Notice and timing
How delinquency is handled
Grace period after the due date
No universal grace-period day count is published on the current payment page. Due dates vary by billing batch; during the 2026 CIS transition the City expressly states that no late fees are being charged, but that transition statement should not be treated as a permanent waiver.
Late-fee calculation
The current City payment page says there are no late fees during the CIS transition period. The reviewed 2026 public pages do not expose a permanent percentage, fixed late charge or interest formula; account-specific delinquency amounts should be confirmed with Customer Service or Grace AI.
Disconnection timeline
A dedicated this detail was not publicly posted. The reviewed current Kingsport pages do not publish a fixed day-by-day schedule from missed due date to physical shutoff. Customers should use the notice/account balance and contact Customer Service at (423) 343-9860 or Grace AI to arrange payment or a plan before the account reaches a service order.