​Arizona summers already ask a lot from homeowners: heat, irrigation schedules, pool upkeep, and the ongoing effort to keep the patio and other outdoor spaces comfortable after sunset.

Now there’s another timely reminder for the season: health officials have confirmed West Nile virus activity in Arizona for 2026.

In May, the Maricopa County Department of Public Health confirmed a human West Nile virus case for the 2026 season. The county later reported its first West Nile-related death in June, and Pima County reported its first probable case of the season. Mosquito testing has also detected the virus in Maricopa County, confirming that West Nile activity is present locally.

The goal is not to make Arizona homeowners worry every time they step outside. It is to make sure residents know West Nile is active locally and understand how it spreads. In Arizona, infected mosquitoes can transmit the virus through mosquito bites, which is why taking steps to reduce mosquito activity and avoid bites is especially important during peak season.

phoenix family enjoying summer evening without mosquito bites

2026 West Nile Activity in Arizona

The CDC has reported 50 West Nile virus disease cases in Arizona for 2026, including 40 cases in Maricopa County. These are provisional numbers and may change as state and local health departments continue reporting cases. Readers can view the latest statewide and county-level totals on the CDC’s current-year West Nile virus data page.

Mosquito testing also shows local activity. Maricopa County Environmental Services reported 183 West Nile-positive mosquito samples in 2026, based on testing completed through July 13.

For perspective, Arizona reported 65 confirmed and probable West Nile virus cases in 2025. That data comes from the Arizona Department of Health Services' weekly communicable disease summary. The county breakdown included 56 cases in Maricopa County, 4 in Pinal County, 3 in Pima County, 1 in Apache County, and 1 in Graham County.

Why Arizona Homeowners Should Pay Attention

West Nile virus is not new in Arizona, but each season can look different. Heat, irrigation, summer storms, and shady yard areas can all affect mosquito activity.

Arizona’s summer monsoon season can also play a role. Monsoon storms may bring short bursts of heavy rain, longer storm systems, or repeated rounds of moisture. Water can collect in planters, buckets, drains, low spots, pool toys, and other small areas around the yard. When that water sits, mosquitoes can breed in it. That can increase mosquito activity around patios, pools, and shaded outdoor spaces.

West Nile virus most often spreads through the bite of an infected mosquito. Activity typically runs through summer into fall. Many people who get infected do not feel sick. Others may develop symptoms, and a smaller number can experience severe illness.

For homeowners in Phoenix, Tucson, and Southern Arizona, the takeaway is simple: mosquitoes do not need much water to become a problem. Irrigated landscaping, shaded yard areas, pool areas, planters, clogged drains, and summer storms can all add to mosquito pressure.

How Professional Mosquito Control Helps

Mosquitoes are more than a nuisance when West Nile is a threat. Around Arizona homes, these biting pests often gather in the outdoor spaces that families use most. That includes patios, pool areas, shaded landscaping, shrubs, and spots where water is hard to fully eliminate.

Northwest Exterminating offers seasonal mosquito control for homeowners across the Phoenix metro, Tucson, and Southern Arizona from May through September. Our licensed specialists look for areas around the property where mosquitoes may be resting, then treat those spots and, when needed, standing water where they may breed.

No mosquito service can eliminate every mosquito or guarantee disease prevention. But reducing mosquito activity around the yard can help reduce the risk of bites. It can also make patios, pools, and outdoor gathering spaces more comfortable for your family this summer.

Take Back the Patio This Summer

West Nile virus is active in Arizona this year, making mosquito control especially timely for homeowners who spend summer evenings on the patio, by the pool, or elsewhere in the yard. If mosquitoes are making those spaces difficult to enjoy, now is a good time to take steps to reduce them.

Northwest Exterminating serves homeowners throughout the Phoenix metro, Tucson, and Southern Arizona, with service tailored for Arizona’s desert environment.

Ready for fewer mosquitoes around your outdoor living spaces? Contact Northwest Exterminating today to schedule mosquito control or request a free consultation.