TEEX Basic Water Works Operations Practice Test

There isn’t a universal 36-hour deadline for delivering samples to the lab. Hold times are specific to each test method and can depend on the type of sample, how it’s preserved, and the testing procedure. Some analyses must be started within a short window (often within 24 hours for many bacteriological tests), while others may allow longer holding if proper preservation is used. If the hold time is exceeded or the sample isn’t preserved correctly, the results can be invalid or the sample rejected. So the statement isn’t universally true.