Sec. 286.010.  DEFENSES TO ACTIONS FOR ASSESSMENTS.  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.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.