Weeds and Other Nuisance Vegetation

Overview

The need to regulate the growth of uncontrolled weeds and other vegetation includes 

• the prevention of serious fire hazards,
• the removal of obstructions that interfere with streets and sidewalks,
• the prevention of noxious weed infestation, and
• neighborhood preservation.

Weeds tend to overgrow or choke out more desirable plants, such as desired crops, flower gardens and groundcover, and may become detrimental to public health.

Regulation of unkempt lots and property containing overgrown weeds, debris, and litter is generally accomplished through enforcement of nuisance ordinances. Cities and towns have general authority to address vegetation issues through general nuisance statutes and specific statutes. Counties have specific statutes authorizing weed control districts.

There are statutory provisions in RCW 35.21.310 for any city or town to enact a general ordinance requiring the owner of a property to remove or destroy grass, weed, shrubs, bushes, or trees which are growing or have died and are a fire hazard or a menace to public health, safety, or welfare. Noxious weeds are addressed in Ch. 17.10 RCW and defined as a plant that when established is highly destructive, competitive, or difficult to control by cultural or chemical practices. A Washington state noxious weed list appears in Ch. 16-750 WAC and is maintained by the Washington State Noxious Weed Control Board (WSNWCB). An additional reference source is the U.S. Department of Agriculture's (USDA) Noxious Weeds Program.

Some local jurisdictions have broadened the definition of weed to include both the state list of noxious weeds and other weeds that are commonly considered a nuisance. See examples of definitions in the selected ordinances on this page.

Information on eradicating weeds can also be obtained from agricultural extension offices and/or county-based noxious weed control boards around the state.

Statutes and Regulations

• RCW 35.21.310 — Any city or town may create an ordinance requiring property owners to remove overhanging or obstructive vegetation.
• Ch. 17.04 RCW — Authorizes creation of county weed districts and outlines regulations relating to such districts. Most weed districts have been replaced by county noxious weed control boards.
• Ch. 17.06 RCW — Authorizes creation of inter-county weed districts.
• Ch. 17.10 RCW — Authorizes creation of noxious weed control boards and outlines regulations relating to such districts.
• Ch. 16-750 WAC — Establishes the state noxious weed list and schedule of monetary penalties.

Weed and Vegetation Control

Below are code provisions regulating vegetation and weeds on private property and in the public right-of-way.

Affecting the Public Right-of-Way

• Bellevue Municipal Code Ch. 14.06 — Trees, Weeds, and Vegetation. Addresses trees, weeds, and vegetation affecting the ROW. 
• Burlington Municipal Code Sec. 8.12.020(D) — Types of Nuisances. Requires city supervisor approval for the planting or placement of any tree in a public place; lists specific trees prohibited in public parking strips.
• Kent Municipal Code Sec. 7.04.200 — Sanitary Sewers – Connection with public sanitary sewer. Prohibits planting of certain trees and shrubbery (public and private sewer obstruction).

Height Measures

• Auburn Municipal Code Sec. 8.20.010(C) — Vegetation as a nuisance. Requires grasses (lawn) of residential properties be maintained at a height of six inches or less and grasses, groundcover, and/or vines on vacant lots within/adjacent to developed areas be maintained at a height of 12 inches or less; vegetation above these limits is considered a nuisance.
• Mountlake Terrace Municipal Code Sec. 8.15.040(A) — Nuisances prohibited. Prohibits vegetation exceeding 12 inches in height (exclusive of plants and flowers within a flower bed or container, shrubbery, or trees).
• Pasco Municipal Code Sec. 12.12.110(2) — Trees and Shrubs – Nuisance declared – Violation. Requires weeds, brush, or uncultivated vegetation be maintained at a height of 12 inches or less. 

Fire Season Weed Abatement

• Asotin Municipal Code Ch. 8.08 — Weeds. Makes it a civil infraction for a person, firm, or corporation to allow any grass or weeds in excess of six inches to remain on a property if it becomes dry, inflammable, or combustible.
• Chelan Municipal Code Sec. 8.15.020(B-C) — Landowner responsibility for removing and destroying obstructing, overhanging, dead or hazardous vegetation and debris. Requires landowners to remove overgrown or dead vegetation that could be a fire hazard or menace to public health/safety.
• Everett Municipal Code Sec. 8.08.030 — Dead vegetation—Fire or health hazard. Requires landowners to remove overgrown or dead vegetation that poses a fire hazard.

Noxious Weeds

• Edmonds Municipal Code Ch. 6.30 — Noxious Weeds
• Goldendale Municipal Code Ch. 8.12 — Weeds
• Redmond Municipal Code Ch. 6.12 — Noxious Weed Control and Tree Regulations

County Weed Control Programs

The WSNWCB maintains a list of county-based noxious weed control boards. Below are some sample weed control programs and associated materials and/or projects. 

• Asotin County
  • Biological Control Agents
  • Cost-Sharing Programs — Offers matching funding to private landowners to cover costs of eradication of specific weeds on private property.
• Clallam County
  • Weed Assessment — Allows the county to raise funds for the program via property assessments.
  • Roadside Vegetation Management
• King County
  • Noxious Weeds Blog
  • Brochures and Publications
• Klickitat County
  • Weed List
• Lewis County
  • Ongoing Projects
  • Report a Noxious Weed
• Okanogan County
  • Integrated Control — Encourages integrated strategies for weed control, such as re-vegetation, hand pulling, tilling, herbicides, and bio-controls. 
• Skamania County
  • Hegewald Center Demonstration Garden — Developed to show how to use native plants to build healthy habitats that suppress weeds, increase pollinator foraging opportunities, and shelter wildlife.
• Stevens County
  • Cost Share/Eradication Program 
• Whatcom County
  • Whatcom County Code Ch. 2.27 — Establishes the county's noxious weed control board.

Aquatic Weed Control

Below are documents associated with the control and management of aquatic weeds, including sample local government management plans and general resources.

• Bremerton Kitsap Lake Algae Control and Aquatic Vegetation Management
• King County Aquatic Plants
• MRSC Lake and Beach Management Districts — Provides a general overview of lake and beach management districts in Washington State, including relevant statutes, formation procedures, and examples of local provisions.
• Seattle Integrated Acquatic Vegetation Management Plan for Green Lake (2024)
• Snohomish County Integrated Aquatic Vegetation Management Plan for Lake Serene: Executive Summary (2024)
• Washington State Department of Ecology
  • Aquatic Invasive Plant Technical Assistance — Offers advice on identifying, monitoring, and managing invasive freshwater aquatic plants.
  • Aquatic Noxious Weed Control General Permit — Controls freshwater and marine noxious weeds; covers the indirect discharge of herbicides, adjuvants, and marker dyes into estuaries, marine areas, wetlands, along lake shorelines, rivers, streams, and other wet areas.
• Washington State Department of Agriculture Aquatic Noxious Weed Control NPDES Permits — Allows users to obtain a National Pollutant Discharge Elimination System (NPDES) general permits for use of herbicides to control some aquatic noxious weeds.

Integrated Weed and Vegetation Control

Below are resources related to natural weed control.

• Washington State Department of Transportation Integrated roadside vegetation management plans — Lists intended routine maintenance activities, weed control priorities, sensitive area locations, and other relevant information; includes several plans/areas throughout the state.
• Washington State University Extension Noxious Weeds

Natural Vegetation Management - Grazing

Below are some resources, including code provisions, related to the use of grazing for weed management.

• East Wenatchee Municipal Code Ch. 17.72.200(J) — Farm animals, livestock, and poultry. Allows for the temporary and periodic use of goats for weed control within all zoning districts.
• Mukilteo Municipal Code Sec. 6.18.010(A)(2) — Prohibited animals and conduct – Livestock. Provides for temporary harboring of goats and sheep for vegetation control.

Recommended Resources

• North American Invasive Species Management Association — Network of professionals who implement management programs to prevent the detrimental impacts of invasive species to North America’s lands and waters.
• Northwest Center for Alternatives to Pesticides — Promotes safe pest and weed eradication alternatives for Idaho, Oregon, and Washington.
• Pacific Northwest Pest Management Handbooks Weed Management Handbook — A reference guide for weed control practices and herbicides used in Idaho, Oregon, and Washington.
• USDA National Invasive Species Information Center — Serves as an “all-taxa” portal for invasive species information and an educational gateway to information, organizations, and services about invasive species.