Pest Library
West Nile season in Salt Lake County: a homeowner's checklist
2026 has been a heavy West Nile year in Salt Lake County. Here's what the numbers mean for your yard, and a simple weekly routine that cuts the bites.
By Alvin Fairbanks, Pest Control Guides Editor
Updated September 2026 4 min read
Short answer
West Nile activity in 2026 has run about six times higher than 2025 by the same point. The mosquitoes that carry it breed in standing water that sits for about a week, so the most effective thing a homeowner can do is empty water weekly, clean gutters and use repellent from dusk to dawn. Yard treatments help around resting areas; the abatement districts handle wetlands.
What the numbers say
Mosquito samples are tested all summer, and positive pools show where the virus is circulating. When positives run far above normal, the chance of human cases goes up too.
Most people infected never feel sick, and some get a fever. A small share develop serious illness, which is why reducing bites matters, especially for older adults.
In 2026 the Salt Lake County Health Department reported 709 West Nile positive mosquito samples statewide, against 108 at the same point in 2025, about six times normal, with 35 percent of one weekly Salt Lake City sample testing positive. Salt Lake County has three mosquito abatement districts, Magna, Salt Lake City and South Salt Lake Valley, and the season runs until the first hard freeze. Utah's first human case of 2025 was likely infected near the Jordan River in the southern half of the county.
Where yard mosquitoes breed
Any container that holds water for about a week can produce mosquitoes. The usual suspects are small and easy to miss.
- Flower pot saucers and buckets
- Clogged gutters and downspout extensions
- Tarps, pool covers and toys
- Bird baths and pet bowls
- Low spots in the lawn that stay puddled
A weekly routine
Pick one day a week to walk the yard. Tip out containers, refresh bird baths, check gutters after storms and turn over anything that collects rain. Ten minutes a week does more than any spray.
Protecting your family
Use an EPA-registered repellent when outside from dusk to dawn, when West Nile mosquitoes bite most. Long sleeves help, and so do intact window screens and a fan on the patio, since mosquitoes are weak fliers.
Yard treatment and the abatement districts
The county's abatement districts treat wetlands, canals and larger breeding sites. A yard treatment covers the shaded shrubs and fence lines on your own lot where adult mosquitoes rest during the day. The two together, plus your weekly routine, make evenings outside noticeably better.
Sources
Mosquito season runs until the first hard freeze.
Mostly from dusk to dawn.
In about a week, which is why a weekly routine works.
It reduces mosquitoes resting on your lot, but repellent and draining water still matter.
The county mosquito abatement districts.
If you develop fever, severe headache or other illness after bites, contact your medical provider.
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