OSSF Installer I
OSSF Installer I Exam Study Guide Questions
with Detailed Answers 2025
When did law requiring Installer 1 license go into effect? -Correct Answer ✔March 1,
1990
What is evaporation? -Correct Answer ✔water coming from ground
What is transpiration? -Correct Answer ✔water coming from plants
Are bore holes, injection wells or cesspools legal? -Correct Answer ✔no
Can artesian wells be contaminated from bore holes? -Correct Answer ✔yes
When did license for Installer 2 and Designated Rep go into effect? -Correct Answer
✔1998
Requirements to take Installer 2 class -Correct Answer ✔Installer 1 license for 1 yr and
3 installs or 2 yrs as apprentice plus 6 installs
Does Designated Representative need experience? -Correct Answer ✔No, just course
and test at 70%, but cannot work as installer/designer/evaluator in jurisdiction
Requirements for Site Evaluator -Correct Answer ✔Current Installer 2, DR, Engineer,
Sanitarian, Geoscientist
Requirements for Maintenance Provider -Correct Answer ✔Maintenance Tech for 3
years or Installer 2 plus class
What septic systems require planning by Professional Engineer? -Correct Answer ✔low
pressure dosing, absorptive mounds, soil substitution, secondary treatment, anything
aerobic
What does it mean to alter a septic system? -Correct Answer ✔To change an on-site
sewage facility
Authorization to construct -Correct Answer ✔first part of the permit
Authorized agent -Correct Answer ✔delegated the authority by the executive director to
implement and enforce the rules
OSSF Installer I
, OSSF Installer I
Certified professional soil scientist -Correct Answer ✔individual who has met the
certification requirements of the American Society of Agronomy to engage in the
practice of soil science
Designated representative -Correct Answer ✔An individual who holds a valid license to
review permit applications, site evaluations, or planning materials, or conduct
inspections on on-site sewage facilities.
Floodplain (100-year) -Correct Answer ✔has a 1% chance of flooding each year
Gravel-less drainfield pipe -Correct Answer ✔eight-inch or ten-inch diameter geotextile
fabric-wrapped piping product without gravel or media
Groundwater -Correct Answer ✔Subsurface water occurring in soils and geologic
formations that are fully saturated either year-round or on a seasonal or intermittent
basis
Local governmental entity -Correct Answer ✔municipality, county, river authority, or
special district, including groundwater conservation districts, soil and water conservation
districts, and public health districts
Maintenance -Correct Answer ✔Maintenance does not include alterations
Maintenance provider -Correct Answer ✔Through August 31, 2009, a maintenance
company is a person or business that maintains on-site sewage facilities for
compensation
Malfunctioning OSSF -Correct Answer ✔on-site sewage facility that is causing a
nuisance or is not operating in compliance
On-site sewage disposal system -Correct Answer ✔does not treat more than 5,000
gallons per day, only used for disposal of sewage from site.
Professional engineer -Correct Answer ✔Texas Board of Professional Engineers to
engage in the practice of engineering in the State of Texas
Professional sanitarian -Correct Answer ✔individual registered by the Texas
Department of State Health Services to carry out educational and inspection duties in
the field of sanitation
Recharge feature -Correct Answer ✔Permeable geologic or manmade feature located
on the Edwards Aquifer Recharge Zone, hydrologic interconnectedness and rapid
infiltration can occur
OSSF Installer I
OSSF Installer I Exam Study Guide Questions
with Detailed Answers 2025
When did law requiring Installer 1 license go into effect? -Correct Answer ✔March 1,
1990
What is evaporation? -Correct Answer ✔water coming from ground
What is transpiration? -Correct Answer ✔water coming from plants
Are bore holes, injection wells or cesspools legal? -Correct Answer ✔no
Can artesian wells be contaminated from bore holes? -Correct Answer ✔yes
When did license for Installer 2 and Designated Rep go into effect? -Correct Answer
✔1998
Requirements to take Installer 2 class -Correct Answer ✔Installer 1 license for 1 yr and
3 installs or 2 yrs as apprentice plus 6 installs
Does Designated Representative need experience? -Correct Answer ✔No, just course
and test at 70%, but cannot work as installer/designer/evaluator in jurisdiction
Requirements for Site Evaluator -Correct Answer ✔Current Installer 2, DR, Engineer,
Sanitarian, Geoscientist
Requirements for Maintenance Provider -Correct Answer ✔Maintenance Tech for 3
years or Installer 2 plus class
What septic systems require planning by Professional Engineer? -Correct Answer ✔low
pressure dosing, absorptive mounds, soil substitution, secondary treatment, anything
aerobic
What does it mean to alter a septic system? -Correct Answer ✔To change an on-site
sewage facility
Authorization to construct -Correct Answer ✔first part of the permit
Authorized agent -Correct Answer ✔delegated the authority by the executive director to
implement and enforce the rules
OSSF Installer I
, OSSF Installer I
Certified professional soil scientist -Correct Answer ✔individual who has met the
certification requirements of the American Society of Agronomy to engage in the
practice of soil science
Designated representative -Correct Answer ✔An individual who holds a valid license to
review permit applications, site evaluations, or planning materials, or conduct
inspections on on-site sewage facilities.
Floodplain (100-year) -Correct Answer ✔has a 1% chance of flooding each year
Gravel-less drainfield pipe -Correct Answer ✔eight-inch or ten-inch diameter geotextile
fabric-wrapped piping product without gravel or media
Groundwater -Correct Answer ✔Subsurface water occurring in soils and geologic
formations that are fully saturated either year-round or on a seasonal or intermittent
basis
Local governmental entity -Correct Answer ✔municipality, county, river authority, or
special district, including groundwater conservation districts, soil and water conservation
districts, and public health districts
Maintenance -Correct Answer ✔Maintenance does not include alterations
Maintenance provider -Correct Answer ✔Through August 31, 2009, a maintenance
company is a person or business that maintains on-site sewage facilities for
compensation
Malfunctioning OSSF -Correct Answer ✔on-site sewage facility that is causing a
nuisance or is not operating in compliance
On-site sewage disposal system -Correct Answer ✔does not treat more than 5,000
gallons per day, only used for disposal of sewage from site.
Professional engineer -Correct Answer ✔Texas Board of Professional Engineers to
engage in the practice of engineering in the State of Texas
Professional sanitarian -Correct Answer ✔individual registered by the Texas
Department of State Health Services to carry out educational and inspection duties in
the field of sanitation
Recharge feature -Correct Answer ✔Permeable geologic or manmade feature located
on the Edwards Aquifer Recharge Zone, hydrologic interconnectedness and rapid
infiltration can occur
OSSF Installer I
