If a dual water distribution system is used, the non potable water system shall be ____ and _____ identified

If a dual water distribution system is used, the non potable water system shall be ____ and _____ identified

• A. Legibly and clearly identified
• B. Durably and adequately identified
• C. Permanently and visibly identified
• D. Rapidly and permanently identified

Answer: (B)

When a dual water distribution system is used, the non-potable portion must be marked so it stays recognizable and cannot be mistaken for potable water over the life of the installation. Markings need to be durable, meaning they resist wear, moisture, and cleaning, so they remain readable for as long as the system is in service. They also need to be adequate, meaning they convey enough information and are placed where they’ll be seen by anyone who might work with the system. This combination helps prevent cross-connection and accidental drinking, even as parts wear or environments change. Readability alone isn’t enough if the markings fade; and phrases implying rapid or overly rigid marking don’t fit the practical, long-term requirement.

When a dual water distribution system is used, the non-potable portion must be marked so it stays recognizable and cannot be mistaken for potable water over the life of the installation. Markings need to be durable, meaning they resist wear, moisture, and cleaning, so they remain readable for as long as the system is in service. They also need to be adequate, meaning they convey enough information and are placed where they’ll be seen by anyone who might work with the system. This combination helps prevent cross-connection and accidental drinking, even as parts wear or environments change. Readability alone isn’t enough if the markings fade; and phrases implying rapid or overly rigid marking don’t fit the practical, long-term requirement.