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Ants

Ants can be considered to be one of the most common pest infestation issues within the Portland Metro and Southwest Washington regions. Odorous house ants ("sugar ants"), pavement ants, and moisture-loving carpenter ants are known to invade houses in the Pacific Northwest region in search of food and nesting spaces, especially during the spring swarming season and following the fall rainy season.

Common in:

Multnomah & Washington Counties: Portland, Beaverton, Hillsboro, Gresham, Tigard, Lake Oswego

Clackamas County: Happy Valley, Oregon City, Wilsonville, Sandy, Estacada, Canby, Molalla

Yamhill & Surrounding Regions: McMinnville, Newberg, Forest Grove, Woodburn

Columbia County: St. Helens, Scappoose

SW Washington / Clark County: Vancouver, Ridgefield, Battle Ground, Brush Prairie, Woodland

Cockroaches

Cockroaches

German, American and Oriental cockroaches remain constant nuisances in the Pacific Northwest region. Though not as reliant on outdoor weather conditions compared to southern states, German cockroaches enjoy favorable conditions indoors all year round, while American and Oriental cockroaches commonly invade basements, crawlspace areas, drains, and commercial buildings in the Portland vicinity.

Areas of high risk for infestation:

Urban Core/Commercial Centers:

• Downtown Portland
• Central Eastside
• Pearl District
• Downtown Vancouver

Multi-Family Units: Apartment complexes and other high-density living areas in Beaverton, Hillsboro, Gresham and Tigard

Food/Hospitality: Restaurants, grocery stores and food preparation establishments in Multnomah, Washington and Clackamas Counties

Industrial/Commercial Property: Warehouses and other commercial buildings in Portland, Vancouver, Wilsonville and Woodburn

 Rodents

Rodents

Roof rats, Norway rats, and house mice are all active throughout the year in the Portland region. These pests are particularly abundant in areas that have lots of trees, overgrown plants, old buildings, and waterways.

Areas Commonly Infested With Rodents:

Metro and Surrounding Areas of Portland:

• Portland
• Beaverton
• Hillsboro
• Gresham
• Tigard
• Lake Oswego
• Happy Valley
• Oregon City

Southwest Washington:

• Vancouver
• Ridgefield
• Battle Ground
• Brush Prairie
• Woodland

Spiders

Black Widow Spiders

Black Widow Spiders

Although more rare in the wet Pacific Northwest climate compared to that of the warmer regions, the Western Black Widow spider can still be found throughout Portland in protected, dark and dry locations in warm summer weather.

Most commonly located in:

Portland Metro/Outlying Suburbs: Portland, Beaverton, Hillsboro, Gresham, Tigard, Lake Oswego, Happy Valley, Oregon City

Southwest Washington: Vancouver, Ridgefield, Battle Ground, Brush Prairie, Woodland

Where they like to hide:

• Garages, sheds and other outbuildings
  
• Pile of wood and other yard items
  
• Under patio furniture
  
• Utility meters, irrigation systems and crawlspaces
  
• Darker corners of basements and storage areas
  

Common House Spiders

The black widow, yellow sac spider, and giant house spider are among the most prevalent spiders found in the Portland area. While relatively harmless, they often build their nests outside but come inside when the temperature starts dropping.

Most common in:

Portland Metro & Surrounding Areas:

• Portland
• Beaverton
• Hillsboro
• Gresham
• Tigard
• Lake Oswego
• Happy Valley
• Oregon City
• 
  

SW Washington:

• Vancouver
• Ridgefield
• Battle Ground
• Brush Prairie
• Woodland

Where they nest:

Garages and sheds

Wood piles and yard waste

Under patios and decks

Basements and attics

Play sets and fences

Mosquitoes



Activity of mosquitoes is higher during warm months and they are typically found in close proximity to stagnant water, irrigated grounds, river valleys, and swamps throughout the Pacific Northwest region.

Typical locations include:

Portland Metro and Surrounding Areas: Portland, Beaverton, Hillsboro, Gresham, Tigard, Lake Oswego, Happy Valley, Oregon City

Southwest Washington: Vancouver, Ridgefield, Battle Ground, Brush Prairie, Woodland

Periphery Locations: St. Helens, Scappoose, Sandy, Estacada, Canby, Molalla, Wilsonville, Woodburn, McMinnville, Newberg, Forest Grove

Fleas & Ticks

Pet owners often have problems with fleas during spring and summer seasons, whereas ticks are commonly found near forest edges, river banks, and hiking trails in the Pacific Northwest region.

Commonly found in:

Metro & Suburban Areas of Portland:

• Portland
• Beaverton
• Hillsboro
• Gresham
• Tigard
• Lake Oswego
• Happy Valley
• Oregon City

Southwestern Washington:

• Vancouver
• Ridgefield
• Battle Ground
• Brush Prairie
• Woodland

Areas where they are usually found:

High grass, bushes and wooded trails

Shaded outdoor areas and underneath decks

Bedding of pets and rugs/carpeting indoors

Baseboards, cracks in floors and upholstery

Wasps & Hornets

Paper Wasps, Yellow Jackets and Bald-Faced Hornets are known to construct their nests in eaves, decks, sheds and tree trunks in the late spring and summer months in the Pacific Northwest area.

Primarily found in:

Metro & Suburbs of Portland: Portland, Beaverton, Hillsboro, Gresham, Tigard, Lake Oswego, Happy Valley, Oregon City

Southwest Washington: Vancouver, Ridgefield, Battle Ground, Brush Prairie, Woodland

Remote Areas: St. Helens, Scappoose, Sandy, Estacada, Canby, Molalla, Wilsonville, Woodburn, McMinnville, Newberg, Forest Grove

Places where their nests are constructed:

• Eaves, Soffits and Gutters of roof
• Decks, patios and porch overhangs
• Sheds and garages
• Tree branches and thick bushes
• Burrows in ground (yellow jackets)

Serving Portland, OR and the entire Portland Metro

Portland

Gresham

Hillsboro

Tigard

Lake Oswego

Happy Valley

Oregon City

Beaverton

Vancouver, WA

Vancouver, WA

Northwest Washington

Vancouver

Battle Ground

Ridgefield

Brush Prairie

Woodland

St. Helens

Scappoose

Columbia City

Warren

Rainier

Clatskanie

Vernonia

Sandy

Estacada

Canby

Molalla

Oregon City

Wilsonville

Woodburn

Canby

Molalla

Aurora

Barlow

Donald

McMinnville

Newberg

Forest Grove

Dundee

Lafayette

Carlton

Dayton

Amity

Sheridan