Water Code § 10729.2

With the exception of regulations required by Sections 10722.2 and 10733.2, a guideline, criterion, bulletin, or other technical or procedural analysis or guidance prepared by the department as required by this part is not subject to the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code).