Cal. Civ. Proc. Code § 337.5

Within 10 years:

(a) An action upon any general obligation bonds or coupons, not secured in whole or in part by a lien on real property, issued by any county, city and county, municipal corporation, district (including school districts), or other political subdivision of the State of California.

(b) An action upon a judgment or decree of any court of the United States or of any state within the United States.