No direct or collateral attack on any public improvement, public improvement ordinance, or apportionment district purported to be authorized or created in conformance with applicable legal requirements, including the requirements of this chapter, may be commenced more than thirty days after publication of notice as required by RCW 39.88.050.

Reviser's note: As to the constitutionality of this section, see Leonard v. Spokane, 127 Wn.2d 194, 897 P.2d 358 (1995).