INDIANA CERTIFIED OPERATOR
DRINKING WATER CLASS A
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: Advanced Treatment, Management, Compliance, Indiana Rules
Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
Indiana Class A Water Operator certification covers large surface water or groundwater systems
serving over 10,000 people. Based on Safe Drinking Water Act, Indiana 327 IAC 8, IDEM
requirements for advanced treatment, membrane systems, distribution management, regulatory
compliance, and system management.
CONTENT DISTRIBUTION
• Advanced Treatment Processes (30%) — Membrane filtration, UV, ozone, GAC, softening,
corrosion control, enhanced coagulation
• Distribution System Management (25%) — Hydraulic modeling, pressure zones, storage, pump
stations, water age, asset management
• Regulatory Compliance (25%) — SDWA, SWTR, LT2, Stage 2 DBPR, Lead/Copper, RTCR,
UCMR, CCR, sanitary surveys
• Water Quality & Laboratory (10%) — TOC, DBP precursors, emerging contaminants, analytical
methods, QA/QC
• Management & Safety (10%) — Budgeting, personnel, emergency response, security, Indiana 327
IAC 8, public relations
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes detailed rationale with advanced water standards. IDEM requires 70% to
pass Class A exam.
STUDY STRATEGY
Master advanced treatment: membranes, UV, ozone. Know distribution management and water
quality modeling. Understand complex regulations: LT2, Stage 2 DBPR, LCRR. Review Indiana 327
IAC 8. Study system management, budgeting, and emergency planning. Practice advanced math:
pump curves, CT calculations, loading rates.
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, LT2 ESWTR, Stage 2 DBPR, Lead
and Copper Rule Revisions.
Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 2
, Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 3
DRINKING WATER CLASS A
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: Advanced Treatment, Management, Compliance, Indiana Rules
Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 1
, Exam Overview & Content Outline
EXAM PURPOSE
Indiana Class A Water Operator certification covers large surface water or groundwater systems
serving over 10,000 people. Based on Safe Drinking Water Act, Indiana 327 IAC 8, IDEM
requirements for advanced treatment, membrane systems, distribution management, regulatory
compliance, and system management.
CONTENT DISTRIBUTION
• Advanced Treatment Processes (30%) — Membrane filtration, UV, ozone, GAC, softening,
corrosion control, enhanced coagulation
• Distribution System Management (25%) — Hydraulic modeling, pressure zones, storage, pump
stations, water age, asset management
• Regulatory Compliance (25%) — SDWA, SWTR, LT2, Stage 2 DBPR, Lead/Copper, RTCR,
UCMR, CCR, sanitary surveys
• Water Quality & Laboratory (10%) — TOC, DBP precursors, emerging contaminants, analytical
methods, QA/QC
• Management & Safety (10%) — Budgeting, personnel, emergency response, security, Indiana 327
IAC 8, public relations
QUESTION FORMAT & SCORING
Each item presents four options. Correct answers are highlighted in green with checkmark (✓).
Every question includes detailed rationale with advanced water standards. IDEM requires 70% to
pass Class A exam.
STUDY STRATEGY
Master advanced treatment: membranes, UV, ozone. Know distribution management and water
quality modeling. Understand complex regulations: LT2, Stage 2 DBPR, LCRR. Review Indiana 327
IAC 8. Study system management, budgeting, and emergency planning. Practice advanced math:
pump curves, CT calculations, loading rates.
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, LT2 ESWTR, Stage 2 DBPR, Lead
and Copper Rule Revisions.
Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 2
, Indiana Certified Operator Drinking Water Class A Exam Prep 2026-2027 Page 3
