Spring Valley & La Presa Residents should report mosquito activity or stagnant water sources including green swimming pools and other mosquito breeding sources, as well as dead birds (crows, ravens, hawks & owls) to the County Vector Control Program at 858-694-2888 or emailing

Female mosquitoes lay their eggs in standing water sources. When the eggs hatch, they become mosquito larvae. Larvae can mature into biting adult mosquitoes in as few as 5 days. Under ideal conditions, mosquitoes can complete their life cycle from egg to adult in as few as 7 days.

(Photo: County of San Diego)