Why Category 3 Hits Hollister Hard
The pattern in Hollister is consistent. sewer lateral collapse during atmospheric river rainfall events drives most of the emergency restoration calls we get. A close second is hillside septic system failure during saturated soil conditions.
Hollister's Mediterranean climate features wet winters and dry summers, increasing the risk of sewer backups during heavy rainfall. The region's proximity to the Salinas Valley also contributes to higher groundwater saturation.
Hollister's Mediterranean climate features wet winters and dry summers, increasing the risk of sewer backups during heavy rainfall. The region's proximity to the Salinas Valley also contributes to higher groundwater saturation. The dominant local driver is sewer lateral collapse during atmospheric river rainfall events, with hillside septic system failure during saturated soil conditions showing up as the next most common cause. Damage builds in stages. Spread. Absorption. Microbial growth. Structural compromise. Every stage you pass through adds to the final bill.

