FLORIDA CLASS C WATER TREATMENT OPERATOR
EXAM| ACTUAL QUESTIONS AND DETAILED
SOLUTIONS 300 SCENARIO-BASED MULTIPLE-CHOICE
QUESTIONS WITH RATIONALES |LATEST UPDATE
2026/2027
1. To obtain a Class "C" water treatment operator license in Florida, how
many hours of on-the-job training are required?
A) 1,040 hours (6 months)
B) 2,080 hours (1 year)
C) 3,120 hours (1.5 years)
D) 4,160 hours (2 years)
Answer B: 2,080 hours (1 year)
Rationale: FDEP requires a minimum of 1 year (2,080 hours) of verifiable water
treatment plant experience before applying for a Class C license .
2. What is the minimum educational requirement to sit for the Florida Class C
exam?
A) Associate's degree in environmental science
B) High school diploma or state-approved GED
C) Bachelor's degree in engineering
D) No formal education required
Answer B: High school diploma or state-approved GED
,Rationale: FDEP requires either a high school diploma or a Florida Department of
Education approved GED. Online GEDs are not accepted .
3. How long is a passing exam grade valid for licensure in Florida?
A) 1 year
B) 2 years
C) 3 years
D) 4 years
Answer D: 4 years
Rationale: A passing exam grade is valid for 4 years for licensure. Applicants must
apply for licensure within this timeframe .
4. The license fee for a Class C water treatment operator is:
A) $25
B) $35
C) $50
D) $75
Answer C: $50
Rationale: The license fee for a Class C water treatment operator is $50. The
application fee is also $50 .
,5. The primary state agency responsible for water treatment operator
certification in Florida is:
A) Florida Department of Health (DOH)
B) Florida Department of Environmental Protection (FDEP)
C) Florida Department of Agriculture
D) Florida Public Service Commission
Answer B: Florida Department of Environmental Protection (FDEP)
Rationale: FDEP is the primary state agency responsible for water treatment
operator certification, licensing, and enforcement in Florida .
6. Which Florida Administrative Code chapter establishes qualifications for
operator licensure?
A) Chapter 62-550
B) Chapter 62-602
C) Chapter 62-604
D) Chapter 62-610
Answer B: Chapter 62-602
Rationale: Florida Administrative Code Chapter 62-602 establishes qualifications
for water and wastewater treatment plant operator licensure .
7. What is the most common indicator of groundwater contamination from
surface runoff?
A) Total dissolved solids (TDS)
, B) Nitrate concentration
C) Turbidity
D) Chloride ion
Answer B: Nitrate concentration
Rationale: Nitrate concentration is the most common indicator of groundwater
contamination from surface runoff, entering from fertilizers, septic systems, and
animal waste .
8. What is the Maximum Contaminant Level (MCL) for nitrate in drinking
water?
A) 1 mg/L
B) 5 mg/L
C) 10 mg/L
D) 20 mg/L
Answer C: 10 mg/L
Rationale: The MCL for nitrate is 10 mg/L as nitrogen, established to protect
against methemoglobinemia (blue baby syndrome) .
9. What is the action level for lead in drinking water?
A) 0.005 mg/L
B) 0.010 mg/L
C) 0.015 mg/L
D) 0.020 mg/L
EXAM| ACTUAL QUESTIONS AND DETAILED
SOLUTIONS 300 SCENARIO-BASED MULTIPLE-CHOICE
QUESTIONS WITH RATIONALES |LATEST UPDATE
2026/2027
1. To obtain a Class "C" water treatment operator license in Florida, how
many hours of on-the-job training are required?
A) 1,040 hours (6 months)
B) 2,080 hours (1 year)
C) 3,120 hours (1.5 years)
D) 4,160 hours (2 years)
Answer B: 2,080 hours (1 year)
Rationale: FDEP requires a minimum of 1 year (2,080 hours) of verifiable water
treatment plant experience before applying for a Class C license .
2. What is the minimum educational requirement to sit for the Florida Class C
exam?
A) Associate's degree in environmental science
B) High school diploma or state-approved GED
C) Bachelor's degree in engineering
D) No formal education required
Answer B: High school diploma or state-approved GED
,Rationale: FDEP requires either a high school diploma or a Florida Department of
Education approved GED. Online GEDs are not accepted .
3. How long is a passing exam grade valid for licensure in Florida?
A) 1 year
B) 2 years
C) 3 years
D) 4 years
Answer D: 4 years
Rationale: A passing exam grade is valid for 4 years for licensure. Applicants must
apply for licensure within this timeframe .
4. The license fee for a Class C water treatment operator is:
A) $25
B) $35
C) $50
D) $75
Answer C: $50
Rationale: The license fee for a Class C water treatment operator is $50. The
application fee is also $50 .
,5. The primary state agency responsible for water treatment operator
certification in Florida is:
A) Florida Department of Health (DOH)
B) Florida Department of Environmental Protection (FDEP)
C) Florida Department of Agriculture
D) Florida Public Service Commission
Answer B: Florida Department of Environmental Protection (FDEP)
Rationale: FDEP is the primary state agency responsible for water treatment
operator certification, licensing, and enforcement in Florida .
6. Which Florida Administrative Code chapter establishes qualifications for
operator licensure?
A) Chapter 62-550
B) Chapter 62-602
C) Chapter 62-604
D) Chapter 62-610
Answer B: Chapter 62-602
Rationale: Florida Administrative Code Chapter 62-602 establishes qualifications
for water and wastewater treatment plant operator licensure .
7. What is the most common indicator of groundwater contamination from
surface runoff?
A) Total dissolved solids (TDS)
, B) Nitrate concentration
C) Turbidity
D) Chloride ion
Answer B: Nitrate concentration
Rationale: Nitrate concentration is the most common indicator of groundwater
contamination from surface runoff, entering from fertilizers, septic systems, and
animal waste .
8. What is the Maximum Contaminant Level (MCL) for nitrate in drinking
water?
A) 1 mg/L
B) 5 mg/L
C) 10 mg/L
D) 20 mg/L
Answer C: 10 mg/L
Rationale: The MCL for nitrate is 10 mg/L as nitrogen, established to protect
against methemoglobinemia (blue baby syndrome) .
9. What is the action level for lead in drinking water?
A) 0.005 mg/L
B) 0.010 mg/L
C) 0.015 mg/L
D) 0.020 mg/L
