Tennessee-City of Knoxville-Plumbing Contractor Bond ($10,000) The City of Knoxville Plumbing Contractor Surety Bond is required by the City of Knoxville, Tennessee. The Bond amount (Penalty) required for this Bond is $10,000. This Bond indicates the principal has applied for a license to do business as a plumber in the City of Knoxville, Tennessee. Therefore the principal will be expected to faithfully abide by all rules and regulations of the City of Knoxville and all permits for work issued to the principal. The principal will also be expected to comply with all local and state laws.