CWEA GRADE 1 LAB ANALYST EXAM
STUDY GUIDE 2025/2026 COMPLETE
QUESTIONS AND ANSWERS
Which of the following best describes the interpretation for total coliform and E
coli for the enzyme-substrate test?
The presence of fluorescence is a positive test for E. coli. If the chromogen intensifies,
the sample is total-coliform positive.
What is a Grab sample?
Single samples collected at a specific spot at a site over a short period of time (not to
exceed 15 min)
A sample is in a person's custody if it is:
In the individual's physical possession, sight, secured and tampered proof by that
individual, or secured in an area restricted to authorized personnel
What should sample labels include?
Unique sample number, sample type, name of the collector, date and time of collection,
place of collection, and sample preservative
Sample seals should include
Sample number that is identical to sample label, collector's name, date and time of
sampling. Attach so it must be broken to open sample container.
STUDY GUIDE 2025/2026 COMPLETE
QUESTIONS AND ANSWERS
Which of the following best describes the interpretation for total coliform and E
coli for the enzyme-substrate test?
The presence of fluorescence is a positive test for E. coli. If the chromogen intensifies,
the sample is total-coliform positive.
What is a Grab sample?
Single samples collected at a specific spot at a site over a short period of time (not to
exceed 15 min)
A sample is in a person's custody if it is:
In the individual's physical possession, sight, secured and tampered proof by that
individual, or secured in an area restricted to authorized personnel
What should sample labels include?
Unique sample number, sample type, name of the collector, date and time of collection,
place of collection, and sample preservative
Sample seals should include
Sample number that is identical to sample label, collector's name, date and time of
sampling. Attach so it must be broken to open sample container.
