Prevent Mosquitoes In Drainage Systems

When water reaches a certain level in the sump
pump basin, the float rises, switching on the pump. Water that is below the threshold level will not trigger the pump, even this small amount of water will sit in the basin and can attract mosquitoes. 

Large openings create easy access for mosquitoes
to access water inside sump pumps. Cover holes
with fine mesh screen to keep mosquitoes out.

Prevent larvae from developing inside the basin, and control larvae that have already hatched by treating with a bacterial larvicide containing Bti.

Clean out leaves and other debris in gutters
regularly. Flush the pipes after cleaning. Downspout extenders can also retain water —remove them or tip out any remaining water after it rains. 

Lawn drains, French drains (a very common sources of mosquito breeding), and other drains and pipes can retain water.  You can use a fine mesh screen under the drain cover to prevent mosquitoes from entering. Just makes sure to check regularly and clear debris. You can also flush drains regularly and treat standing water with a bacterial larvicide according to the label.

Helpful tip! Use a flashlight to check drains—a reflection means there is pooled water. Use the advice above to prevent mosquito breeding.  

Cleanout access above the septic tank should be sealed and watertight. Makeshift lids, cracked PVC caps or broken/cracked concrete lids should be replaced and edges should be sealed tightly. Mosquitoes can slip through even small cracks. 

Any saturated/wet ground because of drain field failure will act as a mosquito breeding ground and should be treated immediately with a bacterial larvicide containing Bti.

Ventilation pipes should be securely covered with screening. Observation pipes should be capped
with a removable cap. Form the screen into a cone
if the vent pipe is below or near a tree.