Diazinon Is a Hazard to Our Creeks

The common pesticide Diazinon is becoming a problem in Colorado rivers and streams. Homeowners who dump Diazinon down their drains could be contributing to that problem.

Diazinon dumped down household drains ends up at wastewater treatment plants. Diazinon cannot be removed during the treatment process.

Arvada's wastewater is treated at the Metro Wastewater Reclamation District. The District treats about 165 million gallons of wastewater a day at its Central Treatment Plant - the largest wastewater treatment facility between the Mississippi River and the West Coast. The treated water is discharged into the South Platte River, where it makes up 90 percent of the river for nine months of the year.

It only takes a single homeowner disposing of four ounces of concentrated Diazinon down the drain to affect test organisms at the Central Treatment Plant, meaning it will affect the smaller organisms that live in the river.

Colorado's rivers and streams are a source of drinking water and support fish and other wildlife. We must all do our part to prevent Diazinon from entering any river or stream.

To keep Diazinon and other pesticides out of rivers and streams, please follow these five easy steps:

  • Buy only as much as you need.
  • Use as directed. Do not over apply.
  • Use all of the product, and make sure there are no leftovers.
  • Triple-rinse the empty container with a garden hose.
  • Pour the rinse-water on the grass and let the container dry out, wrap the container in old newspaper, and dispose of it in the trash.

NEVER dump any leftover pesticide down any drain.

If you do have leftover Diazinon, pesticides, or other hazardous materials, take advantage of the Rooney Road Recycling Center which allows you to dispose of household hazardous waste easily and safely.

For a $10 fee, you can bring up to 75 pounds of hazardous chemicals, plus 10 gallons of latex paint, 20 gallons of used motor oil, anti-freeze, and car batteries. You will be limited to one car trunk load. Additional waste will be accepted on a fee basis.

For a $15 fee, you can arrange for a curbside pickup of your household hazardous waste.

Call 1-800-449-7587 for an appointment, normally scheduled for Saturday. The Center is located at 151 S. Rooney Road in Jefferson County.