If a dual water distribution system is used, the non potable water system shall be identified in what manner?

If a dual water distribution system is used, the non potable water system shall be identified in what manner?

• A. Temporarily identified
• B. Visible and permanent identification
• C. Durably and adequately identified
• D. Legible and permanent identification

Answer: (C)

In a dual water distribution system, the non-potable portion must be clearly marked so it cannot be mistaken for drinking water. The requirement to identify it durably and adequately means the marking has to last for the life of the system and provide enough information to prevent cross-connection or contamination. Use sturdy, field-proven methods—like durable labels or tags, permanent color coding, and clear signage—placed where they’ll be seen on pipes, valves, and equipment. Relying on temporary or easily faded markings isn’t acceptable because the system remains in service for years and identification needs to endure moisture, cleaning, and wear.

In a dual water distribution system, the non-potable portion must be clearly marked so it cannot be mistaken for drinking water. The requirement to identify it durably and adequately means the marking has to last for the life of the system and provide enough information to prevent cross-connection or contamination. Use sturdy, field-proven methods—like durable labels or tags, permanent color coding, and clear signage—placed where they’ll be seen on pipes, valves, and equipment. Relying on temporary or easily faded markings isn’t acceptable because the system remains in service for years and identification needs to endure moisture, cleaning, and wear.