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Twain Harte, CA Fire Regulations: Brush Clearance (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Statute
PRC 4291
Distance
100 feet minimum
Zone 0
0-5 ft ember resistant
Enforcer
Cal Fire SRA

Summary

California Public Resources Code 4291 requires 100 feet of defensible space around structures in State Responsibility Areas. Most of Twain Harte is in SRA, making Cal Fire defensible-space inspections routine and enforcement strict.

4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire would be unlikely to ignite the structure. The intensity of fuels management may vary within the 100-foot perimeter of the structure, with more intense fuel reductions being utilized between 5 and 30 feet around the structure, and an ember-resistant zone being required within 5 feet of the structure, based on regulations promulgated by the board, in consultation with the department, to consider the elimination of materials in the ember-resistant zone that would likely be ignited by embers. (2) Remove that portion of a tree that extends within 10 feet of the outlet of a chimney or stovepipe. (3) Maintain a tree, shrub, or other plant adjacent to or overhanging a building free of dead or dying wood. (4) Maintain the roof of a structure free of leaves, needles, or other vegetative materials. (5) Before constructing a new building or structure or rebuilding a building or structure damaged by a fire in an area subject to this section, the construction or rebuilding of which requires a building permit, the owner shall obtain a certification from the local building official that the dwelling or structure, as proposed to be built, complies with all applicable state and local building standards.

Source: California Public Resources Code §4291View official code

Full Breakdown

PRC 4291 requires Twain Harte property owners to maintain 100 feet of defensible space around buildings. Zone 0 (0-5 ft) must be ember-resistant with no combustibles touching the structure. Zone 1 (5-30 ft) must be lean, clean, and green with reduced fuel. Zone 2 (30-100 ft) must have horizontal and vertical fuel separation. Cal Fire conducts inspections in Tuolumne County and issues compliance notices. Following the Rim Fire (2013) and Donnell Fire (2018) experiences, enforcement is taken seriously and is also a condition of insurance availability under the CA FAIR Plan.

Violations & Fines

Cal Fire compliance order with deadline; civil penalties up to $500 first offense, escalating; liability for fire-suppression costs if fire spreads from non-compliant property.

Frequently Asked Questions

Does defensible space let me clear-cut every tree?
No. The goal is fuel reduction, not bare ground. Healthy spaced trees with limbed-up canopies and reduced ladder fuels are preferred.
Will my insurance check defensible space?
Yes. Many California insurers now require documented defensible space, and the FAIR Plan and Safer from Wildfires program reward compliance.

Sources & Official References

Other rules in Twain Harte

All Twain Harte rules

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