If you live in Miami-Dade or Palm Beach County, you are currently in a county with an active mosquito-borne illness alert, and Broward sits directly between the two. As of August 20, 2026, mosquito health alerts are in effect across multiple Florida counties including Palm Beach and Miami-Dade (Source: WLRN, Aug 20, 2026). DOH-Miami-Dade issued its own mosquito-borne illness alert on August 3, 2026 (Source: Florida Department of Health in Miami-Dade County, Aug 3, 2026), after locally acquired dengue cases were confirmed in both Miami-Dade and Palm Beach (Source: WUSF, Aug 3, 2026). Broward's reported dengue cases this year have been travel-associated rather than locally acquired, but the same mosquito that spreads dengue breeds in Broward yards year-round.
I am not writing this to scare anyone. I've worked mosquito control in this market long enough to know the alerts come almost every August. What matters is understanding why, and what actually moves the needle on your own property.
Why now
South Florida doesn't really have an off-season. Miami-Dade, Broward, Palm Beach, and Monroe counties rarely get cold enough to knock mosquito breeding down to zero. But rainy season, mid-May through mid-October, is when populations spike, because the Aedes mosquitoes behind dengue and Zika breed on a fast cycle. Give them standing water and about 7 to 10 days, and you get a new generation ready to bite (Source: mosquitoshieldbfll.com, Are Mosquitoes Worse After Rain?). Stack a few rain events back to back, which is exactly what August does here, and the cycles overlap. That's why counties see upticks and alerts cluster in August specifically.
The mosquito species driving these dengue alerts, Aedes aegypti, is a container breeder. It does not need a swamp or a retention pond. A bottle cap of water sitting for a week is enough. That's a different animal than the floodwater mosquitoes most people picture, and it's why yard work matters more than most homeowners assume.
What to actually do
The Florida Department of Health's guidance holds up because it's simple and it works if you do it consistently, not once:
- Dump standing water weekly. Garbage can lids, gutters, buckets, pool covers, kiddie pools, plant saucers, pet bowls. Anything that holds water for more than a few days is a nursery.
- Check the yard, not just the house. Tarps, tire swings, boat covers, clogged downspouts. These get missed because they're not part of the daily routine.
- Wear repellent when you're outside at dawn or dusk. DEET, picaridin, oil of lemon eucalyptus, IR3535, or para-menthane-diol are the EPA-registered actives that actually work. Skip anything that doesn't list one of those.
- Cover up during peak biting hours. Long sleeves and pants sound basic, but Aedes aegypti bites aggressively during the day, not just at dusk, which surprises a lot of people.
Where professional treatment fits
Yard maintenance handles the water sources you can see and reach. It does not touch mosquitoes flying in from a neighbor's yard, a storm drain, or a vacant lot you don't control. That's the gap a barrier treatment is built for. A properly applied barrier spray knocks down adult mosquitoes on contact and holds up for roughly 10 to 17 days before it needs to be reapplied, which is why routine service is scheduled on that cycle rather than sprayed once and forgotten. It's worth being clear that the barrier product is not a natural product. It's an EPA-registered control product, and it works because it kills mosquitoes on contact, not because it's marketed as gentle.
Separately, some programs also use an In2Care-style device, which is a natural-based control tool mosquitoes carry back to breeding sites themselves rather than a spray. That's a different mechanism doing a different job. Neither one replaces the other, and neither one replaces dumping standing water in your own yard.
The bottom line
The alerts are real, they're active in Miami-Dade and Palm Beach right now with Broward sitting between them, and they track back to rain and standing water, not something exotic. Handle the water you control, use real repellent, and if you want the gaps you can't reach covered, that's what a barrier program does. None of this requires panic. It requires doing the boring stuff on a schedule.
Sources: WLRN, "A look at where mosquito health alerts are in effect across Florida," Aug 20, 2026; Florida Department of Health in Miami-Dade County, "DOH-Miami-Dade Issues Mosquito-Borne Illness Alert," Aug 3, 2026; WUSF, "Locally acquired cases of mosquito-borne dengue reported in Palm Beach, Miami-Dade," Aug 3, 2026.
Sources are cited inline. Questions about your own property? Call 561-443-3333 or request a free quote.