What should be the third step in the proper order of actions for a new water main installation?

The third step in the proper order of actions for a new water main installation involves disinfection. This step is crucial because it ensures that any harmful bacteria or pathogens that may have entered the water main during installation are eliminated. The disinfection process typically follows the pressure testing phase, where the integrity of the system is checked to ensure that it can hold the required pressure, and occurs before flushing and sampling.

By disinfecting the water main, water system operators protect public health by making certain that the water is safe for consumption. It is vital that this step is undertaken thoroughly to comply with health regulations and standards, as it safeguards against contamination that could pose a risk to users.

The sequence of actions emphasizes that disinfection must occur before flushing, which is intended to remove any residual disinfectant and contaminants, and before collecting bacteriological samples to verify the effectiveness of the disinfection process. This order is fundamental for achieving a safe and reliable water supply.