Landscaping License Practice Test

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What color is used for the piping in a nonpotable irrigation system?

  1. Green

  2. Red

  3. Blue

  4. Purple

The correct answer is: Purple

In a nonpotable irrigation system, purple piping is used to clearly designate recycled or reclaimed water that is not safe for drinking. This color coding is vital for public health and safety, as it helps prevent the accidental use of nonpotable water for purposes like drinking or cooking. The use of purple for nonpotable water systems is recognized by many plumbing codes and regulations, making it a universal standard in the landscape and irrigation industry. This distinct color helps ensure that those working on or around irrigation systems can easily identify the type of water utilized, protecting both people and the environment.

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