The Orange County Vector Control District (OCVCD) is 1 of over 100 agencies statewide specifically dedicated to protecting public health by controlling rats, flies, mosquitoes, fire ants and other vector related problems. The OCVCD provides service to all of Orange County or 798 square miles. The OCVCD conducts regular surveillance for vectors and vector-borne diseases that can make the public ill or be a nuisance to the public. While the District conducts regular surveillance and control measures, homeowners can also protect themselves from vectors.