§ 870.Judgment Binding and Conclusive; Time For Filing Notice of Appeal

This is where a validation action delivers on its promise. Once a judgment in a validation case becomes final -- because no appeal is taken, or because an appeal is taken and the judgment is affirmed -- subdivision (a) makes it forever binding and conclusive on all matters that were adjudicated, or that could have been adjudicated, in the action. That conclusiveness runs against the agency and against everyone else, and the judgment permanently enjoins anyone from later starting an action or proceeding that raises an issue the judgment already resolved. The statute says this binding effect holds notwithstanding other provisions of law, including the ordinary relief-from-judgment mechanisms of §§ 473 and 473.5.

Subdivision (b) tightens the appeal window sharply compared to ordinary civil cases. Regardless of what § 901 or any court rule might otherwise allow, no appeal from a validation judgment is permitted unless a notice of appeal is filed within 30 days after notice of entry of judgment -- or within 30 days after entry itself, if there is no answering party. And when there is no answering party, the appeal is narrowed further: only issues about the court's jurisdiction to enter the judgment can be raised.

Together, these rules explain why public agencies value validation actions. A bond or contract that survives this process comes with a judgment that is about as close to bulletproof as California law allows -- final quickly, binding broadly, and difficult to reopen.