INDIANA CERTIFIED OPERATOR
DRINKING WATER CLASS B
Exam Practice Questions
2026-2027 Edition
Verified Answers Plus Rationales
Q&A; | Instant Download PDF
EXAM SPECIFICATIONS
Time Allocation: 3 Hours
Total Questions: 100 Questions
Question Format: Multiple Choice with Rationales
Minimum Competency: 70% Required to Pass
Core Focus: Conventional Treatment, Distribution, Compliance, Indiana Rules
Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
Indiana Class B Water Operator certification covers medium surface water or groundwater systems
serving 3,301-10,000 people. Based on Safe Drinking Water Act, Indiana 327 IAC 8, and IDEM
requirements for conventional treatment, advanced disinfection, distribution management, and
compliance.
CONTENT DISTRIBUTION
• Conventional Treatment (30%) — Coagulation, flocculation, sedimentation, filtration, jar testing,
filter operation
• Disinfection & DBP Control (25%) — Chlorination, chloramination, UV, ozone, CT, DBP
formation, TTHM/HAA5
• Distribution System Management (20%) — Pumps, storage, pressure zones, cross-connection
control, main breaks, flushing
• Regulatory Compliance (15%) — SDWA, SWTR, LT2, Stage 2 DBPR, Lead/Copper Rule, CCR,
sampling plans
• Operations & Safety (10%) — SCADA, emergency response, chemical handling, confined space,
Indiana 327 IAC 8
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes detailed rationale with water standards. IDEM requires 70% to pass Class B
exam.
STUDY STRATEGY
Master conventional treatment and filter operations. Know disinfection CT and DBP formation.
Understand distribution hydraulics and water age. Review SWTR, LT2, Stage 2 DBPR, Lead/Copper
Rule. Study Indiana 327 IAC 8. Practice math: loading rates, detention time, chemical dosing, pump
curves.
CURRICULUM ALIGNMENT
Questions reflect 2026-2027 standards: EPA Safe Drinking Water Act, Indiana 327 IAC 8, IDEM
Drinking Water Branch, AWWA standards, 10 States Standards, Surface Water Treatment Rule, LT2
ESWTR, Stage 2 DBPR.
Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 2
, Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 3
DRINKING WATER CLASS B
Exam Practice Questions
2026-2027 Edition
Verified Answers Plus Rationales
Q&A; | Instant Download PDF
EXAM SPECIFICATIONS
Time Allocation: 3 Hours
Total Questions: 100 Questions
Question Format: Multiple Choice with Rationales
Minimum Competency: 70% Required to Pass
Core Focus: Conventional Treatment, Distribution, Compliance, Indiana Rules
Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
Indiana Class B Water Operator certification covers medium surface water or groundwater systems
serving 3,301-10,000 people. Based on Safe Drinking Water Act, Indiana 327 IAC 8, and IDEM
requirements for conventional treatment, advanced disinfection, distribution management, and
compliance.
CONTENT DISTRIBUTION
• Conventional Treatment (30%) — Coagulation, flocculation, sedimentation, filtration, jar testing,
filter operation
• Disinfection & DBP Control (25%) — Chlorination, chloramination, UV, ozone, CT, DBP
formation, TTHM/HAA5
• Distribution System Management (20%) — Pumps, storage, pressure zones, cross-connection
control, main breaks, flushing
• Regulatory Compliance (15%) — SDWA, SWTR, LT2, Stage 2 DBPR, Lead/Copper Rule, CCR,
sampling plans
• Operations & Safety (10%) — SCADA, emergency response, chemical handling, confined space,
Indiana 327 IAC 8
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes detailed rationale with water standards. IDEM requires 70% to pass Class B
exam.
STUDY STRATEGY
Master conventional treatment and filter operations. Know disinfection CT and DBP formation.
Understand distribution hydraulics and water age. Review SWTR, LT2, Stage 2 DBPR, Lead/Copper
Rule. Study Indiana 327 IAC 8. Practice math: loading rates, detention time, chemical dosing, pump
curves.
CURRICULUM ALIGNMENT
Questions reflect 2026-2027 standards: EPA Safe Drinking Water Act, Indiana 327 IAC 8, IDEM
Drinking Water Branch, AWWA standards, 10 States Standards, Surface Water Treatment Rule, LT2
ESWTR, Stage 2 DBPR.
Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 2
, Indiana Certified Operator Drinking Water Class B Exam Prep 2026-2027 Page 3
