Prevent Mosquitoes around your Business or Job Site

Mosquitoes develop in standing water. Even small amounts of water can hatch thousands of mosquitoes in just a few days. The best way to prevent mosquitoes and reduce your risk of the diseases they carry is to eliminate standing water around your business or job site.

Ornamental fountains, ponds, and other water features may require regular mosquito control. Mosquito larvicides (products that kill mosquito larvae) are available at most hardware and home improvement stores.

Mosquitoes sometimes develop in plant saucers or in containers with aquatic plants, including ‘lucky bamboo’. If you have plants at your office or business, consider watering them outdoors instead of using plant saucers, or changing water frequently. If you use an irrigation system for outdoor plants or landscaping, ensure that it is in good repair and isn’t leaving standing water.

Check the area frequently for anywhere standing water may accumulate during rain or from other sources. Make it a habit to avoid accumulating empty containers and other debris that can hold water.

Equipment that holds water, like wheelbarrows and buckets, should be stored upside-down or taken indoors when rain is expected. Tarps, equipment covers, and drop cloths should be shaken out regularly or pulled tight so that water doesn’t collect in their folds.

If your work requires you to dig holes or pits, or involves equipment that leaves deep ruts, be alert for the possibility that these may fill with water after rain. Fill ruts and low spots with dirt or gravel as needed, and consider covering or pumping out pits and holes if they won’t be filled within a few days.

Leaks under buildings are a common source of mosquito problems; ensure that your plumbing is in good repair, and use a sump pump if necessary to keep water from accumulating under your foundation or in your crawl space.

Protecting Workers from Mosquito Bites

Workers who spend time outdoors should take precautions against mosquito bites as needed, including using an EPA-registered insect repellent appropriate for the duration of their exposure to mosquitoes. Workers may also want to dress in long pants, long sleeves, and closed shoes. Mosquito-repellent clothing is available for workers who routinely work outdoors in areas with many mosquitoes.

How We Can Help

The District doesn’t provide pest control services to individual businesses, but can help with mosquito problems caused by issues in the area surrounding your business, as well as recommendations for preventing mosquitoes at your business or job site. To request services, call 650-344-8592 or make a service request online.

Page last reviewed: December 28, 2023