(a) The commissioners court of a county in the district may petition the board to hold an election in the county to determine if a majority of voters of that county want to exclude the county from the district.
(b) If the district has not issued bonds or incurred other long-term debt before the commissioners court filed the petition, the board shall, on receipt of the petition, enter an order authorizing the commissioners court to call an election in that county.

(c) If the district issued bonds or other long-term debt before the commissioners court filed the petition, the board must obtain adequate legal and financial assurances that, if the county withdraws from the district, the county will assume and pay to the district the county’s proportionate share of the district’s outstanding debt based on assessed valuation of taxable property in the county and district. After obtaining assurances the board considers adequate, the board shall enter an order authorizing the commissioners court of that county to call an election in that county to determine if the county should be excluded from the district.