Tri-Cities zoning codes prohibit outdoor lighting from spilling past property lines. Kennewick defines light trespass as light shining beyond the property boundary and requires fixtures aimed so the lamp's line of sight stays on the owner's lot.
In the Benton County Tri-Cities, light trespass is controlled through municipal zoning rather than a county rule. Kennewick's outdoor light chapter (KMC 18.39) defines light trespass as light produced by a luminaire shining beyond the boundaries of the property where it sits, and requires fixtures to be shielded so the lamp's direct line of sight stays on the owner's own property. Richland's standards (RMC 23.58) work the same way, minimizing spillover onto neighboring lots and public spaces. Floodlights aimed at a neighbor's home run against these codes. In unincorporated Benton County, a homeowner bothered by a neighbor's glare relies on nuisance law and can also pursue a civil claim.
Lighting that throws glare across a property line draws a correction notice from city planning. Unresolved commercial violations face escalating penalties. In unincorporated areas, persistent glare may support a civil nuisance claim.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Benton County's light trespass rules stack up against other locations.
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