Working together to strengthen and support noxious weed management efforts in Montana.


Discarding Empty Pesticide Containers & The Montana Pesticide Disposal Program

Thursday, August 21st, 2014


Pesticide applicators should be aware of the resources available for discarding pesticide containers and pesticide waste. By following a few simple steps applicators can ensure that empty and partially filled pesticide containers are discarded and disposed of legally.

Disposing of Empty Pesticide Containers

Prior to discarding any pesticide containers a pesticide applicator is required to power-wash or triple rinse the containers. The rinsate should be discarded in pesticide tanks and sprayed over a site listed on the pesticide product label at or below required product label rates. After triple rinsing, the container should be rendered unusable by puncturing. The Montana Department of Agriculture Pesticide Container Recycling Program is an option for applicators desiring to keep pesticide container plastic out of Montana’s landfills. This program has collected more than 288,000 pounds of pesticide containers since October 2009. Numerous sites across Montana are available that applicators may use by simply searching the container recycling map at Once an acceptable site is found, applicators may contact the local cooperator to arrange a drop off of empty pesticide containers (refer to the recycling map link). Shredded plastic from pesticide containers is recycled to create non-consumer items such as drain tile, roadway speed bumps, pallets and landscape edging.

Disposing of Pesticide Waste

Applicators should use the Montana pesticide waste disposal program if they have unknown pesticide products (due to worn product label), unregistered pesticide products or unusable pesticides that are in need of disposal. The Montana pesticide waste disposal program began in 1994 and has collected more than 455,600 pounds of pesticide waste since onset. Common pesticides brought to the event include DDT, chlordane, 2,4,5-T and strychnine. The disposal fee is FREE for the first 200 pounds and $0.50/lb for amounts in excess of 200 pounds for licensed pesticide applicators. Pesticide disposal program locations and dates are:

  • September 16, 2014 – Kalispell, MT
  • September 17, 2014 – Polson, MT
  • September 18, 2014 – Missoula, MT
  • September 19, 2014 – Bozeman, MT

Participants must pre-register their unusable pesticide with the Montana Department of Agriculture before the event. Registration for the program is requested by the end of August. For the most part, acceptance into the program is on a first come, first serve basis and early sign-up is encouraged. Requirements: Participants must pre-register their unusable pesticide with the Montana Department of Agriculture so the collection can be managed safely and efficiently. The registration form is located at

Please mail registration form to:
Montana Department of Agriculture
Pesticide Disposal Program
P.O. Box 1054
Glasgow, MT 59230

FOR FURTHER INFORMATION: See the MDA Pesticide Container Recycling Program website at or see the MDA pesticide waste disposal program at  Contact
Carli Lofing for additional information regarding the MDA Pesticide Disposal or Container Recycling Program at (406)228-9512 or email at For any other questions contact Cecil Tharp,Pesticide Education Specialist, at the MSU Pesticide Education Program office (406)-994-5067,

New MontGuide on Pesticide Performance and Water Quality

Monday, January 27th, 2014


We’ve had many questions regarding water quality and its impact on pesticide performance.  Adam Sigler and I have compiled resources within a new MontGuide titled “Pesticide Performance and Water Quality”.  This publication provides helpful information on pH, dissolved minerals, suspended solids, water testing tools, and tables including common pesticides.  You can view this on the MSU Pesticide Education website at or, download from the MWCA website, or  order hard copies from MSU Distribution at (406)994-3273.

Missoula County’s Summer Issue of Healthy Acres

Thursday, June 28th, 2012


Missoula County Weed District produces an online magazine called Healthy Acres.   The summer issue is now available to download.

Of special interest to weed warriors is a profile on Purple Loosestrife, and information about the pesticide container recycling.

Learn About Calibration for Using Herbicides

Thursday, August 19th, 2010


One of the most important things that can be done when using herbicides is making sure you are spraying the right plant and you are using the right amount of herbicide.  Learning how to use the right amount of herbicide is called calibration.

There are many ways a person can learn about calibration.

  • Contact your local weed coordinator or extension agent.
  • Attend a Private Applicator’s Class in your area.
  • Use a combination of print and video materials available.

The following are some of the print materials available.  We have provided links or you may contact your extension agent.

MWCA helped to underwrite this short video that demonstrates calibration of equipment.  We have broken it down in to 6 steps.

Chapter 1 Importance of Calibration

Chapter 2 Equipment & Pre-Calibration Check

Chapter 3 Understanding Calibration

Chapter 4 Calibrating Backpack Sprayer and Handline

Chapter 5 Calibrating Using the Strip Method

Chapter 6 Adding Pesticide to Your Tank

MSU Extension also has a DVD available for purchase on their website. There is also information on the MSU Webpage on Calibration.