Ark. Code Ann. § 14-89-1202

When any municipal street or water improvement district has fully retired and paid out the bonded indebtedness of the district and there remains a surplus of money derived from the collection of benefit assessments levied against the real property in the district for the purpose of retiring the bonds or funds derived from the sale of unredeemed real property acquired by the district, the surplus funds may be refunded to the property owners of the district pro rata by the board of improvement of the district.