Notice and timing
How delinquency is handled
Grace period after the due date
Bills are due on the 15th. The posted schedule states that payment must be received by 4:30 p.m. the day before the disconnect date to avoid fees; the billing-practices page says late penalties begin within two to four business days after the due date.
Late-fee calculation
Payments not received by the due date are subject to a late-payment penalty within two to four business days. The reviewed current Mustang pages do not publish the exact late-fee dollar amount or percentage.
Disconnection timeline
Mustang states that payment must be received by 4:30 p.m. the day before the disconnect date to avoid fees, but the reviewed public pages do not publish a fixed calendar day count from the 15th due date to physical shutoff.