No-Spray Day

When you spray pesticides and fertilizers within 72 hours of rain, they may be ineffective when the rain washes them away. That stormwater runoff can also spread chemicals, such as pyrethroids, into the surrounding ecosystem. This can have a harmful effect on your community and environment.

To keep harmful pollutants away, simply don’t spray before it rains!

What are Pyrethroids?

Pyrethroids are a common ingredient in many household and agricultural pesticides. However, overexposure (directly or through water sources) can cause dizziness, nausea, change in awareness, and other side effects, according to the Centers for Disease Control.

What is a No-Spray Day?

A No-Spray Day happens when there is a rain event predicted in the next 72 hours. It indicates that today is not a good day to spray any pesticides or fertilizers because they will not have time to work effectively before the water washes them away.

To make sure your pest control products work properly, avoid spraying pesticides and fertilizers within 72 hours of a predicted rain event. If you work with a pest control service, ask them to come when it’s not expected to rain within the next three days. Additionally, turn off all sprinklers and choose not to water any sprayed areas within 72 hours of spraying.

Tips for Residents

  • Change your irrigation schedule. Don’t water for 72 hours after applying pesticides.
  • Dispose of illegal/banned pesticides and pesticides purchased before (date) at a designated site.
  • Use traps instead of sprays for ant control.
  • Use barriers for snail and slug control.
  • Use food supply reduction for spider control.
  • Email the Master Gardener Helpline for tips on how and when to apply pesticides.
  • Ask your pest control company about IPM (integrated pest management) practices.
  • Schedule pest control services at least three days before any gardening or exterior residential maintenance services.
  • Check labels and purchase only “aquatic safe” labeled insecticides. Look for Our Water Our World certifications and use their interactive map to locate safe products.

Resources

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

Thank You for Keeping Our Rivers & Basins Clear

A Message from the Fresno Metropolitan Flood Control District

While the primary goal of the Fresno Metropolitan Flood Control District is to regulate urban flooding, we also recognize the impact that stormwater runoff can have in bringing pollutants to waterways, including ponding basins, canals, and rivers. These chemicals can seep into our groundwater, affecting the quality and safety of the water you use.

By choosing less-toxic products and not spraying before rainy days, you are limiting the fresh, harmful chemicals that may wash off into our waterways. No-Spray Day helps ensure your pesticides and fertilizers work for you while reducing groundwater pollution in our community.