In Southern California, the Cucamonga Valley Water District is informing customers of a data breach that might have put their credit card information at risk.

Water district officials said a server operated by outside vendor Central Square, which the water district uses to collect one-time credit card payments, was breached by an unauthorized third party from Aug. 26 to Oct. 14 this year. The information exposed in the breach includes credit card payment information and possibly other personal information. The number of records comprised in the breach is unknown, however not all customers were affected, officials said.

The water district is “re-evaluating” its relationship with Central Square as officials investigate the breach. In the meantime, Central Square is offering water district customers a year-long subscription for credit and identity theft monitoring as a precaution.

Water district customers affected by the breach will be notified by mail and receive additional details, officials said.