Last year, eight cases of the mosquito-borne disease were confirmed in the state.
All but one of the cases in Arizona were in Maricopa County. So far, no cases have been confirmed in Pima County.
Officials with the Pima County Health Department say the county has an active program to treat standing water to kill mosquitos. They also say despite all the rain, the county has not had the need to fog for mosquitos this year.
The CDC report highlights a marked increase in cases of the disease across the country, with Texas having the largest number.