Texas Government Code 1504.108 – Charges for Services
(a) A municipality shall impose and collect charges for the use of a building or structure described by § 1504.102 and for services provided in connection with that use in amounts at least sufficient to pay:
(1) all operating, maintenance, depreciation, replacement, improvement, and interest charges in connection with the building or structure;
(2) for an interest and sinking fund sufficient to pay any bonds issued to purchase, construct, or improve the building or structure; and
(3) any outstanding debt against the building or structure.
(b) The rates charged for the use of and for services provided in connection with the use of a building or structure described by § 1504.102 must be equal and uniform. A municipality may not allow any free use of or free service in connection with the building or structure except for an activity or institution operated by the municipality.