Above-ground pools holding more than 18 inches of water in unincorporated Marin County require a county building permit and the same barrier protection as in-ground pools; ladders must be removable or secured when unattended.
Unincorporated Marin County sets the permit bar for above-ground pools low — literally. Once a pool holds more than 18 inches of water, a county building permit is required, and the pool must provide barrier protection equivalent to the 60-inch standard that applies to in-ground pools under California's pool-safety law (Health & Safety Code §115920 and following). Access control is the point: ladders must be removable or secured whenever the pool is unattended. The 18-inch threshold catches many pools sold as casual summer setups, so check with the county before filling anything more serious than a wading pool.
Contact your local code enforcement office for specific penalty information.
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See how Marin County's above-ground pools rules stack up against other locations.
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