Sec. 286.009.  APPEAL.  (a)  Not later than the 15th day after the date the commissioners court makes an assessment under Section 286.002, a person who owns or claims an interest in the assessed property may appeal the assessment in district court.  The person may contest:
(1)  the amount of the assessment;
(2)  an inaccuracy, irregularity, invalidity, or insufficiency in a proceeding or contract related to the improvement or assessment;  or
(3)  any other matter that is not in the discretion of the commissioners court.
(b)  A person who does not bring a suit within the time provided by Subsection (a):
(1)  waives the right to contest a matter that might have been heard at the hearing;  and
(2)  is barred and estopped from contesting the assessment or any matter related to the assessment.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.