Estimates from ONDCP, HITDA, Don Hoang (Forest Service Special Agent in Charge of the Pacific SW Region), Dr. Mourad Gabriel (Co-Director at the Integral Ecology Research Center), Tommy Lannier (Director of the National Marijuana Initiative)
 Ferrell, David L. 2016. Issue: Marijuana Cultivation on National Forest System and other public lands, environmental effects, and cooperative activities. US Forest Service Report to Congress. Washington, D.C., USA.
 Law enforcement statistics based on eradications
 Hoang, Don. 2019. Illegal Marijuana Production and Environmental Impact to National Forest System Lands. US Forest Service Publication 5300, Washington, D.C., USA.
 Integral Ecology Research Center trespass grow test results and first-hand reclamations
 Gabriel, M. W., L. V. Diller, J. P. Dumbacher, G. M. Wengert, J. M. Higley, R. H. Poppenga, and S. Mendia. 2018. Exposure to rodenticides in Northern Spotted and Barred Owls on remote forest lands in northwestern California: evidence of food web contamination. Avian Conservation and Ecology 13(1):2.
 M.W. Gabriel, L.W. Woods, R. Poppenga, R.A. Sweitzer, C. Thompson, S.M. Matthews, J.M. Higley, S.M. Keller, K. Purcell, R.H. Barrett, G.M. Wengert, B.N. Sacks, D.L. Clifford, (2012). Anticoagulant rodenticides on our public and community lands: Spatial distribution of exposure and poisoning of a rare forest carnivore. PLoS ONE. 2012 Jul 13; 7(7):e40163.
 California Department of Pesticide Regulation. 2018. An Investigation of anticoagulant rodenticide data submitted to the Department of Pesticide Regulation. California Department of Pesticide Regulation, Sacramento, CA, USA.
 Bauer, S., J. Olson, A. Cockrill, M. van Hattem, L. Miller, M. Tauzer, G. Leppig. 2015. Impacts of Surface Water Diversions for Marijuana Cultivation on Aquatic Habitat in Four Northwestern California Watersheds. PLOS ONE 10(9): e0137935.
 Hendron, J. 2017. Illegal Marijuana Sites: A stain on Public Lands. US Fish & Wildlife Service newsroom. <https://www.fws.gov/cno/newsroom/featured/2017/illegal_marijuana_sites>. Accessed 24 May 2019.
 Basic calculation based on law enforcement estimates of number of plants removed, and water requirements per plant per growing season
 Estimates from IERC trespass grow GIS modelling and analysis