Florida Drinking Water Operator "B" Practice Test

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At what level are free chlorine residuals typically maintained in a distribution system?

  1. 0.2 mg/l

  2. 0.4 mg/l

  3. 0.6 mg/l

  4. 1.0 mg/l

The correct answer is: 1.0 mg/l

Free chlorine residuals in a distribution system are typically maintained at a level of around 1.0 mg/l to ensure effective disinfection while also preventing microbial growth within the water supply. This concentration serves as a safeguard against pathogens and helps maintain water quality from the treatment plant to the point of consumption. Maintaining free chlorine at this level strikes a balance where sufficient disinfection is achieved without the risk of taste or odor issues becoming prominent. Adequate chlorination also provides a buffer against contamination events in the distribution system. Overall, a free chlorine residual of 1.0 mg/l ensures that the water remains safe for public consumption while adhering to regulatory standards for water quality.

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