New policy sets rules for marijuana growers to protect California water:

On October 17, the California State Water Resources Control Board adopted new environmental policies to regulate how marijuana growing operations will impact California’s already limited water resources. The new regulations are in response to voters’ approval of Proposition 64 in 2016 to legalize recreational marijuana.  Cannabis cultivation can impact local water by reducing flows in streams and creeks or polluting waterways with pesticides and other agricultural chemicals. Even the construction of roads and buildings for cannabis farming causes sediment runoff and erosion that damages nearby streams and rivers. Until recently, this was difficult to address because many growing operations were illegal. ... ”

Read more from Water Deeply here:  New policy sets rules for marijuana growers to protect California water