(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.
Official text of the Texas Transportation Code as published by the Texas Legislative Council.