Anti-Mosquito Spraying Scheduled In Riverside County

JURUPA VALLEY, CA — Vector control officials will conduct anti- mosquito spraying Thursday in an industrial area on the east end of Jurupa Valley to eradicate growing infestations that pose a potential risk to public health.

The Northwest Mosquito & Vector Control District has scheduled "ultra low volume" insecticide treatments between 3 a.m. and 6 a.m. Thursday east of Market Street, west of Brown Avenue, south of Agua Mansa Road and north of the Santa Ana River bottom.

The location contains warehouses, heavy equipment operations and similar businesses.

"This treatment is in response to elevated adult mosquito abundance in this area," the district stated.

Anti-mosquito spraying involves the use of chemicals approved by the U.S. Environmental Protection Agency. Pesticides are emitted as a mist dispersed from machines anchored in the backs of pickup trucks. Officials recommended that during operations, parties stay indoors and keep windows closed until at least 15 minutes after the trucks have departed.

Three human WNV infections have been documented in Riverside County so far this year. Additionally, statewide, 126 infections have been recorded to date in 2026, according to the California Department of Public Health. Six of those resulted in fatal outcomes, none of which have been in the Inland Empire.

In 2025, one human WNV infection was documented in Riverside County, and the patient recovered.

Mosquitoes typically become carriers of the virus after feeding on an infected bird and can then spread the potentially lethal strain to animals and humans. Those at greatest risk include seniors and individuals with compromised immune systems.

Symptoms may never materialize, but can include fever, headache, nausea, body aches, skin rashes and swollen lymph nodes.

Mosquito season in Southern California generally spans May to October. To reduce exposure to mosquitoes with WNV, residents are urged to:

— spend as little time as possible outdoors at dawn or dusk, when mosquitoes are generally on the move;

— wear long pants and long-sleeved shirts during outdoor activity in mosquito-prone areas;

— use insect repellent;

— ensure door and window screens are fitted properly to keep bugs out; and

— get rid of standing water, aside from pools properly treated with chemicals.

More information is available at northwestmvcd.org/, or by calling 951-340-9792.