What should be done immediately after taking a potable water sample for testing?

Testing the water sample soon after it is taken is crucial for maintaining the integrity of the sample and ensuring accurate results. Water quality can change over time, and factors such as temperature, light exposure, and contamination can lead to alterations in the sample's chemical and biological properties. By conducting the test promptly, the likelihood of obtaining a true representation of the water's quality increases, thereby allowing for effective evaluation and appropriate action if contaminants are present.

Other options do not align with best practices for water sample handling. Storing the sample in direct sunlight, for instance, can cause changes due to temperature fluctuations and light exposure, leading to degradation of any microorganisms present, which could skew results. Allowing the sample to settle may lead to the loss of suspended particulates that are relevant for analysis. Mixing with chemicals without proper protocol can introduce inaccuracies or contaminate the sample, leading to unreliable test outcomes.