Oklahoma Certified Installer Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of an on-site sewage treatment
system (OSTS)?
A) Increase property value
B) Safely treat and dispose of wastewater on the property
C) Prevent groundwater recharge
D) Eliminate all bacteria from wastewater
Answer: B
Rationale: The main objective of an OSTS is to treat and dispose of
domestic wastewater safely and protect public health and the
environment.
2. Which type of wastewater requires proper treatment because of
high organic content and potential pathogens?
A) Stormwater runoff
B) Greywater from laundry
C) Domestic wastewater
D) Industrial wastewater
Answer: C
Rationale: Domestic wastewater typically contains high levels of
organic matter, nutrients, and pathogens requiring treatment
before disposal.
,3. Improper disposal of wastewater can lead to:
A) Improved soil fertility
B) Groundwater contamination
C) Reduced water usage
D) Enhanced biodiversity
Answer: B
Rationale: If wastewater is not properly treated and disposed,
contaminants may leach into groundwater, posing health risks.
4. The Oklahoma Department of Environmental Quality (DEQ) is
responsible for:
A) Monitoring air quality only
B) Regulating on-site sewage treatment systems
C) Managing municipal water supplies
D) Overseeing industrial waste disposal only
Answer: B
Rationale: In Oklahoma, DEQ has regulatory oversight for on-site
sewage treatment and disposal systems (OSTS) among other
duties.
5. As a certified installer, one of your liabilities is:
A) Designing systems without permits
B) Ensuring compliance with DEQ regulations
C) Ignoring site evaluation results
D) Avoiding site inspections
Answer: B
Rationale: Certified installers must ensure that installations comply
with applicable regulations and standards; failing to do so can
lead to liability.
,6. A “repair area” in an OSTS installation refers to:
A) Where new systems are installed
B) A designated zone for system repairs to prevent damage to the
rest of the property
C) A storage zone for spare parts
D) A location for abandoning old systems
Answer: B
Rationale: The repair area is reserved so that if the primary field
fails, repair work can be done without disrupting the main system
or landscape.
7. In determining setback distances for an absorption field, which
factor is most important?
A) Proximity to the street
B) Distance from a potable water well
C) Landscaping aesthetics
D) Property line only
Answer: B
Rationale: A key purpose of setbacks is to protect potable water
sources (e.g., wells) by maintaining sufficient separation to
prevent contamination.
8. To obtain initial certification as an OSTS installer in Oklahoma, an
applicant must:
A) Have at least 5 years of experience
B) Submit proof of experience and pass a certification exam
C) Complete a 2-week training course only
D) Be a licensed engineer
Answer: B
, Rationale: Applicants typically must document relevant experience
and successfully complete the installer exam to become certified.
9. What is the required documentation often needed as part of the
surety bond or financial assurance for certified installers?
A) Personal bank statement
B) Proof of liability insurance
C) Previous installation receipts
D) Business license
Answer: B
Rationale: Liability insurance or a surety bond ensures the installer
is financially capable of addressing potential errors or system
failures.
10. Renewal of installer certification generally requires:
A) No additional requirements after initial certification
B) Payment of renewal fee only
C) Continuing education hours and renewal fee
D) Re-examination every 10 years
Answer: C
Rationale: Most certification programs mandate continuing
education to ensure installers stay current with best practices and
pay a renewal fee.
11. A soil characteristic indicative of good absorption capacity
for an OSTS is:
A) Heavy clay texture
B) Sandy loam with good permeability
C) Dense mottled subsoil
D) Shallow bedrock
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of an on-site sewage treatment
system (OSTS)?
A) Increase property value
B) Safely treat and dispose of wastewater on the property
C) Prevent groundwater recharge
D) Eliminate all bacteria from wastewater
Answer: B
Rationale: The main objective of an OSTS is to treat and dispose of
domestic wastewater safely and protect public health and the
environment.
2. Which type of wastewater requires proper treatment because of
high organic content and potential pathogens?
A) Stormwater runoff
B) Greywater from laundry
C) Domestic wastewater
D) Industrial wastewater
Answer: C
Rationale: Domestic wastewater typically contains high levels of
organic matter, nutrients, and pathogens requiring treatment
before disposal.
,3. Improper disposal of wastewater can lead to:
A) Improved soil fertility
B) Groundwater contamination
C) Reduced water usage
D) Enhanced biodiversity
Answer: B
Rationale: If wastewater is not properly treated and disposed,
contaminants may leach into groundwater, posing health risks.
4. The Oklahoma Department of Environmental Quality (DEQ) is
responsible for:
A) Monitoring air quality only
B) Regulating on-site sewage treatment systems
C) Managing municipal water supplies
D) Overseeing industrial waste disposal only
Answer: B
Rationale: In Oklahoma, DEQ has regulatory oversight for on-site
sewage treatment and disposal systems (OSTS) among other
duties.
5. As a certified installer, one of your liabilities is:
A) Designing systems without permits
B) Ensuring compliance with DEQ regulations
C) Ignoring site evaluation results
D) Avoiding site inspections
Answer: B
Rationale: Certified installers must ensure that installations comply
with applicable regulations and standards; failing to do so can
lead to liability.
,6. A “repair area” in an OSTS installation refers to:
A) Where new systems are installed
B) A designated zone for system repairs to prevent damage to the
rest of the property
C) A storage zone for spare parts
D) A location for abandoning old systems
Answer: B
Rationale: The repair area is reserved so that if the primary field
fails, repair work can be done without disrupting the main system
or landscape.
7. In determining setback distances for an absorption field, which
factor is most important?
A) Proximity to the street
B) Distance from a potable water well
C) Landscaping aesthetics
D) Property line only
Answer: B
Rationale: A key purpose of setbacks is to protect potable water
sources (e.g., wells) by maintaining sufficient separation to
prevent contamination.
8. To obtain initial certification as an OSTS installer in Oklahoma, an
applicant must:
A) Have at least 5 years of experience
B) Submit proof of experience and pass a certification exam
C) Complete a 2-week training course only
D) Be a licensed engineer
Answer: B
, Rationale: Applicants typically must document relevant experience
and successfully complete the installer exam to become certified.
9. What is the required documentation often needed as part of the
surety bond or financial assurance for certified installers?
A) Personal bank statement
B) Proof of liability insurance
C) Previous installation receipts
D) Business license
Answer: B
Rationale: Liability insurance or a surety bond ensures the installer
is financially capable of addressing potential errors or system
failures.
10. Renewal of installer certification generally requires:
A) No additional requirements after initial certification
B) Payment of renewal fee only
C) Continuing education hours and renewal fee
D) Re-examination every 10 years
Answer: C
Rationale: Most certification programs mandate continuing
education to ensure installers stay current with best practices and
pay a renewal fee.
11. A soil characteristic indicative of good absorption capacity
for an OSTS is:
A) Heavy clay texture
B) Sandy loam with good permeability
C) Dense mottled subsoil
D) Shallow bedrock
