Landscaping Rules in Walla Walla County, WA (2026)
5 rules for unincorporated Walla Walla County, Washington.
Verified from official government sources
Tree Trimming
In unincorporated Walla Walla County, WWCC 12.26.050.B.5 bans trees, plants, shrubs or any part of them from overhanging and interfering with the use of a public road, sidewalk, path or trail, treating overgrown vegetation as a prohibited right-of-way obstruction the same as any other unlawful encroachment.
Walla Walla County Overhanging Vegetation Rule
Some RestrictionsWalla Walla County Code § 12.26.050(B)(5)
B.Activities and Conditions. The following activities and conditions also are prohibited obstructions: ... 5.Overhanging Vegetation. Any trees, plants, shrubs or vegetation, or any parts thereof, placed or maintained in such a manner as to overhang and interfere with the operation or use of any public road, sidewalk, path or trail.
Tree Removal & Heritage Trees
In areas of unincorporated Walla Walla County mapped as high-density wintering birds-of-prey habitat, a development permit other than for a single-family dwelling limits tree and perch removal to hazard trees only, under WWCC 18.08.640(I), unless Community Development approves otherwise after reviewing a critical area report. The rule sits inside the county's fish and wildlife habitat conservation area standards.
Walla Walla County Habitat-Area Tree Removal Limit
Some RestrictionsWalla Walla County Code § 18.08.640(I)
18.08.640 - Performance standards—General requirements. ... I.In areas designated as high density of wintering birds of prey, tree and perch removal connected with a development permit other than a single-family dwelling, shall be limited to hazard tree removals unless otherwise approved by the department, after review of a critical area report.
Weed Ordinances
On developed, urban-zoned lots in unincorporated Walla Walla County, grasses and weeds cannot average more than twelve inches tall under Walla Walla County Code Section 8.24.010(B)(5)(a). Community Development and the Sheriff enforce the rule as a nuisance violation, with civil infractions starting at $75.00 for a first offense under Section 8.24.020.
Walla Walla County 12-Inch Weed Height Limit
Some RestrictionsWalla Walla County Code § 8.24.010(B)(5)(a)
5.The following conditions of vegetation:a.Grasses or weeds not maintained to an average height of twelve inches on any property that is developed; or
Rainwater Harvesting
Unincorporated Walla Walla County does not regulate rainwater harvesting directly, but WWCC 11.04.070(B) rewards it: a new or remodeled commercial building with a properly built and maintained rainwater harvesting system earns a credit against its annual stormwater service charge, and the county will consider a larger reduction case by case based on how much rainwater the system actually captures.
Walla Walla County Rainwater Harvesting Credit
Few RestrictionsWalla Walla County Code § 11.04.070(B)
B.Credit for Rainwater Harvesting Systems. New or remodeled commercial buildings that use a properly constructed and maintained permissive rainwater harvesting system shall be eligible for a ten-permit credit applied toward that portion of their stormwater service charge arising from the building on which the system is used. The county shall consider additional rate reductions in individual cas...
Composting
Unincorporated Walla Walla County carves household compost piles out of its debris-nuisance rule: a pile kept outside the front or side yard for the household's own use does not count toward the one-cubic-yard trash accumulation limit under Walla Walla County Code Section 8.24.010(B)(1). The code sets no bin design or size standard, only the household-use condition.
Walla Walla County Household Compost Pile Exemption
Few RestrictionsWalla Walla County Code § 8.24.010(B)(1)
1.The outside accumulation of more than one cubic yard of waste, rubbish and trash, including but not limited to bottles, cans, glass, wire, broken crockery, broken plaster and any other similar abandoned, discarded or unused material, which is visible by ordinary view from an adjacent property or road, unless kept in covered bins or receptacles; provided, that nothing herein shall prohibit the...
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