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What You Can Burn and When
Only leaves, woody debris or brush less than 5 inches in diameter, or untreated wood and dimension lumber (subject to Env-A 1001.05(g) below) can be burned. For any open burning a written fire permit is required. Even with the permit, no open burning is allowed between the hours of 9:00 am and 5:00 pm unless it is raining.
When the ground where you are burning is completely covered with snow no fire permit is required. However, be sure to check local ordinances that might restrict winter-time burning.
The permittee will be required to have suppression equipment on site while the burning is being done and the fires will have to be totally extinguished or be constantly attended.
Air quality regulations restrict the type of material burned in the open. Stumps, painted or treated lumber, tires, tubes, plastics, foam rubber and shingles are some of the prohibited materials (see Department of Environmental Services, Air Resources Division Open Burning Rules). Per Env-A 1001.05(g) "On-site burning, by the owner of a private, single-family residence occupied by the owner, of untreated wood, provided the material originates on site".
The Forest Ranger for your town/city and local Warden are needed to issue a commercial permit to burn when no other means of disposal of material is available, such as chipping, hauling to a landfill or other methods of legal disposal.