Many crews will be dispatched from Michigan, and likely other areas to deal with the situation. Homeowners are holed up in all the local hotels. Crews will be accommodated on a cruise ship located in the mouth of the river.
The entire low pressure distribution system will need to be replaced before it is suitable for pressurizing again, per the
NTSB preliminary report.
All customers will need a new service and regulator installed to accommodate the new high pressure mains that will replace the old low pressure mains.
All customer appliances will need to be repaired with new gas valves and regulators, to be suitable for operation again, or replaced.
About 18,000 customers customers affected, according to the CNN article. That's a tall order with winter rapidly approaching. There will be a lot of digging going on.
I suspect that the water utility will be called in to shut of water services, to prevent further home damages while the system is being replaced.
A serious engineering blunder, that will be mighty costly, for not accounting for the regulator sensing lines that controlled the mains pressure...