Mosquito Spraying Scheduled This Week In Lake Elsinore

The pesticide being used is Natular G30, a U.S. Environmental Protection Agency (EPA Reg. #839-83)-approved product.

By Toni McAllister, Patch Staff

Apr 21, 2026 4:49 pm PDT | Updated Apr 21, 2026 4:55 pm PDT

The Northwest Mosquito and Vector Control District is conducting the spraying using an unmanned aerial system (shown above) operated by FAA-certified pilots, according to the district. (Northwest Mosquito and Vector Control District)

RIVERSIDE COUNTY, CA — Mosquito spraying is scheduled Thursday in portions of Lake Elsinore and Eastvale.

The Lake Elsinore treatment will take place in a portion of a wildlife preserve on the lake's southeast side.

The treatment area in Lake Elsinore is shown in orange. (Map: Northwest Mosquito and Vector Control District)

In Eastvale, treatment takes place south of Citrus Street and east of Harrison Avenue near the wetland ponds adjacent to the Santa Ana River.

The treatment areas in Eastvale are shown in orange. (Map: Northwest Mosquito and Vector Control District)

The Northwest Mosquito and Vector Control District is conducting the spraying using an unmanned aerial system operated by FAA-certified pilots, according to the district.

"This new standard treatment method allows District staff to better manage mosquito populations in inaccessible areas," according to the Northwest Mosquito and Vector Control District.

The pesticide being used is Natular G30, a U.S. Environmental Protection Agency (EPA Reg. #839-83)-approved product that is also OMRI-certified for organic crops. It is a "dry pesticide" that "drastically reduces the potential of pesticide drift," according to the district.

Mosquitos can harbor disease, including West Nile Virus. No West Nile virus infections have been documented in Riverside County, or anywhere else in California, so far this year.

In 2025, a total of 113 infections were recorded statewide, according to the California Department of Public Health. There were 11 WNV-related deaths throughout the state last year. Riverside County reported one infection to the U.S. Centers for Disease Control in 2025, and it wasn't fatal.

Mosquito season in Southern California generally spans May to October. To reduce exposure to mosquitoes, 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.

For more information about Thursday's treatment, call the Northwest Mosquito and Vector Control District at 951-340-9792 or email office@northwestmvcd.org.