smiling vector control supervisor in a labVector Control protects health and enhances livability through control of the rat and mosquito populations, and serves as a resource for addressing public health vector problems. Programs include Rodent Control, Mosquito Control and Code Enforcement, which enforces some specific county and city municipal codes.

Our surveillance, education, prevention and control activities are done in accordance with and authority granted from Oregon Revised Statute 452.

What's a Vector?

Vector is another word for animals or organisms that can spread disease to humans. In Multnomah County, mosquitoes and rats are the most common vectors.

Our Work

  • Monitor the presence of mosquitoes and mosquito-borne disease
  • Inspect potential mosquito breeding habitats
  • Maintain safe and comfortable mosquito population levels
  • Provide mosquitofish to control mosquito larvae in ornamental pond and pools
  • Conduct rat inspections to help residents control rats in and around their home
  • Provide technical assistance to landowners and community groups about prevention

Code Enforcement

The Code Enforcement program ensures community livability through the education and enforcement of Multnomah County and City of Portland regulations including:

  • City of Portland Title 13 Animals
  • Multnomah County MCC Chapter 15 Sheriff Chapter 15: Sheriff (1.06 MB)
  • Multnomah County MCC Chapter 21 Health
  • City of Maywood Park, Municipal Codes
  • Metro Regional Government Code Chapter 5.09 Illegal Dumping

Community Education

Understanding pests is the first step to preventing and controlling them. We are happy to come to your school, organization or civic club to offer education on vectors like mosquitoes and rats. We often discuss:

  • Our work
  • Where vectors like mosquitoes or rats come from
  • The diseases that vectors carry
  • How to prevent vectors in your home and community

Please contact us with a description of the information your group needs.


Contact Us

Multnomah County Vector Control
5235 N Columbia Blvd
Portland, Oregon
503-988-3464

vector.nuisance@multco.us