Practice Test GeeksNEHA - National Environmental Health Association Practice Test
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Water Quality Flashcards

5 cards from real NEHA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 5 Water Quality flashcards as text

  1. Which of the following is the most common method used to disinfect drinking water?

    Answer: Chlorination

    Chlorination is the most widely used method to disinfect drinking water, killing bacteria, viruses, and other pathogens.

  2. What is the maximum contaminant level (MCL) for lead in drinking water according to the U.S. Environmental Protection Agency (EPA)?

    Answer: 0.015 mg/L

    The EPA's MCL for lead in drinking water is 0.015 mg/L (15 parts per billion) to protect against the harmful effects of lead exposure.

  3. What does pH measure in water quality?

    Answer: The acidity or alkalinity of water

    pH is a measure of how acidic or basic (alkaline) water is, with values ranging from 0 (most acidic) to 14 (most basic).

  4. Which of the following contaminants is often responsible for causing algal blooms in water bodies?

    Answer: Nitrates and phosphates

    High levels of nitrates and phosphates in water can cause excessive algae growth, leading to harmful algal blooms and water quality issues.

  5. What is the main health concern associated with high levels of nitrates in drinking water?

    Answer: Blue baby syndrome (methemoglobinemia)

    High nitrate levels in drinking water can reduce the oxygen-carrying capacity of blood in infants, leading to blue baby syndrome.

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Sources & references

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  1. neha.org — Test delivery, exam format, passing score, registration deadline, renewal, retake policy, score release, score validity · verified Oct 2026
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