California Code, Streets and Highways Code - SHC § 25498

Upon the adoption of the resolution by the board, the treasurer of the district shall immediately cause bonds to be issued in the amount and manner provided in the resolution.  The bonds shall be dated as of the date of the resolution and shall be issued and delivered to the persons entitled thereto.  No action or proceeding shall be commenced or maintained after 60 days from the date of their issuance to cancel or set aside the bonds or prevent the payment thereof, or the levy, collection or enforcement of any taxes, assessment taxes or other charges or levies for such payment.