Cal. CIV § 1940.7

(a) The Legislature finds and declares that the December 10, 1983, tragedy in Tierra Santa, in which lives were lost as a result of a live munition exploding in a residential area that was formerly a military ordnance location, has demonstrated (1) the unique and heretofore unknown risk that there are other live munitions in former ordnance locations in California, (2) that these former ordnance locations need to be identified by the federal, state, or local authorities, and (3) that the people living in the neighborhood of these former ordnance locations should be notified of their existence. Therefore, it is the intent of the Legislature that the disclosure required by this section is solely warranted and limited by (1) the fact that these former ordnance locations cannot be readily observed or discovered by landlords and tenants, and (2) the ability of a landlord who has actual knowledge of a former ordnance location within the neighborhood of his or her rental property to disclose this information for the safety of the tenant.

(b) The landlord of a residential dwelling unit who has actual knowledge of any former federal or state ordnance locations in the neighborhood area shall give written notice to a prospective tenant of that knowledcge prior to the execution of a rental agreement. In cases of tenancies in existence on January 1, 1990, this written notice shall be given to tenants as soon as practicable thereafter.

(c) For purposes of this section:

(1) “Former federal or state ordnance location” means an area identified by an agency or instrumentality of the federal or state government as an area once used for military training purposes and which may contain potentially explosive munitions.

(2) “Neighborhood area” means within one mile of the residential dwelling.