What is a Treatment Technique violation related to the TCR?

A Treatment Technique violation related to the Total Coliform Rule (TCR) specifically involves failing to conduct required assessments within a specified timeframe. The TCR establishes standards for monitoring the presence of coliform bacteria in drinking water, which are indicators of potential contamination. When a water system does not complete the necessary assessments, whether it's routine sampling or follow-up testing after a detection of coliform presence, it compromises the safety and quality of the water supply. Timely assessments are vital for ensuring that any contamination is identified and addressed quickly, thus protecting public health.

The other options, while relating to water treatment and safety, do not capture the specific nature of what constitutes a Treatment Technique violation as defined by the TCR. Using outdated monitoring technologies and failing to identify sources of contamination are important issues, but they do not fit within the specific framework that defines a treatment technique violation. Exceeding acceptable levels of chlorine generally pertains to Maximum Contaminant Level (MCL) violations rather than treatment technique violations, which focus more on operational processes and methodologies rather than specific contaminant concentrations.