Florida Water Treatment Plant Operator Exam Practice Test

The Florida Water Treatment Plant Operator Exam Practice Test is designed for candidates preparing for the Florida Class C Drinking Water Treatment Plant Operator examination. It combines exam-style multiple-choice questions, answers, explanations, calculations, practical scenarios, and study guidance to help you build the knowledge and judgment needed for the test. The product includes 750 practice questions and answers.

The questions focus on how a water treatment operator actually evaluates treatment conditions, interprets operating data, troubleshoots equipment, performs calculations, handles safety situations, and makes sound process-control decisions.

How This Florida Water Treatment Plant Operator Practice Test Helps You Prepare

This practice test gives you a structured way to work through the technical subjects and decision-making situations relevant to the Florida Class C examination.

• Practice multiple-choice questions written in an exam-style format
• Work through treatment-plant scenarios rather than relying only on definitions
• Review detailed explanations after every question
• Strengthen water treatment mathematics and unit conversions
• Practice interpreting flow, dose, detention time, loading rate, storage, and chemical-feed calculations
• Review coagulation, flocculation, clarification, filtration, aeration, and disinfection concepts
• Work through equipment troubleshooting and process-control situations
• Practice laboratory sampling, analytical interpretation, and quality-control questions
• Review distribution, reservoir, well-field, softening, corrosion-control, and iron/manganese topics
• Identify weak areas by tracking the questions you miss
• Use the included study-guide notes to reinforce important concepts

The emphasis is on understanding why an answer is correct, not simply memorizing an answer letter. That makes the material useful for both first-time candidates and operators who want a more structured review before testing.

What Is the Florida Water Treatment Plant Operator Exam?

Florida’s Department of Environmental Protection administers the Operator Certification Program for drinking-water treatment plant operators. The Class C treatment-plant examination is a multiple-choice examination with 100 questions and a three-hour time allocation.

Key points candidates should know:

• The examination is for the Florida drinking-water treatment plant operator certification pathway.
• Class C is one of Florida’s treatment-plant operator classifications.
• The current DEP examination overview states that Class A, B, and C treatment-plant examinations contain 100 questions with three hours allocated.
• The examination covers multiple technical and operational subject areas rather than one single treatment process.
• DEP’s current examination information confirms that formula sheets are provided at the examination site for the mathematics portions.
• The examination is administered by computer-based testing through Florida DEP’s testing vendor after examination approval.
• The examination should not be confused with the separate Florida water distribution operator examination.

Florida DEP requires a passing score for the Class C examination, but its current public examination pages do not state a single numeric passing percentage. For that reason, this practice product does not invent or advertise an unsupported passing-score figure.

What Subjects Are Covered on the Florida Class C Exam?

Florida DEP’s Class C drinking-water treatment plant operator subject outline includes a broad range of treatment, operational, laboratory, regulatory, and mathematical subjects.

These areas come directly from the Florida DEP Class C examination subject outline, which means preparation should extend beyond memorizing individual treatment definitions.

What Is Included in This Practice Test?

The product provides a large bank of Florida Class C water treatment practice material covering technical knowledge and practical operator judgment.

You receive:

• 750 multiple-choice practice questions and answers
• Four answer choices for each question
• Correct-answer identification
• Detailed answer explanations
• Explanations of why the other choices are incorrect
• Study-guide notes for reinforcement
• Calculation-based questions
• Troubleshooting scenarios
• Practical treatment-plant situations
• Laboratory and sampling questions
• Equipment and process-control questions
• Safety and security situations
• Florida-specific operator preparation material

The question set is designed to give you repeated exposure to different ways a concept can appear in a multiple-choice examination instead of presenting the same question in slightly different wording.

Florida Class C Exam Eligibility: What Do You Need?

For examination eligibility, Florida DEP currently requires a high-school diploma or equivalent and successful completion of the required DEP-approved training course for the classification and level being taken, with the course completed no more than five years before the examination.

For the Class C license itself, the experience requirement is separate from examination eligibility.

• High-school diploma or equivalent is required.
• A DEP-approved Class C training course is required for examination eligibility.
• The approved course must be within the applicable five-year period.
• Current DEP information allows an applicant to take the examination before obtaining the full mandatory experience required for licensure.
• To obtain a Class C treatment-plant operator license, DEP lists 2,080 hours, or one year, of appropriate operational experience.
• The experience requirement for licensure should not be confused with the eligibility requirements for sitting for the examination.

Because eligibility rules can change, candidates should verify their individual circumstances with the Florida Department of Environmental Protection before submitting an application.

How to Register for the Florida Water Treatment Plant Operator Exam

The examination process begins with an application to Florida DEP rather than directly scheduling a testing appointment.

The current process includes:

• Complete the appropriate treatment-plant operator examination application.
• Provide the required application fee.
• Provide documentation of the required DEP-approved training.
• Provide the required photograph and educational documentation where applicable.
• Submit the application to DEP for review.
• Wait for the examination approval notification.
• After approval, follow the instructions in the approval letter to schedule the computer-based examination.
• Florida DEP currently lists a $100 examination fee for Treatment Plant Class C applicants.
• There are currently no general application deadlines for submitting an examination application.

DEP states that incomplete applications can result in a notification of deficiencies, so candidates should carefully review the application and supporting documentation before submitting it.

How Is the Florida Class C Exam Scored?

A passing score is required, but Florida DEP’s current public examination information does not provide a numeric passing percentage on the pages reviewed for this product.

• The Class C exam contains 100 multiple-choice questions.
• Three hours are allocated for the Class C examination.
• DEP requires a passing score for Class C licensure.
• The current public DEP examination information does not establish a numeric passing percentage that should be advertised as the current official cutoff.
• Your practice score should therefore be used as a preparation benchmark rather than treated as an official DEP score.

The better goal is to build consistent performance across all major subject areas instead of studying toward a single assumed percentage.

How We Create This Florida Class C Practice Test

The question bank is organized around the Florida Class C treatment-plant examination subject areas and focuses on situations an operator must reason through rather than simply recognize by definition.

The material emphasizes:

• Florida-specific treatment-plant terminology
• Core Class C examination subject areas
• Practical operating situations
• Original question scenarios
• Treatment-process relationships
• Calculation practice
• Equipment troubleshooting
• Laboratory interpretation
• Safety and security judgment
• Process-control decisions
• Detailed explanations that teach the underlying concept

The official Florida examination outline identifies the Class C domains used as the basis for this preparation approach.

This is independent preparation material. It is not an official Florida DEP examination, and the questions should not be interpreted as actual, recalled, leaked, or previously administered examination questions.

How Should You Study for the Florida Water Treatment Plant Operator Exam?

A strong preparation routine should combine technical review with repeated problem-solving.

• Start with the subjects you find most difficult rather than spending all your time on familiar topics.
• Complete practice questions without looking at the answer first.
• Read the explanation even when you answered correctly.
• Keep a list of recurring mistakes.
• Practice calculations until the setup becomes automatic.
• Review why incorrect answer choices fail, especially on scenario questions.
• Study treatment processes as connected systems rather than isolated chapters.
• Revisit source-water changes, coagulation, clarification, filtration, and disinfection together.
• Include equipment and laboratory questions in every study session.
• Use timed practice as the exam approaches.

For mathematics, practice setting up the problem before reaching for the calculator. Florida DEP confirms that formula sheets are provided at the examination site, so becoming familiar with the formulas and knowing which relationship applies is more useful than trying to memorize every formula from scratch.

Florida Water Treatment Math You Should Know

Mathematics is specifically listed in the Class C examination subject outline, and DEP notes that its examinations contain many math questions.

Focus on calculations involving:

• MGD and gpm
• Gallons, cubic feet and volume
• Chemical dose in mg/L
• Pounds per day
• Detention time
• Flow and pump runtime
• Filter loading rates
• Clarifier hydraulic loading
• Percent removal
• Percentage increase or decrease
• Chlorine demand
• Reservoir water balances
• Chemical inventory
• Well production
• Pipe velocity
• Storage duration

For example, if a plant treats 2.0 MGD and applies 3 mg/L of active chemical:

2.0 × 3 × 8.34 = 50.04 lb/day.

The important skill is recognizing which variables belong in the equation and keeping units consistent.

Practical Skills Tested Through the Practice Questions

The question bank goes beyond textbook terminology by presenting situations such as:

• A filter developing abnormal headloss
• A clarifier showing unusual sludge behavior
• A chemical pump delivering less than expected
• An aeration system losing airflow
• A flow meter disagreeing with an independent measurement
• A laboratory QC check failing
• A storage tank showing an unexplained level change
• A distribution restriction appearing after maintenance
• A well showing changing drawdown or recovery
• A source-water characteristic changing after rainfall
• A chemical-storage or handling problem
• A treatment process approaching an established operating limit

These situations help develop the type of process reasoning needed when several answer choices appear technically plausible.

Exam Day Tips for the Florida Class C Test

Use the official examination instructions you receive from Florida DEP and the testing provider as your final authority for testing-center requirements.

For preparation:

• Arrive with enough time to complete the testing-center check-in process.
• Bring the identification and documentation required by the testing provider.
• Read each question carefully before selecting an answer.
• Watch units closely in calculation questions.
• Do not rush through straightforward questions.
• Flag difficult questions mentally or through the testing interface when permitted.
• Avoid changing an answer without a specific reason.
• Use the provided formula sheet efficiently.
• Keep track of time throughout the three-hour session.
• Do not allow one difficult calculation to consume several minutes.

Florida DEP currently states that the examination is computer-based for ordinary applicants after approval and that formula sheets are provided at the examination site.

Common Mistakes to Avoid

Many candidates lose preparation time by studying only the subjects they already understand.

Avoid these habits:

• Memorizing answer letters instead of concepts
• Ignoring mathematics
• Treating all turbidity problems as filtration problems
• Assuming a normal instrument reading is automatically accurate
• Making treatment adjustments without checking process data
• Confusing raw-water conditions with finished-water conditions
• Overlooking alkalinity when studying coagulation
• Ignoring water age and hydraulic conditions in distribution and storage
• Failing to read units in calculation questions
• Choosing an answer because it sounds technically sophisticated
• Skipping explanations after correct answers
• Waiting until the final days to review weak subject areas
• Confusing examination eligibility with the separate requirements for licensure
• Assuming an unofficial website has more current information than Florida DEP

A good practice score is useful only when you understand the questions you missed and why you missed them.

How to Pass the Florida Water Treatment Plant Operator Exam

Build preparation around three goals: technical understanding, calculation accuracy, and practical judgment.

A useful approach is to work through the practice questions in stages:

1. Take a diagnostic set without studying first.
2. Mark the subjects where you miss the most questions.
3. Review the underlying treatment principles.
4. Practice the related calculations separately.
5. Return to scenario-based questions.
6. Repeat difficult domains until your performance becomes consistent.
7. Finish with timed mixed-question sessions.
8. Review mistakes immediately rather than simply recording your score.

Do not rely on memorized answer patterns. The stronger preparation strategy is to understand what changes when flow, water quality, chemical dose, hydraulic conditions, equipment performance, or laboratory results change.

Is the Florida Class C Water Treatment Operator Exam Difficult?

The difficulty depends heavily on your familiarity with treatment processes, calculations, equipment, laboratory concepts, and Florida-specific requirements.

Candidates who prepare only with definitions may struggle when a question presents an operating situation and asks for the most appropriate response. A broader review of process relationships and repeated scenario practice can make those questions easier to analyze.

The most useful preparation is not simply answering more questions. It is learning from every question you miss.

Who Is This Practice Test For?

This material is intended for people preparing for the Florida Class C Drinking Water Treatment Plant Operator examination and for operators who want to strengthen specific treatment-plant knowledge areas.

It can be useful for:

• First-time Class C examination candidates
• Candidates returning to study after an unsuccessful attempt
• Operators reviewing mathematics
• Candidates studying Florida treatment-process terminology
• Operators strengthening equipment troubleshooting skills
• Candidates reviewing laboratory and sampling concepts
• Students preparing alongside an approved training course
• Operators who want mixed practice before the examination

This practice material does not replace any DEP-required training course, official application, licensing requirement, or examination.

Florida Class C Exam Preparation: Official Information to Check

Because examination procedures, fees, forms, and administrative requirements can change, candidates should verify current details with the Florida Department of Environmental Protection before applying or testing.

Florida DEP currently provides official information covering examination eligibility, applications, scheduling, fees, formula sheets, subject areas, and operator certification.

For the most current requirements, use the Florida Department of Environmental Protection Operator Certification Program and its official Examination Application Overview.

Prepare With More Than Memorization

The Florida Class C examination covers the practical side of drinking-water treatment as well as technical knowledge. Use this practice test to work through calculations, treatment-process decisions, equipment problems, laboratory situations, safety issues, and Florida-specific operator concepts in a structured way.

The goal is to walk into the examination understanding how the pieces of a treatment plant fit together—so when a question presents an unfamiliar situation, you can reason through it rather than depend on memorized wording.

Sample Questions and Answers

Question 1. A surface-water treatment plant experiences a sudden increase in raw-water turbidity after a heavy rainfall event. The operator observes that settled-water turbidity has also increased, although the chemical feed pumps appear to be operating normally. Jar testing shows that the existing coagulant dose is no longer producing strong, rapidly settling floc. What should the operator do FIRST?

A. Increase the filter loading rate to compensate for the reduced settling performance.
B. Use current process data and jar-test results to adjust coagulation conditions appropriately.
C. Reduce the backwash frequency so the filters retain more solids.
D. Increase the finished-water chlorine dose until turbidity decreases.

Correct Answer: B

Answer Explanation: Option B is correct because a major change in raw-water quality can alter the chemical conditions required for effective coagulation and floc formation. After rainfall, turbidity, natural organic matter, alkalinity, temperature, and particle characteristics may change significantly. Jar testing provides a controlled way to evaluate the coagulant dose and treatment conditions before making a process adjustment. The operator should evaluate the results along with pH, alkalinity, rapid-mix performance, flocculation, and settling observations. Increasing filter loading or reducing backwashing does not correct poor upstream particle removal and can increase filter breakthrough. Chlorine is a disinfectant, not a substitute for effective turbidity removal. A Class C operator should respond to changing source-water characteristics by controlling the treatment process rather than simply pushing more water through downstream units.

Why the other options are incorrect:

Option A is incorrect because increasing filter loading can worsen particulate breakthrough.

Option C is incorrect because inadequate backwashing can increase headloss and impair filtration.

Option D is incorrect because chlorine does not remove turbidity or repair poor coagulation.

Study Guide:
Review how raw-water changes affect coagulation, flocculation, sedimentation, and filtration.
Know how jar testing is used to evaluate treatment adjustments before changing full-scale chemical doses.

Question 2. A plant operator is checking a conventional treatment process and notices that the water leaving the flocculation basin contains small, fragile particles rather than well-formed floc. The rapid-mix unit is functioning normally, but the flocculation basin has recently been operated at a substantially higher mixing intensity. Which condition is MOST likely responsible?

A. Excessive flocculation mixing is breaking apart developing floc.
B. Insufficient chlorine contact time is preventing floc formation.
C. Excessive filter backwashing is removing settled solids.
D. Low finished-water fluoride is preventing coagulation.

Correct Answer: A

Answer Explanation: Option A is correct because flocculation requires controlled, relatively gentle mixing that encourages destabilized particles to collide and form larger, stronger aggregates. If mixing energy becomes excessive, newly formed floc can shear apart, producing smaller particles that settle poorly and may increase the solids burden on downstream filters. The operator should evaluate the flocculation mixing conditions, detention time, paddle or mixer operation, and the appearance and settling characteristics of the floc. Chlorine contact time occurs later in the treatment process and does not determine whether particles form floc. Fluoride concentration has no role in conventional particle coagulation. Backwashing is a filtration maintenance activity and cannot explain poor floc formation occurring upstream. Process control requires identifying the treatment step where the problem originates.

Why the other options are incorrect:

Option B is incorrect because chlorine contact conditions do not control floc development.

Option C is incorrect because filter backwashing occurs after clarification and does not form floc.

Option D is incorrect because fluoride concentration does not determine coagulation performance.

Study Guide:
Know the difference between rapid mixing and flocculation mixing.
Remember that flocculation requires enough energy for particle contact but not so much that formed floc is destroyed.

Question 3. A water treatment plant receives groundwater containing elevated dissolved iron and manganese. After aeration, the operator observes that the water becomes noticeably colored and particulate material begins forming. What is the PRIMARY treatment objective of aeration in this situation?

A. Remove all dissolved hardness before filtration.
B. Increase alkalinity so chlorine demand is eliminated.
C. Promote oxidation of dissolved constituents so they can subsequently be removed.
D. Convert nitrate into nitrogen gas before disinfection.

Correct Answer: C

Answer Explanation: Option C is correct because aeration can introduce oxygen into water and promote oxidation of certain dissolved substances, including iron and, under appropriate conditions, manganese. Oxidized iron and manganese can form particulate or insoluble compounds that can then be removed through processes such as filtration. The effectiveness of this approach depends on source-water chemistry, pH, oxidation conditions, detention time, and the specific treatment process. Aeration is not primarily a hardness-removal process, and it does not eliminate chlorine demand. Nitrate removal generally requires different treatment technologies and is not accomplished simply by aerating conventional groundwater. The operator should also monitor downstream filters because oxidation can increase the solids loading that filtration must capture.

Why the other options are incorrect:

Option A is incorrect because aeration does not primarily remove dissolved calcium and magnesium hardness.

Option B is incorrect because aeration does not eliminate chlorine demand by increasing alkalinity.

Option D is incorrect because conventional aeration is not a nitrate-removal process.

Study Guide:
Review aeration applications for iron, manganese, gases, and taste-and-odor control.
Understand that oxidation may create particles that require downstream filtration.

Question 4. During routine filter operation, an operator observes that filter effluent turbidity begins rising rapidly shortly after a filter is returned to service following backwashing. The other filters remain stable. The filter was placed back online without an extended ripening period. What is the MOST appropriate operator response?

A. Increase the raw-water flow to the affected filter.
B. Increase finished-water pH immediately.
C. Add additional fluoride to improve particle capture.
D. Investigate filter ripening and consider diverting or otherwise managing the initial effluent until acceptable performance is restored.

Correct Answer: D

Answer Explanation: Option D is correct because a newly backwashed filter may initially produce elevated turbidity while the filter media and filtration conditions stabilize. The operator should follow the plant’s approved operating procedures for filter-to-waste, ripening, or other controls designed to prevent unstable initial effluent from entering finished-water storage or distribution. The operator should also inspect the backwash sequence, media condition, underdrain performance, filtration rate, and valve operation if elevated turbidity persists. Increasing flow can worsen particle breakthrough. Adjusting finished-water pH or fluoride does not address a filter-performance problem. Proper filter operation requires monitoring effluent turbidity and responding promptly when the filter does not produce acceptable water following backwash.

Why the other options are incorrect:

Option A is incorrect because increasing flow can increase hydraulic stress and particle breakthrough.

Option B is incorrect because pH adjustment does not directly correct unstable filter performance.

Option C is incorrect because fluoride has no corrective role in filter ripening.

Study Guide:
Review filter ripening, turbidity monitoring, backwashing, media condition, and filter-to-waste procedures.
Understand why a filter may behave differently immediately after backwashing.

Question 5. A plant disinfects finished water with chlorine. During an afternoon sampling round, the operator measures a free chlorine residual of 0.20 mg/L at the plant effluent and 0.04 mg/L at a distant distribution-system sampling point. Water age and demand have been unusually high. Which interpretation is MOST appropriate?

A. The residual loss indicates that chlorine demand or water age should be investigated.
B. The distribution system is receiving too much fluoride.
C. The plant should immediately stop all chlorination.
D. The lower residual proves that the original plant sample was analyzed incorrectly.

Correct Answer: A

Answer Explanation: Option A is correct because chlorine residual can decrease as disinfectant reacts with substances in the water, deposits, biofilms, pipe materials, or other chlorine-demanding constituents. Longer water age can also contribute to residual loss. The operator should evaluate the pattern of residuals, distribution-system conditions, source-water and finished-water quality, storage turnover, and operational records. Additional investigation should determine whether the observed residual is consistent with established operating requirements and whether corrective action is necessary. A low downstream residual does not automatically prove that the plant sample was wrong, and stopping chlorination would be inappropriate without a controlled operational decision. Fluoride is unrelated to chlorine-residual decay. Proper disinfection management requires evaluating both treatment-plant performance and conditions throughout the distribution system.

Why the other options are incorrect:

Option B is incorrect because fluoride concentration does not explain chlorine-residual decay.

Option C is incorrect because stopping disinfection could create an unacceptable public-health risk.

Option D is incorrect because a difference between locations can legitimately result from disinfectant demand and water age.

Study Guide:
Study chlorine demand, residual decay, water age, contact conditions, and distribution-system monitoring.
Know why disinfectant residual should be evaluated at multiple locations rather than only at the plant.

Question 6. A plant operator calculates the chlorine dose required for a treatment flow of 2.0 MGD. The desired chlorine dose is 3.0 mg/L. Approximately how many pounds of chlorine are required per day?

A. 25.0 lb/day
B. 50.0 lb/day
C. 75.0 lb/day
D. 100.0 lb/day

Correct Answer: B

Answer Explanation: Option B is correct. A standard water-treatment relationship is: pounds per day = flow in MGD × dose in mg/L × 8.34. Therefore, 2.0 MGD × 3.0 mg/L × 8.34 = 50.04 lb/day, which rounds to approximately 50 lb/day. This calculation is fundamental to chemical-feed evaluation because it allows the operator to compare the theoretical chemical requirement with the actual feed-system setting. An operator should also consider the concentration and strength of the chemical being fed when converting the required active chemical dose into a liquid or solution feed rate. The result should be checked against equipment capacity and operating records. Accurate unit handling is essential because an error in flow, dose, or conversion factor can produce a substantially incorrect chemical feed.

Why the other options are incorrect:

Option A is incorrect because it is approximately half the calculated requirement.

Option C is incorrect because it overstates the required chlorine quantity by about 50 percent.

Option D is incorrect because it doubles the appropriate calculated amount.

Study Guide:
Memorize the relationship: lb/day = MGD × mg/L × 8.34.
Practice converting chemical dose, plant flow, solution strength, and feed rates using consistent units.

Question 7. A plant’s finished-water pH has remained relatively stable, but a corrosion-control program begins showing evidence of increased lead and copper release at customer taps. Which operational approach should the operator consider FIRST?

A. Evaluate the corrosion-control process and relevant water-quality parameters rather than assuming pH alone determines corrosion behavior.
B. Increase filter loading to reduce contact time with finished water.
C. Stop all corrosion-control treatment immediately.
D. Increase fluoride concentration until lead and copper release decreases.

Correct Answer: A

Answer Explanation: Option A is correct because corrosion control depends on the interaction of several water-quality characteristics and treatment conditions, not simply finished-water pH. Depending on the treatment program, operators may need to evaluate alkalinity, pH, orthophosphate or other corrosion-control chemicals, source-water characteristics, treatment changes, distribution-system conditions, and monitoring results. Changes in water chemistry can alter the stability of protective scales inside plumbing and distribution piping. Increasing filter loading does not address corrosion chemistry, while stopping an established corrosion-control treatment without evaluating its effect could worsen metal release. Fluoride is not a substitute for an approved corrosion-control strategy. A Class C operator should use process data and monitoring results to determine whether treatment conditions have shifted and whether the corrosion-control process is functioning as intended.

Why the other options are incorrect:

Option B is incorrect because filtration rate does not directly correct corrosion-control chemistry.

Option C is incorrect because discontinuing treatment without evaluation may increase metal release.

Option D is incorrect because fluoride is not the primary control strategy for lead and copper corrosion.

Study Guide:
Review pH, alkalinity, corrosion-control chemicals, and distribution-system chemistry.
Understand that corrosion control is a water-chemistry and distribution-system issue, not simply a filtration problem.

Question 8. A well field supplies a treatment plant from several production wells. One well suddenly shows a significant increase in turbidity and a change in conductivity compared with its historical operating data. No similar change is observed in the other wells. What should the operator do?

A. Blend the well with all other sources immediately without additional investigation.
B. Increase chlorine feed to hide the change in source-water quality.
C. Investigate the affected well and source-water conditions before relying on it as though its quality were unchanged.
D. Reduce laboratory sampling because the other wells remain normal.

Correct Answer: C

Answer Explanation: Option C is correct because a significant departure from a well’s established water-quality pattern can indicate a source-water or well-field problem that deserves investigation. Possible causes include changes in groundwater conditions, well integrity, pumping conditions, intrusion, equipment problems, or sampling issues. The operator should verify the measurement, review operating records, inspect relevant equipment, and follow the utility’s established source-water response procedures before making the well part of normal production. Simply increasing chlorine does not correct unexplained turbidity or conductivity changes and could mask the need for investigation. Blending without understanding the change can spread a source-water problem into the treatment process. Well-field management requires operators to recognize abnormal source-water conditions and respond before they compromise treatment performance.

Why the other options are incorrect:

Option A is incorrect because blending can distribute an unresolved source-water problem.

Option B is incorrect because chlorine does not correct unexplained source-water changes.

Option D is incorrect because an abnormal individual well requires additional attention rather than less monitoring.

Study Guide:
Review well-field monitoring, source-water characteristics, pumping conditions, and abnormal water-quality responses.
Know the importance of comparing current well data with historical trends.