Insured loss estimates from the 24 August South Napa earthquake will not exceed $250m, according to RMS.
The catastrophe modelling firm said the loss estimate for the 6.0 magnitude earthquake reflects the combination of observed damage patterns in combination with the limited earthquake insurance penetration in the region.
Reconnaissance teams found that damage from the South Napa Earthquake was within expectations given the magnitude and location of the earthquake.
RMS said the majority of damage was extremely localised within Napa County, with primary damage due to ground shaking with minimal fire or earthquake sprinkler damage observed by the teams.
The majority of severely damaged unreinforced masonry structures were concentrated in downtown Napa, with reinforced masonry chimney failures observed across the surveyed regions.
The catastrophe modeling firm also said the majority of businesses impacted by the earthquake reopened within a week of the event, following repairs and cleaning efforts. Most area wineries were impacted in some way, primarily by storage barrel damage, but are now open for business.