What color coding is designated for non-potable water?

Non-potable water is color-coded with a yellow background and black uppercase letters to clearly indicate that the water is unsuitable for drinking and may pose health risks. This standardization helps ensure that anyone working around plumbing or irrigation systems can quickly identify and avoid using this type of water for potable purposes. The choice of yellow is particularly effective due to its high visibility, alerting individuals to the potential hazard associated with the water source.

Using uppercase letters in black further enhances readability and ensures that the warning is unmistakable, reinforcing safety protocols in both residential and commercial environments. Such color coding is part of broader safety and compliance regulations, aiming to reduce accidents and clarify the use of various water sources.