Even in relatively dry states like Arizona, irrigation systems and surrounding lakes, as well as stagnant puddles, ponds, and pools create breeding grounds for mosquitoes.
Of the 176 species of mosquitoes in the United States, the following are found in Arizona: Asian Tiger Mosquito, Western Encephalitis Mosquito, Southern House Mosquito, Dark Rice Field Mosquito, Yellow Fever Mosquito, Western Malaria Mosquito, and Inland Floodwater Mosquito