Updated June 1, 2020 – Placer Mosquito and Vector Control District remains committed to protecting public health in Placer County. We provide an essential public service to prevent mosquito-transmitted disease risk with mosquito surveillance, inspections and control. To support ongoing efforts to slow the spread of COVID-19 and keep our staff safe, our lobby will remain closed and the District will be conducting service requests as long as no in-person contact is necessary.
We use mosquitofish as a preventative biological control treatment against mosquitoes that can reduce, but generally do not eliminate mosquito larvae from a water source. Many factors affect how well mosquitofish will work to minimize mosquitoes including the water’s condition, time of year and species of mosquito present.
During the winter, water temperatures are too cold to release mosquitofish successfully. During March and April, outside temperatures start becoming warm enough for mosquitofish to survive, but mosquitoes that carry West Nile virus are not generally active yet. Unfortunately, this March, due to the COVID-19 pandemic, we were unable to safely conduct in-person property inspections where we usually place mosquitofish as a treatment to ponds and other standing water sources. The District continues to take measures to ensure the on-going health and safety of our staff during the upcoming West Nile virus season.
Today, we are focusing on our community-wide West Nile virus prevention activities to limit future adult mosquitoes. Our field technicians are inspecting and treating known and problematic mosquito habitats like stormwater catch basins, irrigation ditches, wetland areas and unmaintained swimming pools.
If you have a mosquito or vector problem on your property or if you see unusual mosquito activity, please report your problem here. We will resume preventative property inspections and treatments like mosquitofish next spring.