Which of the following scenarios is NOT considered a direct cross-connection requiring backflow prevention?

Question: Which of the following scenarios is NOT considered a direct cross-connection requiring backflow prevention?

Answer options:

• A garden hose connected to a utility sink faucet submerged in a pail of soapy water.
• A permanent connection between a potable water line and a non-potable industrial process water line, separated by a fully closed valve.
• The discharge pipe of a water heater connected directly to a sanitary drainage system without an air gap. ✅ A fire suppression system's main supply line drawing from a municipal potable water supply, with no additional connections.

Correct answer: A fire suppression system's main supply line drawing from a municipal potable water supply, with no additional connections.

Explanation: A fire suppression system drawing directly from a municipal potable water supply, without any connections to non-potable sources or substances, is generally considered a potable water supply and not a direct cross-connection requiring immediate backflow prevention against a hazard, although backflow devices are often required for fire systems themselves due to potential stagnancy and chemical treatment. The other options describe clear cross-connections where contaminants could enter the potable supply.