Dallas County is responsible for mosquito treatment in the City of Rowlett, including the portion of the City located in Rockwall County. Once a complaint has been reported an expert will survey the property looking for larva, adult mosquitoes, and standing water. If larva are found the source will be treated with larvacide. Dallas County can also place a trap out overnight to get a representative count on the adults and test the adults to determine if they are carrying disease. Currently, Dallas County is not spraying to exterminate adults unless a group of mosquitoes is found to be carrying a disease. For mosquito related service please submit a service request to the online Citizen Action Center, or call 972-412-6100.