City Of Dallas issued the following announcement on Nov. 19.
The City of Dallas will be performing system maintenance Friday, Nov. 20, from 10 p.m. to Saturday, Nov. 21 at 1 a.m. You will not be able to process online or telephone payments to Dallas Water Utilities during this time. Please accept our apologies for any inconvenience this may cause you. For alternative Dallas Water Utilities payment locations, please click here. ts/waterutilities/DCH%20Documents/Fidelity_Pay_Stations.pdf
Original source can be found here.