The only defenses to an assessment in a suit to enforce the assessment are that:
(1) the assessment exceeds the amount of the estimated assessment stated in the notice; or
(2) notice of the hearing:
(A) was not mailed, delivered, or published as required by Section 286.007; or
(B) did not contain the information required by Section 286.007.
Official text of the Texas Transportation Code as published by the Texas Legislative Council.