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LOUISIANA CERTIFIED INSTALLER OF
INDIVIDUAL ONSITE WASTEWATER
TREATMENT SYSTEMS PRACTICE EXAM
— QUESTIONS WITH VERIFIED ANSWERS
AND COMPLETE RATIONALES
## SECTION 1: LOUISIANA SANITARY CODE &
REGULATORY FRAMEWORK
**1. Which Louisiana state agency regulates and licenses
individual onsite wastewater treatment system installers?**
A. Louisiana Department of Environmental Quality (LDEQ)
B. Louisiana Department of Health (LDH), Office of Public
Health (OPH)
C. Louisiana State Licensing Board for Contractors (LSLBC)
D. Louisiana Department of Natural Resources (LDNR)
**Correct answer:** B
**Rationale:** The Louisiana Department of Health (LDH) Office
of Public Health (OPH) Onsite Wastewater Program (OSWW) is
the primary authority regulating onsite wastewater systems in
Louisiana. LDH reviews and approves plans before installation,
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issues installer licenses, and enforces compliance with the
Sanitary Code .
**2. Under Louisiana law, what is the minimum passing score
required on the Onsite Wastewater Installers Workshop
examination?**
A. 60%
B. 65%
C. 70%
D. 75%
**Correct answer:** C
**Rationale:** The Sanitary Code requires a **70% minimum**
on the workshop exam. If the score does not meet this
threshold, the applicant is contacted by the Onsite Wastewater
Program and advised on retaking the exam with a regional
OPH representative. There is no additional charge for retaking
the exam, but passing is required before applying for a license .
**3. How long is the Onsite Wastewater Installers Workshop
training valid before it must be repeated?**
A. 2 years
B. 3 years
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C. 5 years
D. 10 years
**Correct answer:** C
**Rationale:** Training is valid for **five years** (to the end of
the fifth calendar year after taking the class) as per Title 51,
Part 13, Subchapter C, §737.E. Every five years, installers
must retake the installer training class and pass the exam to
avoid interruption of licensure .
**4. Which license is required for the installation and
maintenance of septic tanks with field lines, oxidation ponds,
sand filters, and limited use systems?**
A. Combination License
B. Maintenance License
C. Basic License
D. Homeowner Certification
**Correct answer:** C
**Rationale:** The **Basic License** is required for the
installation and maintenance of septic tanks/field lines, septic
tanks/oxidation ponds, septic tanks/sand filters, and limited use
systems (Title 51, Part 13, Subchapter C, §735.B.2) .
LOUISIANA CERTIFIED INSTALLER OF
INDIVIDUAL ONSITE WASTEWATER
TREATMENT SYSTEMS PRACTICE EXAM
— QUESTIONS WITH VERIFIED ANSWERS
AND COMPLETE RATIONALES
## SECTION 1: LOUISIANA SANITARY CODE &
REGULATORY FRAMEWORK
**1. Which Louisiana state agency regulates and licenses
individual onsite wastewater treatment system installers?**
A. Louisiana Department of Environmental Quality (LDEQ)
B. Louisiana Department of Health (LDH), Office of Public
Health (OPH)
C. Louisiana State Licensing Board for Contractors (LSLBC)
D. Louisiana Department of Natural Resources (LDNR)
**Correct answer:** B
**Rationale:** The Louisiana Department of Health (LDH) Office
of Public Health (OPH) Onsite Wastewater Program (OSWW) is
the primary authority regulating onsite wastewater systems in
Louisiana. LDH reviews and approves plans before installation,
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issues installer licenses, and enforces compliance with the
Sanitary Code .
**2. Under Louisiana law, what is the minimum passing score
required on the Onsite Wastewater Installers Workshop
examination?**
A. 60%
B. 65%
C. 70%
D. 75%
**Correct answer:** C
**Rationale:** The Sanitary Code requires a **70% minimum**
on the workshop exam. If the score does not meet this
threshold, the applicant is contacted by the Onsite Wastewater
Program and advised on retaking the exam with a regional
OPH representative. There is no additional charge for retaking
the exam, but passing is required before applying for a license .
**3. How long is the Onsite Wastewater Installers Workshop
training valid before it must be repeated?**
A. 2 years
B. 3 years
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C. 5 years
D. 10 years
**Correct answer:** C
**Rationale:** Training is valid for **five years** (to the end of
the fifth calendar year after taking the class) as per Title 51,
Part 13, Subchapter C, §737.E. Every five years, installers
must retake the installer training class and pass the exam to
avoid interruption of licensure .
**4. Which license is required for the installation and
maintenance of septic tanks with field lines, oxidation ponds,
sand filters, and limited use systems?**
A. Combination License
B. Maintenance License
C. Basic License
D. Homeowner Certification
**Correct answer:** C
**Rationale:** The **Basic License** is required for the
installation and maintenance of septic tanks/field lines, septic
tanks/oxidation ponds, septic tanks/sand filters, and limited use
systems (Title 51, Part 13, Subchapter C, §735.B.2) .
