San Dimas, CA
San Dimas, CA's wildfire risk, in USFS's own numbers
Out of every US place USFS scores, San Dimas lands at the 100th percentile for wildfire risk to structures — in USFS's highest wildfire-risk band nationally — a figure built from its 12,159 buildings, not the land around them. (Source: USFS's Wildfire Risk to Communities methodology.)
USFS's separate burn-probability score — fire likelihood alone, before counting what's built there — puts San Dimas at the 99th percentile, close to its 100th-percentile risk score.
San Dimas's building exposure, zone by zone
Most of San Dimas's buildings (68.6% of 12,159) fall outside USFS's Direct and Indirect zones entirely — that doesn't zero out the score above, it means the risk is regional, not structure-by-structure. At 12,159 buildings, this is a substantial built environment, so the shares below describe a real population of structures, not a handful of edge cases.
San Dimas against the rest of the country
San Dimas's risk sits at a similar level relative to California (94th percentile statewide) as it does nationally (100th) — this place isn't unusual for its own state either way. Among the 31,521 US communities USFS scores, San Dimas ranks 128 for wildfire risk (1 is highest) and 1,279 by building count (1 is largest). Within California alone, it ranks 85 of 1,570 places by risk. See the full county-by-county picture for California on its state page.
San Dimas and the insurance market
Because San Dimas is in California, a wildfire-hazard disclosure is legally required before a sale closes here — unusual nationally, since only these two states mandate it. The state's FAIR Plan alone carried 668,609 policies by the end of 2025. Full detail in the disclosure-law guide.
Lowering exposure, not just insuring around it
With 68.6% of buildings rated Minimal exposure, San Dimas gets less benefit from structure hardening than a Direct- or Indirect-dominant place would — the home-hardening guide explains why the zone matters.
Where San Dimas's figures come from
The methodology guide shows exactly how USFS turned 12,159 counted buildings into the percentiles shown above for San Dimas. The exposure-zones guide covers what San Dimas's dominant minimal exposure actually means, with real examples from across the dataset.