The use of the word “certify” or “certification” by a licensed land surveyor or registered civil engineer in the practice of professional engineering or land surveying or the preparation of maps, plats, reports, descriptions, or other surveying documents only constitutes an expression of professional opinion regarding those facts or findings which are the subject of the certification, and does not constitute a warranty or guarantee, either expressed or implied.
Source:
Section 8770.6, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=8770.6..