What should a water purveyor do to control cross-connections and protect their public water systems against backflow?
A water purveyor should ensure that a proper backflow preventer is installed and maintained at the water service connection to each system or premises that poses a hazard to the public water system (premise isolation). Generally, this would include water service connections to each dedicated fire protection system or irrigation piping system; premises with an auxiliary or reclaimed water system; industrial, medical, laboratory, marine or other facilities where objectionable substances are handled in a way that could cause pollution or contamination of the public water system; premises exempt from Part 7 (Plumbing) of the Ontario Building Code and premises where an internal backflow preventer required under the Ontario Building Code is not properly installed or maintained; classified or restricted facilities; and tall buildings. Zone protection within a facility may be required in addition to premise isolation, a requirement in order to protect users of the facility.
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- Why do water suppliers need to control cross-connections and protect their public water systems against backflow?
