Practice the 4 D's of Prevention!
• Use Deet or an alternative;
• Dress in long sleeves and pants;
• Avoid Dusk until Dawn; and
• Drain standing water.
2020 Season Updates
Weekly trapping will begin Sunday, June 14. This trapping activity looks for Culex mosquitoes that carry the West Nile Virus.
Larvacide, which attacks mosquitoes in the larval stage before they become airborne, will also begin soon. Residents may see treatment trucks in their neighborhoods. These trucks are NOT fogging or spraying.
The risk of West Nile Virus is curently low, but not non-existent. Residents are encouraged to practice the 4D's of prevention, as shown on this webpage.
Want to stay up to date on Longmont's mosquito activity this season? Now is the time to sign up for eNotifications. Doing so will ensure you receive weekly updates once WNV-positive mosquitoes have been identified in the three-county area. Sign up for eNotifications and be sure to choose the West Nile Virus category >
Mosquito Control Strategy
The City of Longmont contracts with Vector Disease Control International (VDCI) to implement an Integrated Pest Management Program to combat mosquitoes that might carry the West Nile Virus. The program focuses on first attacking mosquitoes in their larval stage before they become airborne. Known as larvicide, this is the best method since it eliminates mosquitoes before they hatch. This method also minimizes fogging or spraying to kill the adult, airborne bugs.
If Needed Spray Areas
VDCI maintains a map that displays typical mosquito "hotspots" around Longmont. These hotspots are evaluated annually (at a minimum) and adjusted as necessary. When local spraying is needed, it will be concentrated to these specific, predetermined hotspot zones. Spraying typically occurs on Thursday nights (weather permitting).
Citywide spraying is only conducted in cases of very large outbreaks and only after being directed by the county Health Department with input from the federal Centers for Disease Control (CDC).
Request Spray Notification or Shutoff
VDCI maintains a database of Longmont residents that have made notification or shutoff requests for their property if spraying is scheduled. There are three options:
- Call Notification Only - VDCI will phone you before spraying in your neighborhood
- Address Shuffoff Only - VDCI will shutoff the spray machine while driving past your property
- Notification & Shutoff - VDCI will phone you before spraying in your neighborhood and shutoff the spray machine while driving past your property
Please contact VDCI to make a notification or shutoff request (online form available on their webpage).
City Email News
The City's eNotification system provides residents with up-to-date information on a variety of topics including West Nile Virus. Visit the eNotification subscription page now to sign up. Choose the West Nile Virus topic to receive news updates on this topic every time they are sent out.
Practice the 4 D's of Prevention!
Protect yourself from West Nile Virus by following these tips during the summer.
- Use Deet or an alternative;
- Dress in long sleeves and pants;
- Avoid Dusk until Dawn; and
- Drain standing water.
- Report problem areas in your neighborhood by calling VDCI at 970-278-9977
- State Department of Public Health and Environment's West Nile virus information hotline 303-692-2799
- For information in Boulder County, contact the Boulder County Health Department at 303-441-1564 or communicable diseases at 303-413-7500
Websites and Videos
- Boulder County West Nile Website
- Fight The Bite Website - Statewide website regarding West Nile Virus prevention program
- State of Colorado Department of Public Health and Environment Information on West Nile Virus
- Centers for Disease Control and Prevention (CDC); West Nile Virus video
- "Mosquito" - a one-hour worldwide look at mosquitoes and their impacts on health and the global economy from the Discovery Channel