialist and co-director of the Cannabis Research Center.

Read more at californiaagtoday.com


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