For questions and answers regarding mosquito spraying please click here.
Q. What authority do you have regarding neglected swimming pools?
A. We appreciate attention to maintaining pools in a manner that does not produce mosquitoes. If the pool or other sources produce mosquitoes, we have the authority to initiate legal procedures pursuant to Civil Code Section 2929.3 and Health and Safety Code Sections 2020 and 204(m). A copy of our Districts’ resolution is available for perusal. Click here for more information.
West Nile Virus
Q. Do we expect more human cases this year?
A. We remain confident that our mosquito control program will have a significant impact on keeping human cases to a minimum. No one can predict the number or severity of cases.
Adult Mosquito Control Notifications
Q. How do you notify people and why can’t you do it sooner?
A. We have a very comprehensive response plan that relies on real-time data about mosquito populations, virus transmission and weather conditions. Once we determine that there is a risk to the public, we act immediately, sometimes within hours of our decision to conduct adult mosquito control operations, before the mosquitoes fly away and the conditions to control them change. People wishing to be notified about adult mosquito spraying have several options. They may visit the District’s web site and opt to receive notifications automatically by email, they can view information on the District web site, or they may phone the District for a recorded message at (925) 685-9301. We also work closely with the media, though, they are not always able to publish or announce the information in time of advanced notifications.
Q. How long does standing water need to exist before mosquitoes can begin their life cycle?
A. All 23 species of mosquitoes in Contra Costa County (as well as every species worldwide) require standing water in order to begin their life cycle. Mosquitoes can go from egg to flying adult in as little as five days. Dump or drain cans, buckets, containers - anything on your property that is holding water, to prevent mosquitoes.
Q. Can you deliver mosquitofish to my house?
A. Mosquitofish for backyard ponds and non-maintained swimming pools can be picked up for free from our office in Concord Monday through Friday from 8:00 a.m. to 4:30 p.m. Simply provide us with the surface area amount of of your water feature so we can determine how many fish you will need and confirm you are a county resident and we will happily provide the appropriate number of fish to you free of charge.
Other Insects and Animals
Q. Who should I contact regarding issues I am having regarding squirrels, moles, possums, raccoons, ants, spiders, etc.?
A. Please click here for resources that can help you with insects and animals for which we do not provide service.
Q. How come you don’t pick up and test ALL dead birds reported to you?
A. We appreciate all dead bird reports. West Nile virus is a serious disease and reporting dead birds gives us crucial information for our surveillance and control efforts. Not all birds can be picked up and tested, but just the report itself provides crucial information for our surveillance and control efforts.
More About the District
Q. Does your District provide presentations for people who want to learn more information?
For questions and answers regarding adult mosquito control please click here.