Business water supplier Aquaflow Utilities is “likely” to enter into liquidation as of midnight on 9th April 2019.
The regulator is advising customers to wait until their new retailer gets in touch so they can provide information about any credit balances.
Businesses are then advised to switch retailers if they wish to do so.
Ofwat added: “We wish to reassure customers that the provision of water and wastewater services to your premises will not be affected.
“Customers do not need to take any action, there are procedures in place to ensure affected customers are allocated a new retailer.”