What are the acceptable temperature ranges for cold and hot water according to ASSE guidelines?

The acceptable temperature ranges for cold and hot water according to ASSE guidelines are crucial for preventing the growth of Legionella bacteria. The guideline stipulates that cold water should be maintained at temperatures that are relatively low to minimize bacterial proliferation. In this context, the threshold of 65°F or lower effectively helps discourage the growth of opportunistic pathogens, including Legionella, which thrive in warmer conditions.

On the hot water side, the guideline indicates that hot water should be maintained at or above 110°F. At this temperature, the control of Legionella growth is enhanced because the bacteria are less likely to survive and reproduce effectively. Maintaining hot water at this level or higher serves as a critical control point in ensuring a safe plumbing system.

Together, these temperature guidelines play a significant role in the overall management and assessment of water systems to minimize the risk of Legionella contamination and ensure public health safety.