Krause said about 1.5 million gallons of water from the main break discharged with some of that making its way into nearby Blieders Creek and from there flowed into the Comal River. "Unfortunately, the chlorine in the potable water did cause that fish kill," she said. "We are working with a biologist from the Texas Parks and Wildlife Department. He's been assessing the situation. We also contacted the Texas Commission on Environmental Quality, and we're working with them. We're here to do whatever is necessary to help with the recovery process." NBU officials said aging infrastructure was the cause of the water main break.