Question 1
A water analysis report shows hardness of 10 grains per gallon (gpg) as CaCO3. According to WQA classification, this water is:
Correct Answer:
Hard water
Question 2
What pH range is generally considered acceptable for drinking water per EPA secondary standards?
Correct Answer:
6.5 – 8.5
Question 3
Total Dissolved Solids (TDS) is best measured with which instrument?
Correct Answer:
A conductivity meter
Question 4
Which form of iron is soluble in water at the source but oxidizes upon exposure to air?
Correct Answer:
Ferrous iron (Fe2+)
Question 5
A water sample has total hardness of 8 gpg and total alkalinity of 5 gpg (both as CaCO3). What is the estimated carbonate hardness?
Correct Answer:
5 gpg
Question 1
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About this Exam

Prepare with the CSLB C-55 Practice Questions - California CSLB C-55 Water Conditioning Examination Exam practice quiz. This question bank includes 100 questions covering water, softener, brine, treatment, and hardness. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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CSLB C-55 Practice Questions - California CSLB C-55 Water Conditioning Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on water, softener, brine, treatment, and hardness. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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