Cal. Water Code § 13307.1

(a) The state board and the regional boards shall not consider cleanup or site closure proposals from the primary or active responsible discharger, issue a closure letter, or make a determination that no further action is required with respect to a site subject to a cleanup or abatement order pursuant to Section 13304, unless all current record owners of fee title to the site of the proposed action have been notified of the proposed action by the state board or regional board. (b) The state board and regional boards shall take all reasonable steps necessary to accommodate responsible landowner participation in the cleanup or site closure process and shall consider all input and recommendations from any responsible landowner wishing to participate. (c) In addition to the requirements of subdivision (a), if the state board or the regional board finds that the property is not suitable for unrestricted use and that a land use restriction is necessary for the protection of public health, safety, or the environment, then the state board and the regional boards may not issue a closure letter, or make a determination that no further action is required, with respect to a site that is subject to a cleanup or abatement order pursuant to Section 13304 and that is not an underground storage tank site, unless a land use restriction is recorded or required to be recorded pursuant to Section 1471 of the Civil Code.