Chula Vista, Calif. – Earlier this month, Sweetwater Authority (Authority) received calls from customers in the City of National City regarding discoloration of their drinking water. Upon receiving these calls, staff from the Authority’s Water Quality department deployed staff into the field to perform site investigations at several homes and businesses. An in-depth investigation led staff to find a significant change in system pressure, which was the result of a new water main that was being installed and a zone valve being inadvertently opened. Once this valve was closed, the water discoloration ceased. The Authority is working on continued enhancements to its best management practices to mitigate these types of events from occurring in the future.