Earth ChangesUnstoppable geological problem that has wiped $2bn in value off Californian homes…and counting Posted on August 13, 2025 by Administrator California’s Central Valley is no stranger to wildfires, earthquakes and flooding, but the geological problem that is really rocking the housing market is none of the above. The issue that is having a huge effect on property prices in California’s Central Valley is the ever-sinking ground. Scientists have been worried about the Central Valley’s sinking for over a century, and now it’s time for real estate agents to worry too.