Tacoma's Landscaping Rules: The Rules That Matter

Every city handles landscaping rules a little differently. In Tacoma, Washington, there are 7 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Water Restrictions

New automatic in-ground irrigation systems in Tacoma must include an automatic clock, leak-detecting flow sensors, backflow-protected valves, and a rain-sensing shutoff under TMC § 2.06.120's water conservation standard.

Key details: Governing section: TMC § 2.06.120 / UPC 423.0. Required feature: Automatic clock plus leak-detecting flow sensor. Rain sensor: Must interrupt or reduce watering after rain. Exemption: Landscaped areas under 10,000 square feet.

Section 423.0 is part of the adopted City of Tacoma Plumbing Code, so a noncompliant irrigation installation is subject to TMC § 2.02.130's misdemeanor/civil-infraction process and TMC Chapter 1.82 enforcement, the same as any other Plumbing Code violation.

Weed Ordinances

Tacoma treats grass, weeds, or brush over one foot tall on any lot as a public nuisance the property owner must correct, with limited exceptions for erosion control or critical areas.

Key details: Governing section: TMC § 8.30.040.C.2. Height limit: grass/weeds over one foot. Declared: public nuisance, owner responsible. Exceptions: erosion control, critical areas (13.11).

A cited owner who doesn't cut overgrown grass and weeds faces code enforcement under Chapter 8.30, including a formal notice and the city's right to abate the nuisance itself and bill the owner for the cost.

Native Plants

Tacoma requires all plants used to meet landscaping code requirements to be climate-adapted and explicitly permits native species anywhere; UR-1 and UR-2 development must make at least half of non-tree plantings regionally native, rising to 100 percent inside Open Space Corridors, per TMC § 13.06.090B.3.d.

Key details: Required plantings: 100% must be climate-adapted. Native plants: encouraged and permitted everywhere. UR-1/UR-2 minimum native: 50% of non-tree plants. Open Space Corridors minimum: up to 100% native. Governing section: TMC § 13.06.090B.3.d.

Landscaping installed to meet a development's Site Development Standards but built with a non-compliant plant palette is a Title 13 violation, correctable through the Director's review and TMC § 13.05.150's Code Enforcement process.

Tacoma is more permissive than most cities when it comes to native plants. That said, there are still limits.

Rainwater Harvesting

Tacoma's zoning code lets rain barrels, tanks and cisterns encroach into a required yard setback, with size and clearance limits that scale up for larger catchment tanks.

Key details: Small tanks: 600 gal or less, each under 4' wide. Lot-line clearance: minimum 3 feet required. Yard coverage cap: 10% of yard area. Front-yard tanks: must be screened from view.

Placing an oversized or unscreened catchment tank inside a required setback, crowding the lot line, or exceeding the 10% yard-coverage cap is a setback-encroachment violation subject to Tacoma code enforcement.

Tree Trimming

Tacoma requires tree branches to clear at least 8 feet above sidewalks and 14 feet above streets. Vegetation that doesn't meet these heights is a public nuisance the abutting property owner must trim back.

Key details: Sidewalk clearance: 8 feet minimum above grade. Street clearance: 14 feet minimum above grade. Classified as: public nuisance under TMC 8.30. Who must trim: abutting/responsible property owner. Max penalty: up to $10,000 per day.

Allowing the nuisance to persist is unlawful under TMC § 9.20.340B. Chapter 9.20 violations are enforced under the Uniform Enforcement Code (TMC 1.82), with penalties up to $10,000 per day.

Composting

Tacoma exempts a backyard compost pile from its vegetation-waste nuisance rule as long as it stays under two cubic yards, giving residents a lawful way to dispose of grass clippings and yard trimmings on-site.

Key details: Governing section: TMC § 8.30.040.C.3. Compost cap: 2 cubic yards. Firewood alternative: stacked, cut 4 ft or less. Exceeds cap: treated as nuisance vegetation waste.

A compost pile over two cubic yards forfeits the exemption and is treated as illegally accumulated vegetation waste, a public nuisance citable under Chapter 8.30.

Tree Removal & Heritage Trees

Removing a tree of 6 inches DBH or larger in Tacoma triggers a Canopy Loss Fee under TMC § 13.06.090B.3.e(3)(e), calculated per inch of canopy lost minus the caliper inches of any replacement trees planted, funding the city's Urban Forestry Program.

Key details: Fee trigger: trees 6 inches DBH or larger. Fee formula: (loss inches minus replanted caliper) x $/inch. Applies in: Urban Residential (UR) zones. Extra protection: trees 24+ inches DBH. Governing section: TMC § 13.06.090B.3.e(3)(e).

Removing a regulated tree without paying the assessed Canopy Loss Fee, or without meeting an applicable exemption, violates TMC § 13.06.090B and TMC § 13.05.150; the City can require corrective planting and impose Code Enforcement penalties under TMC Chapter 1.82.

The Bottom Line

Tacoma's landscaping rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Tacoma is broadly strict or permissive.

Keep in mind that Tacoma can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.