Keeping mosquitoes out of a rain tote
A tote of still water is a mosquito nursery unless every opening is screened. Fine mesh on the cap, the vent and the overflow, a closed valve and a regular turnover keep a rain tote from becoming one.
Last reviewed November 11, 2026
Where they get in
Mosquitoes lay eggs on or just above the waterline of still containers. Any gap large enough for a mosquito is a door: the fill cap, the vent, the overflow pipe, a loose gasket, the top of the downspout. A tote with one unscreened opening is an unscreened tote.
- Fill cap: fit a mesh screen under the lid or use a fine-mesh basket.
- Vent: cover with mesh, held with a clamp.
- Overflow: end the pipe in mesh, not an open mouth.
- Downspout: add a leaf screen and a mesh sock.
Why South Florida makes it worse
Warm weather, humidity and frequent rain speed the mosquito life cycle. Miami-Dade's peak breeding season is in the wet months, and local reporting notes the county's mosquito control works year-round to keep up. A tote left open through June is a hatchery by July.
What not to do
Do not rely on a floating oil or a bleach splash in a tote you plan to use on plants. Do not leave a lid ajar. Do not store water in a cracked bottle. If you cannot screen it, empty it.
Checking weekly
Every week in the wet season, look at the screens, shake the cap, look at the overflow and check the waterline for wigglers. A weekly check takes a minute. Fix gaps the same day.
A routine that holds up
Pick a weekday, put it in your phone and walk the yard. Check every tote, bucket, saucer, tarp fold and gutter, since mosquitoes do not only use totes. Tip out anything that holds water. In the tote, look at the screens, then the cap, then the waterline for wigglers. A routine that takes ten minutes stops most problems at the larva stage, long before anyone is bitten.
Questions people ask
What do wigglers look like?
Tiny dark larvae that jerk through the water and rise to breathe at the surface.
How often should I empty a tote?
Use the water regularly. Standing for weeks invites trouble.
How fine should the mesh be?
Fine enough that a mosquito cannot pass, the kind sold as insect screen.
Can I use a plastic bag over the cap?
No. It tears and traps water on top.
Do fish help?
Not in a covered utility tote.
What about the overflow?
It needs mesh too.
Who do I tell about breeding?
County mosquito control.
Ask for screened totes
Say how many and what size.