Reading passage Grades 5–6 English Language Arts
The Night Shift at the Water Treatment Plant
An original informational passage about an overnight treatment plant operator, with eight comprehension questions that mix right-there facts and inference.
Objectives
- Quote accurately from an informational text to support answers.
- Draw inferences that the text supports but does not state directly.
- Explain in writing why a water treatment plant operates around the clock.
Teacher overview
Someone is awake all night at the local treatment plant so that clean water is ready in the morning. This original passage follows an overnight operator through one shift and teaches two things at the same time: the basic sequence of drinking water treatment, told in plain language, and an accurate portrait of a skilled career that begins with a high school diploma and a state license. The comprehension questions move from direct retrieval to inference, matching the way RI.5.1 is assessed.
The passage can be read together or independently. Question 7 asks students to interpret a character's reflection rather than locate a stated fact, and it makes a good whole-class discussion after independent work.
Passage
The Night Shift
At 11 p.m., when most of Milton is asleep, Renee Alvarez clips her badge to her shirt and walks into a building full of quiet humming. She is the night operator at the town's water treatment plant, and for the next eight hours, the water in every faucet in Milton is her responsibility.
The plant never closes. Water does not stop moving through pipes just because people go to bed, and a problem at 2 a.m. matters just as much as a problem at 2 p.m. So operators work in shifts, around the clock, every day of the year, including holidays. "The water doesn't know it's Thanksgiving," Renee likes to say.
Her first stop is the control room, where glowing screens show what the plant is doing. The numbers tell a story to someone who knows how to read them. One screen shows how cloudy the water is — operators call this turbidity — as it moves through the plant. River water comes in carrying bits of mud and leaves too small to see. The plant adds a safe chemical that makes those tiny bits clump together, the clumps settle to the bottom of huge tanks, and then the water passes through deep beds of sand that catch almost everything left. By the time the water leaves the sand filters, it is as clear as glass.
The last step is a small, carefully measured dose of chlorine, which protects the water from germs on its long trip through miles of underground pipes to people's homes.
Around 1 a.m., Renee does what operators call "making rounds." Screens are useful, but operators never fully trust them. She walks the plant with a flashlight, listening. A healthy pump has a smooth, steady sound; a failing one whines or knocks, sometimes days before any screen notices. She checks the tanks, tests a water sample in the lab herself, and writes the results in the log book, the same kind of log that operators before her have kept for fifty years.
At 3 a.m., a storm rolls in. Rain washes mud into the river, and within an hour the incoming water is three times cloudier than it was at midnight. Renee is not surprised, because she saw the weather forecast before her shift and planned for this. She adjusts the chemical dose, slows the plant down slightly to give the clumps more time to settle, and watches her numbers respond. By sunrise, the water leaving the plant is exactly as clean as it was before the storm. No one in Milton will ever know the storm happened, at least not from their faucets.
That, Renee says, is the strange pride of her job: when she does it perfectly, nobody notices anything at all. She learned the work after high school, passed a state test for her operator's license, and has been promoted twice. At 7 a.m., she hands the plant to the day operator, tells him about the storm, and drives home past houses where people are just turning on their taps.
Questions
What is Renee's job, and what time does her shift begin?
According to the passage, why does the plant stay open all night instead of closing when people go to sleep?
What does the word turbidity mean? Quote the phrase from the passage that tells you.
Put the plant's cleaning steps in order: sand filters, settling tanks, chlorine, clumping chemical.
Why does Renee walk through the plant with a flashlight instead of only watching the screens? Use a detail from the passage in your answer.
What happened at 3 a.m., and what two adjustments did Renee make in response?
Renee says the strange pride of her job is that "when she does it perfectly, nobody notices anything at all." What does she mean? Why would her best work be invisible?
Based on the passage, what kind of person would be good at Renee's job? Name two qualities and support each with something Renee does in the text.
Writing task. In one paragraph, explain why a water treatment plant can never simply close for the night. Use at least two facts from the passage.
From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.
Answer Key
Answer: She is the night operator at Milton's water treatment plant, and her shift begins at 11 p.m.
Both details are stated in the first paragraph.Answer: Water keeps moving through the pipes at all hours, and a problem at night matters as much as one during the day.
Students should cite the second paragraph; accept the Thanksgiving quotation as supporting evidence.Answer: How cloudy the water is.
The passage defines it directly: "One screen shows how cloudy the water is — operators call this turbidity." Full credit requires quoting or closely paraphrasing that phrase, since the question asks for the evidence.Answer: Clumping chemical, settling tanks, sand filters, chlorine.
The order appears across paragraphs three and four. Accept the students' own words for each step as long as the sequence is correct.Answer: Because operators never fully trust the screens; some problems can be heard before any screen notices.
The strongest supporting detail is the failing pump that "whines or knocks, sometimes days before any screen notices."Answer: A storm washed mud into the river and made the incoming water three times cloudier; Renee adjusted the chemical dose and slowed the plant down to give the clumps more time to settle.
Both adjustments are required for full credit.Answer: Her job is to prevent problems, so success means everything stays normal — clean water with no interruption — and people only notice water when something goes wrong.
This is an inference question. Accept any answer that captures the idea that invisible success means the system worked; the storm passage (no one "will ever know the storm happened") is the best supporting evidence.Answer: Answers vary; two qualities with text support.
Strong examples: attentive or careful (she makes rounds and tests samples herself rather than trusting screens); prepared or a planner (she checked the forecast before her shift and "planned for this"); calm under pressure (she "is not surprised" by the storm and adjusts methodically); responsible (the whole town's water "is her responsibility"). Any two, each tied to an action from the passage, earn full credit.
Writing task exemplar. A water treatment plant can never close for the night because water never stops moving through the town's pipes, and the plant is what keeps that water safe. The passage says operators work in shifts around the clock, every day of the year, because "the water doesn't know it's Thanksgiving." Problems also arrive on their own schedule: at 3 a.m. a storm made the river water three times cloudier, and an operator had to be there to fix it right away. If the plant were empty at night, no one would have adjusted the chemicals, and dirty water could have reached people's homes by morning.
Differentiation
Support (below grade level)
Read the passage aloud first, then have students reread independently. Provide question stems with paragraph pointers ("Look in the paragraph that begins 'Around 1 a.m.'"). Reduce the set to questions 1 through 5 plus question 7 as a class discussion rather than written work.
Extension (above grade level)
After question 8, pose the reverse inference: what would be hard about this job? (Night hours, holidays, the weight of responsibility, being unnoticed.) Then assign a compare-and-contrast paragraph: how is Renee's kind of importance different from a famous person's kind of importance?
ELL supports
Pre-teach shift, operator, cloudy, settle, and dose with images; act out "making rounds" as a walk-and-listen. The sequencing question (4) works well with cut-apart sentence strips before students write. Accept quoted evidence copied directly from the text, since copying the right quote is the skill being assessed.