2 county-level rules, plus city-specific rules for 1 city in Snohomish County, Washington.
Verified from official government sources
Unincorporated Snohomish County has no formal dark-sky ordinance, but its development standards require outdoor lighting to be hooded or shaded so direct light does not create glare when viewed from surrounding property or rights-of-way.
SCC 30.22.130
Artificial lighting shall be hooded or shaded so that direct outside lighting, if any, will not result in glare when viewed from the surrounding property or rights-of-way.
In unincorporated Snohomish County outdoor lighting must be hooded or shaded so that direct light does not glare onto surrounding property or rights-of-way. Sign lighting has the same rule, so light spilling onto a neighbor can be a violation.
SCC 30.27.010
Artificial lighting, excluding digital signs, shall be hooded or shaded so that direct light of lamps will not result in glare when viewed from the surrounding property or rights-of-way.
1 cities in Snohomish County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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