,Missouri Advanced Onsite Wastewater Installer Exam Questions and
Verified Answers with Rationales (JUST RELEASED)
Section A: Missouri Advanced OWTS Registration, Laws, Rules, and Permit Requirements (Questions
1–40)
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. Soil evaluator registration
B. Basic OWTS installer registration
C. Advanced OWTS installer registration
D. Percolation tester registration
Correct Answer: C
Rationale: Missouri requires advanced registration for installation of systems designated as advanced
OWTS. Basic registration alone does not authorize installation of advanced systems. When site
limitations or other factors lead to an advanced OWTS, the installer must be registered as an advanced
OWTS installer.
2. What prerequisite must generally be satisfied before an individual can become registered as a
Missouri advanced OWTS installer?
A. A professional engineering license
B. A wastewater operator license from Missouri
C. A current basic OWTS installer registration in good standing
D. A minimum five-year plumbing license
Correct Answer: C
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.
3. What minimum examination score is specified for completion of the Missouri advanced OWTS
installer training requirement?
A. 60 percent
B. 65 percent
C. 75 percent
D. 70 percent
Correct Answer: D
,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.
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
C. Advanced treatment systems, soils, math, pressure distribution, LPP systems, and drip irrigation
systems
D. Highway construction, bridge design, and traffic engineering
Correct Answer: C
Rationale: The DHSS Advanced OWTS Installer Course covers advanced treatment systems, soils, math,
pressure distribution, low-pressure pipe (LPP) distribution systems, and drip irrigation systems. The
operation of construction equipment is not covered.
5. What is the pre-registration fee for the DHSS Advanced OWTS Installer Course?
A. $100
B. $300
C. $200
D. $500
Correct Answer: C
Rationale: The pre-registration fee for the Advanced OWTS Installer Course is $200.00, which includes a
non-refundable processing fee of $90.00. The course provides 10 Continuing Education Units (CEUs).
6. What is the duration of the DHSS Advanced OWTS Installer Course?
A. One day
B. Three days
C. Two days
D. One week
Correct Answer: C
Rationale: The Advanced OWTS Installer Course is a two-day training course conducted by staff of the
Department of Health and Senior Services (DHSS). An exam is given at the end of the course.
, 7. An individual who is not registered as a basic OWTS installer in good standing must first complete
which course before taking the Advanced OWTS Installer Course?
A. The Licensed Inspector Course
B. The Basic OWTS Installer Course
C. The Soil Evaluator Course
D. The Percolation Tester Course
Correct Answer: B
Rationale: Individuals who are not registered as basic OWTS installers in good standing must first
complete the Basic OWTS Installer Course. The Basic course is a prerequisite for the Advanced course.
8. Where is the DHSS Advanced OWTS Installer Course conducted?
A. Kansas City, Missouri
B. St. Louis, Missouri
C. Springfield, Missouri
D. Jefferson City, Missouri
Correct Answer: D
Rationale: The Advanced OWTS Installer Course is conducted in Jefferson City, Missouri, by staff of the
Department of Health and Senior Services (DHSS).
9. According to Missouri regulations, what score must be achieved on the basic installer training
course?
A. 60% or higher
B. 65% or higher
C. 70% or higher
D. 75% or higher
Correct Answer: C
Rationale: Missouri regulations require a score of seventy percent (70%) or higher on the basic installer
training course. The same 70% standard applies to the licensed inspector training course.
10. What documentation is required to demonstrate successful completion of both the basic installers
training course and licensed inspector training course?
A. A verbal confirmation from the course instructor
B. Documentation of successful completion of both courses
C. A letter from a licensed contractor
D. A notarized affidavit from the applicant
Verified Answers with Rationales (JUST RELEASED)
Section A: Missouri Advanced OWTS Registration, Laws, Rules, and Permit Requirements (Questions
1–40)
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. Soil evaluator registration
B. Basic OWTS installer registration
C. Advanced OWTS installer registration
D. Percolation tester registration
Correct Answer: C
Rationale: Missouri requires advanced registration for installation of systems designated as advanced
OWTS. Basic registration alone does not authorize installation of advanced systems. When site
limitations or other factors lead to an advanced OWTS, the installer must be registered as an advanced
OWTS installer.
2. What prerequisite must generally be satisfied before an individual can become registered as a
Missouri advanced OWTS installer?
A. A professional engineering license
B. A wastewater operator license from Missouri
C. A current basic OWTS installer registration in good standing
D. A minimum five-year plumbing license
Correct Answer: C
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.
3. What minimum examination score is specified for completion of the Missouri advanced OWTS
installer training requirement?
A. 60 percent
B. 65 percent
C. 75 percent
D. 70 percent
Correct Answer: D
,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.
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
C. Advanced treatment systems, soils, math, pressure distribution, LPP systems, and drip irrigation
systems
D. Highway construction, bridge design, and traffic engineering
Correct Answer: C
Rationale: The DHSS Advanced OWTS Installer Course covers advanced treatment systems, soils, math,
pressure distribution, low-pressure pipe (LPP) distribution systems, and drip irrigation systems. The
operation of construction equipment is not covered.
5. What is the pre-registration fee for the DHSS Advanced OWTS Installer Course?
A. $100
B. $300
C. $200
D. $500
Correct Answer: C
Rationale: The pre-registration fee for the Advanced OWTS Installer Course is $200.00, which includes a
non-refundable processing fee of $90.00. The course provides 10 Continuing Education Units (CEUs).
6. What is the duration of the DHSS Advanced OWTS Installer Course?
A. One day
B. Three days
C. Two days
D. One week
Correct Answer: C
Rationale: The Advanced OWTS Installer Course is a two-day training course conducted by staff of the
Department of Health and Senior Services (DHSS). An exam is given at the end of the course.
, 7. An individual who is not registered as a basic OWTS installer in good standing must first complete
which course before taking the Advanced OWTS Installer Course?
A. The Licensed Inspector Course
B. The Basic OWTS Installer Course
C. The Soil Evaluator Course
D. The Percolation Tester Course
Correct Answer: B
Rationale: Individuals who are not registered as basic OWTS installers in good standing must first
complete the Basic OWTS Installer Course. The Basic course is a prerequisite for the Advanced course.
8. Where is the DHSS Advanced OWTS Installer Course conducted?
A. Kansas City, Missouri
B. St. Louis, Missouri
C. Springfield, Missouri
D. Jefferson City, Missouri
Correct Answer: D
Rationale: The Advanced OWTS Installer Course is conducted in Jefferson City, Missouri, by staff of the
Department of Health and Senior Services (DHSS).
9. According to Missouri regulations, what score must be achieved on the basic installer training
course?
A. 60% or higher
B. 65% or higher
C. 70% or higher
D. 75% or higher
Correct Answer: C
Rationale: Missouri regulations require a score of seventy percent (70%) or higher on the basic installer
training course. The same 70% standard applies to the licensed inspector training course.
10. What documentation is required to demonstrate successful completion of both the basic installers
training course and licensed inspector training course?
A. A verbal confirmation from the course instructor
B. Documentation of successful completion of both courses
C. A letter from a licensed contractor
D. A notarized affidavit from the applicant
