Lewis & Clark County Noxious Weed Control District

The Lewis and Clark County Noxious Weed District education, enforcement, awareness programs and policies support the State Weed Law (MCA 7-22-21). The District encourages management of noxious weeds on private and public lands, subdivisions, timber harvests and open pit mining within the county. Noxious Weed awareness and education strengthens management, lessens the spread of infestations, enhances land values and protects the environment. Noxious weed management is the responsibility of all land managers.

What are Noxious Weeds?(PDF, 33KB)

Montana Noxious Weed List(PDF, 279KB)

2023 Lewis & Clark County Noxious Weed District Spray Summary(PDF, 2MB)

We can help!

  • Property inspections & weed management plan development for your property.
  • Sprayer Rentals available.
  • Resources such as a listing of licensed & insured commercial applicators.
  • Our office has multiple resources for weed related questions, as well as plant identification.

Lewis & Clark County Noxious Weed District Forms & Resources:



Education & Resources:

What are Noxious Weeds?(PDF, 33KB)
Montana Noxious Weed List(PDF, 279KB)
Prevention, Control and Eradication(PDF, 56KB)
FAQ's(PDF, 85KB)
(PDF, 85KB)Impacts of Water Quality on Pesticide Efficiency(PDF, 896KB)
MSU Pesticide Performance and Water Quality(PDF, 495KB)




Mosquito Districts


Lewis & Clark County has 2 Mosquito Control Districts; The Craig Mosquito District and the


The Helena Valley Mosquito Control District was created in 1976. The district includes the area of Green Meadow Drive, north of Custer Avenue, south of the Lincoln Highway and west of Lake Helena Drive, East Helena, Lake Helena and the County fairgrounds.

General Mosquito Management Policy

The Helena Valley & Craig Mosquito Districts have an obligation to monitor and manage mosquitoes within their district to benefit those paying for the service.

The District will handle complaints and concerns on a case basis when it is brought to their attention.

Rental Equipment

For use with Insecticides only.

MD-00 Spray Unit $30.00/day
Bug Magnet #1 $10.00/day
Bug Magnet #2 $10.00/day
Bug Magnet #3 $10.00/day
Propane and electric cord for Bug Magnet is the responsibility of user.

Contact information: JHS, Inc
(406) 443-7487

Mosquito Board

Mosquito District Board Members(PDF, 105KB)

Helena Valley Mosquito District Board

Jim Dusenberry - Chair

Debbie Carlson - Vice-Chair

Dave Baum

David Tudor

John Semple, Contractor

Christian Lehnert, Mosquito Adviser

Susan Good Geise - County Commissioner

Craig Mosquito District Board

Dayl Taylor - Chair

Mike Taylor - Vice-Chair

Dan LaFromboise