South Florida Yard Audit

This is the #1 overlooked mosquito source in South Florida. The overlapping leaves of bromeliad plants form natural tanks that hold rainwater for weeks. Aedes aegypti — the species that carries dengue and Zika — specifically seeks out bromeliad tanks to lay eggs. A single large bromeliad can breed hundreds of mosquitoes per rain cycle.

Fill each bromeliad tank with a small amount of horticultural sand or apply Mosquito Bits (Bacillus thuringiensis israelensis, safe for plants and humans). Do not simply drain — eggs remain viable on damp surfaces and will hatch with the next rain. Treat every 2–3 weeks during rainy season.

Any bromeliad, tillandsia, or pineapple plant on your property. Check the center rosette and the base of each leaf.

Your air conditioning unit continuously produces condensation, which drains outside through a PVC line. In South Florida's humidity, this creates a constant slow drip — and wherever that drip pools (a clogged drain pan, a depression in the ground, a clogged line) becomes a year-round breeding site that isn't dependent on rain.

Check the AC drain pan under your air handler — it should be dry or draining freely. Outside, verify the condensate line drains completely away from the building and doesn't pool. Pour a cup of bleach down the line monthly to prevent algae clogs. Consider a condensate pump if your line drains to a low spot.

The PVC pipe exiting your home near the AC unit. The drain pan under your indoor air handler. Any wet patch near the AC exterior.

A single clogged section of gutter holds several gallons of standing water after every rain. The debris layer — leaves, seeds, dirt — creates a rich organic substrate that accelerates larval development. Gutters are also elevated, which makes them harder to treat and easier to overlook. South Florida's heavy rainy season means constantly refilling.

Clean gutters at minimum twice per year in South Florida — once before rainy season (April) and once after (November). Install gutter guards if leaf buildup is a chronic problem. After any significant storm, check that gutters are flowing freely by running a hose from your roof.

Standing water or debris visible from the roofline. Gutters that overflow during rain instead of draining to downspouts.

Every outdoor pot with a saucer underneath is a mosquito breeding tray. In South Florida's daily summer rain pattern, saucers refill faster than they evaporate — creating a reliable, shallow water source that's exactly what Aedes mosquitoes prefer. If you have 20 pots on a lanai, you have 20 breeding sites.

Remove all saucers from outdoor pots, or drill drainage holes in them so they don't hold water. For pots you want to protect flooring, empty saucers within 24 hours after rain. On covered patios or lanais, check every saucer after each rain event.

Under every outdoor plant. Underneath hanging basket hooks that catch drips. Decorative pots without drainage holes.

A pool itself won't breed mosquitoes — chlorine prevents it. But the top surface of a solid pool cover absolutely will. After a South Florida rainstorm, solid covers pool 20–100 gallons of standing water on their surface. This is warm, still, and shallow — perfect conditions. Most homeowners never think to check the top of their pool cover.

After every significant rain, use a cover pump or tilt the cover to drain standing water off the surface. If your cover consistently pools water due to sagging, add a support column underneath to create a pitch. Consider a mesh safety cover (water passes through, no pooling) if you're replacing your cover.

The surface of any solid pool cover after rain. Depressions or sags where water pools.

Buckets, wagons, sandbox toys, wheelbarrows, empty plant pots — anything with a concave surface left outdoors will collect rainwater. This category is easy to overlook because the items are small individually, but collectively they can represent a dozen+ breeding sites scattered around your yard. Aedes mosquitoes prefer small, discrete water sources over large open ones.

After each use or rain, tip everything upside down. Store loose items under a covered area or in a garage. For sandboxes, use a fitted cover and check for water pooling on the cover. Keep any buckets or containers stored inverted.

Sandbox, play structures, flower pots without plants, buckets, wagons, wheelbarrows, tarps or debris on the lawn.

Moving water doesn't breed mosquitoes — still water does. A fountain or birdbath that's turned off (or whose pump has failed) becomes a standing-water breeding site within 3–5 days. The decorative stone, ceramic, or concrete surfaces of these features also retain organic material that supports larval development.

Run fountain and birdbath pumps continuously. If the pump fails, treat the water with Mosquito Dunks (BTI pellets — kills larvae, safe for birds and fish) until the pump is repaired or replaced. Change birdbath water every 3–4 days if you prefer no chemical treatment. Remove birdbaths you're no longer actively maintaining.

Any water feature that's turned off. Birdbaths. Decorative ponds without fish or aeration. Koi ponds are usually fine if fish are actively feeding.

Tarps develop folds and depressions that hold rain water in dozens of spots simultaneously. A single boat tarp after a South Florida thunderstorm can hold 50+ individual puddles. Boats stored on trailers often have areas where water accumulates in the hull, bilge area, or equipment stored aboard.

Pitch tarps with a support underneath so water sheds off rather than pooling. After significant rain, walk tarps and push water off depressions. For boats, ensure drain plugs are removed when stored, and check for standing water in any compartment. Old tires are among the worst offenders — remove them from your property entirely.

Any tarp on lawn equipment, boats, or stored items. Boat trailers. Areas under dock lifts. Stored tires.

Irrigation systems that overwater, broken heads, or low spots in the lawn create persistent moisture and standing puddles. South Florida's clay-heavy soil in some areas drains slowly, meaning a daily irrigation cycle in the rainy season is actively creating breeding sites that your service can't fully overcome. This is especially common in side yards and behind HVAC equipment.

Walk your property during or immediately after irrigation to identify heads that are puddling rather than draining. Adjust irrigation schedules — in rainy season (June–September) you often need zero supplemental irrigation for lawn areas. Have a landscaper grade any persistent low spots that don't drain within a few hours of rain.

Puddles that persist 4+ hours after rain or irrigation. Soggy spots in the lawn that don't dry out between waterings. Irrigation heads aimed at fences, walls, or paved areas.