1 county-level rule, plus city-specific rules for 2 cities in Sonoma County, California.
Verified from official government sources
Removing protected native trees in unincorporated Sonoma County requires a permit under the Tree Protection Ordinance (Code 26-88-010): a zoning permit for native species 6 inches DBH or larger, and a use permit for hardwoods 36 inches+ and redwoods 48 inches+. Valley oaks in a Valley Oak Habitat Combining Zone and Heritage/Landmark trees (Chapter 26D) get extra protection.
2 cities in Sonoma County have their own tree protection rules. Each link goes to that city's dedicated page with code citations.
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Sonoma County Ordinance Hub →