A. The U.S. Environmental Protection Agency (EPA) considers the majority of agrochemicals (e.g., herbicides, fungicides, and insecticides) to be harmless. b. California is the number one agricultural state in the U.S, accounts for 55% of the nation's farm production and is highly dependent on irrigation. c. Excessive water supply to crops may increase their yield but reduces flavor and vitamin C content and may increase soil salinization in the long-run. d. According to the EPA, agriculture is the largest nonpoint source of water pollution in North America.