How long must a new tank be disinfected before sampling for coliform analysis?

The recommended duration for disinfecting a new tank before sampling for coliform analysis is 24 hours. This timeframe allows for adequate contact time between the disinfectant and the surfaces of the tank, ensuring the effective elimination of any bacteria or pathogens that may be present. Disinfection is a crucial step in water treatment processes, as it helps ensure the safety of the water supply and minimizes the risk of contamination that can lead to public health concerns.

By allowing for 24 hours of disinfection, operators can effectively neutralize harmful microorganisms while ensuring the integrity of the water system is maintained. Sampling too soon after disinfection could result in inaccurate readings, as residual disinfectant or insufficient removal of pathogens could skew the results. Therefore, this 24-hour period is a standard practice that ensures reliability when conducting coliform analysis.