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TCEQ reviews large cross-connection/backflow response after E. coli detections in major Texas system
Summary
TCEQ emergency response and optimization staff described a multi-week response to scattered E. coli positives in a large Texas public water system and urged utilities to maintain cross-connection inspection and backflow-assembly test records.
Charlie Middleton of the Texas Optimization Program and Response Team summarized a recent backflow and cross-connection response that involved a large public water system with more than 80,000 connections and daily demand exceeding 50 million gallons.
"A cross connection is any connection to a water supply with to an unknown quality water source or questionable quality water source," Middleton said, describing how both backpressure and backsiphonage can allow contamination to enter a distribution system and how assemblies and air gaps are used to prevent that.
The nut graf: TCEQ's account of the incident…
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