Cal. SHC § 5132.4

If the legislative body has complied with the notice, protest, and hearing provisions set forth in this article, or if the legislative body is not required to comply with those requirements because the assessment is exempt from the procedures and approval process set forth in Section 4 of Article XIII D of the California Constitution, then those requirements shall not apply in subsequent fiscal years unless the assessment methodology is changed to increase the assessment, or the amount of that assessment is proposed to exceed an assessment formula or range of assessments adopted by an agency in accordance with Article XIII D of the California Constitution or Section 53753 of the Government Code.