Why do water purveyors need to control cross-connections and protect their public water systems against backflow?
Backflow into a public water system can pollute or contaminate the water in that system. The hazard created by backflow is generally identified in three groups: severe or high, moderate and minor. A severe hazard is likely to result in serious injury or death while a minor hazard may simply affect the colour, odour or taste of the water with little or no health affects. Each water purveyor has a responsibility to provide water that is usable and safe to drink under all foreseeable circumstances. Further, the expectation of the public is that water quality supplied by the water purveyor is potable and safe to use and it will remain so regardless of its use. For these reasons, each water purveyor must take reasonable precautions to protect its public water system against backflow.
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