The entire City (including Rossmoor) is in Flood Zone X. Zone X is:
- Areas of 500 year flood
- Areas of 100 year flood with average depths of less than 1 feet or with drainage areas less than 1 square mile
- Areas protected by levees from 100 year flood
Community Number is 060226; Panel Numbers are 0105, 0112, 0116; and Suffix is H. Effective Map Date is September 15, 1989, revised February 18, 2004.