Walla Walla County, WA Right to Farm: Farm Nuisance Protection (2026)

Section 8.40.010 defines a covered farm operation broadly, including marketing produce at roadside stands or farm markets, noise, odors, dust, fumes, operating machinery and irrigation pumps, ground and aerial seeding and spraying, applying chemical fertilizers, conditioners, insecticides, pesticides and herbicides and their drift, and the employment and use of labor. Section 8.40.020 then supplies the core protection in two parts: a farm operation is not a public or private nuisance if it conforms to generally accepted agricultural and management practices, and separately is not a nuisance if it existed before a change in the land use or occupancy of adjacent or nearby land.

Section 8.40.030 adds that farm operations cannot be restricted to particular times of day or days of the week, so long as they follow accepted agricultural practices. Section 8.40.040 requires plats, short plats, and development or building permits issued within one-quarter mile of agricultural or resource zones to carry a notice warning that nearby designated agricultural lands may host activities incompatible with residential development. Section 8.40.050 further protects the use of county rights-of-way by slow-moving agricultural vehicles and for moving livestock and farm products, barring a claim for relief that arises solely from a county ordinance, resolution, or inherent authority.

The county's separate noise chapter reinforces this framework: Section 9.20.065 exempts farm production activities, including machinery, irrigation pumps, spraying, and fertilizer application, from the noise regulations entirely.