 This study uses a geographic information system and analytical hierarchy process to develop an environmental impact susceptibility model for landfills in California, USA. The model considers 13 associated environmental indicators and indicates that more than 75% of the state's territory is in low or medium categories. However, 61 landfills are located in high or very high categories, which received approximately 57% of all solid waste disposed in California from 2000 to 2015. The results can be used to mitigate the environmental impacts of these facilities. This article was authored by Victor Fernandez-Nashimento, Nazli Yesila, Keith C. Clark, and others.