Tex. Water Code § 55.652

When necessary, the board shall apportion and assess the benefits conferred on property in the district and shall make a record showing the amount and value of benefits to accrue on property in the district and the amount of taxes to be levied and collected on the property. No taxes assessed or adjudged against the property may be more than the benefit which accrues to the property from the organization, operation, and maintenance of the district and its improvements.