Cannabis is the most highly regulated crop in California, and the state just added another layer of regulation. This article breaks down the State Water Resources Control Board’s (SWRCB) recently updated Cannabis Cultivation Policy – Principles and Guidelines for Cannabis Cultivation (“Policy”) into six key takeaways. These guidelines impose new rules on cannabis cultivation activities that have the potential to impact a watercourse (stream, creek, river or lake). Most of these rules apply to cultivation of sun-grown cannabis, which is currently allowed in some form in 12 counties. Compliance with these new requirements will be implemented through the CalCannabis Cultivation Licensing Program.