At what point should fecal coliform samples be tested after collection without preservatives?

Testing fecal coliform samples as soon as possible after collection is essential for obtaining accurate results. The correct timeframe for testing without the use of preservatives is within 4 hours. This is because fecal coliform bacteria can die off or change in concentration over time if samples are not processed swiftly. Delays beyond this window can lead to a significant reduction in the bacterial population, resulting in misleading test results.

Maintaining the integrity of the sample is critical for effective monitoring of water quality and public health. By ensuring that samples are tested within this 4-hour window, operators can achieve a more reliable assessment of fecal contamination in the water, which is vital for effective wastewater management and protection of public health.