Page 1 of 156
Missouri Advanced Onsite Wastewater Installer
Exam QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
Missouri Advanced Onsite Wastewater Installer Exam
MOSTLY TESTED EXAM COVERAGE AREAS
Missouri Advanced OWTS Registration, Laws, Rules, and Permit Requirements
Advanced installer registration requirements
Relationship between basic and advanced registration
Missouri DHSS requirements and local standards
Permitting, inspections, documentation, and compliance
Advanced-system installation responsibilities (Missouri Health Services)
Site Evaluation, Soil Science, and Limiting Conditions
Soil texture and structure
Seasonal saturation and restrictive layers
Soil morphology
Site slope, landscape position, and setbacks
Hydraulic limitations and loading considerations
Advanced Wastewater Treatment Principles
Treatment objectives
Biological treatment
Aerobic and anaerobic processes
Organic and nutrient reduction
Pretreatment and final treatment
Pressure Distribution Systems
Pumps and dosing tanks
Pressure manifolds
Distribution laterals
Orifices and pressure balancing
Dose volume and dosing frequency
Low-Pressure Pipe (LPP) Systems
LPP design principles
Pressure distribution
Pipe sizing and layout
Orifice placement
Dosing and maintenance
Drip Irrigation Wastewater Systems
Drip tubing and emitters
Filtration
Pressure regulation
Flushing
Zone design and dosing
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Advanced Treatment Units and Components
Aerobic treatment systems
Media filters
Recirculating systems
Disinfection
Pumps, controls, alarms, and tanks
Hydraulics, Wastewater Flow, and Installer Mathematics
Flow calculations
Tank volume
Dosing calculations
Pressure and head
Loading rates and distribution calculations
Construction, Installation, Troubleshooting, and Quality Control
Excavation and trench preparation
Pipe installation
Tank placement
Electrical and mechanical components
System startup and troubleshooting
Operation, Maintenance, Safety, and Environmental Protection
Preventive maintenance
Electrical and confined-space safety
Groundwater protection
Failure identification
Records, inspections, and long-term system performance
QUESTIONS, ANSWERS, AND RATIONALES
1. Which Missouri registration level is specifically required for an installer who wants to install
systems classified by DHSS as advanced onsite wastewater treatment systems?
A. Basic OWTS installer registration
B. Advanced OWTS installer registration
C. Soil evaluator registration
D. Percolation tester registration
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Answer: B
Rationale:
Missouri requires advanced registration for installation of systems designated as advanced OWTS.
Basic registration alone does not authorize installation of advanced systems. (Missouri Health Services)
2. What prerequisite must generally be satisfied before an individual can become registered as a
Missouri advanced OWTS installer?
A. A current basic OWTS installer registration in good standing
B. A wastewater operator license from Missouri
C. A professional engineering license
D. A minimum five-year plumbing license
Answer: A
Rationale:
Missouri's rule requires the applicant to possess basic OWTS installer registration in good standing.
The Advanced Installer Course also identifies completion of the Basic Installer Course as a prerequisite.
(Missouri Health Services)
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3. What minimum examination score is specified for completion of the Missouri advanced OWTS
installer training requirement?
A. 60 percent
B. 65 percent
C. 70 percent
D. 75 percent
Answer: C
Rationale:
Missouri rules specify a score of at least 70 percent for the advanced installer training course.
The registration process also requires completion of the applicable department registration
requirements. (Missouri Health Services)
4. Which subjects are specifically identified by Missouri DHSS as part of the Advanced OWTS Installer
Course?
A. Boiler operations, welding, and electrical contracting
B. Water chemistry, drinking-water treatment, and laboratory analysis
Missouri Advanced Onsite Wastewater Installer
Exam QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
Missouri Advanced Onsite Wastewater Installer Exam
MOSTLY TESTED EXAM COVERAGE AREAS
Missouri Advanced OWTS Registration, Laws, Rules, and Permit Requirements
Advanced installer registration requirements
Relationship between basic and advanced registration
Missouri DHSS requirements and local standards
Permitting, inspections, documentation, and compliance
Advanced-system installation responsibilities (Missouri Health Services)
Site Evaluation, Soil Science, and Limiting Conditions
Soil texture and structure
Seasonal saturation and restrictive layers
Soil morphology
Site slope, landscape position, and setbacks
Hydraulic limitations and loading considerations
Advanced Wastewater Treatment Principles
Treatment objectives
Biological treatment
Aerobic and anaerobic processes
Organic and nutrient reduction
Pretreatment and final treatment
Pressure Distribution Systems
Pumps and dosing tanks
Pressure manifolds
Distribution laterals
Orifices and pressure balancing
Dose volume and dosing frequency
Low-Pressure Pipe (LPP) Systems
LPP design principles
Pressure distribution
Pipe sizing and layout
Orifice placement
Dosing and maintenance
Drip Irrigation Wastewater Systems
Drip tubing and emitters
Filtration
Pressure regulation
Flushing
Zone design and dosing
, Page 2 of 156
Advanced Treatment Units and Components
Aerobic treatment systems
Media filters
Recirculating systems
Disinfection
Pumps, controls, alarms, and tanks
Hydraulics, Wastewater Flow, and Installer Mathematics
Flow calculations
Tank volume
Dosing calculations
Pressure and head
Loading rates and distribution calculations
Construction, Installation, Troubleshooting, and Quality Control
Excavation and trench preparation
Pipe installation
Tank placement
Electrical and mechanical components
System startup and troubleshooting
Operation, Maintenance, Safety, and Environmental Protection
Preventive maintenance
Electrical and confined-space safety
Groundwater protection
Failure identification
Records, inspections, and long-term system performance
QUESTIONS, ANSWERS, AND RATIONALES
1. Which Missouri registration level is specifically required for an installer who wants to install
systems classified by DHSS as advanced onsite wastewater treatment systems?
A. Basic OWTS installer registration
B. Advanced OWTS installer registration
C. Soil evaluator registration
D. Percolation tester registration
, Page 3 of 156
Answer: B
Rationale:
Missouri requires advanced registration for installation of systems designated as advanced OWTS.
Basic registration alone does not authorize installation of advanced systems. (Missouri Health Services)
2. What prerequisite must generally be satisfied before an individual can become registered as a
Missouri advanced OWTS installer?
A. A current basic OWTS installer registration in good standing
B. A wastewater operator license from Missouri
C. A professional engineering license
D. A minimum five-year plumbing license
Answer: A
Rationale:
Missouri's rule requires the applicant to possess basic OWTS installer registration in good standing.
The Advanced Installer Course also identifies completion of the Basic Installer Course as a prerequisite.
(Missouri Health Services)
, Page 4 of 156
3. What minimum examination score is specified for completion of the Missouri advanced OWTS
installer training requirement?
A. 60 percent
B. 65 percent
C. 70 percent
D. 75 percent
Answer: C
Rationale:
Missouri rules specify a score of at least 70 percent for the advanced installer training course.
The registration process also requires completion of the applicable department registration
requirements. (Missouri Health Services)
4. Which subjects are specifically identified by Missouri DHSS as part of the Advanced OWTS Installer
Course?
A. Boiler operations, welding, and electrical contracting
B. Water chemistry, drinking-water treatment, and laboratory analysis
