Texas Septic Installer Licensing Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025 Q&A | Instant
Download Pdf
1. What-is-the-minimum-setback-distance-from-a-private-water-well-to-a-
standard-septic-tank-in-Texas?-a)-25-feet-
b) 50-feet-
c) 100-feet-
d) 150-feet-
Rationale:-Texas-regulations-require-a-100-foot-minimum-distance-
between-a-private-water-well-and-any-component-of-an-OSSF-system-
to-prevent-contamination.-
2. Who-is-responsible-for-obtaining-a-permit-for-the-installation-of-an-OSSF-
system?-
a) Homeowner-
b) Installer-
c) Property-developer-
d) Environmental-health-officer-
Rationale:-The-licensed-installer-is-responsible-for-obtaining-the-proper-
permits-before-installation.-
,3. Which-of-the-following-components-is-part-of-a-conventional-OSSF-
system?-
a) Aerobic-treatment-unit-
b) Septic-tank-
c) Sand-filter-
d) Chlorinator-
Rationale:-A-conventional-system-includes-a-septic-tank-and-a-soil-
absorption-system.-
4. The-trench-bottom-of-a-drain-field-must-be-level-to-within:-
a) 3-inches-per-100-feet-
b) 2-inches-per-100-feet-
c) 6-inches-per-100-feet-
d) 4-inches-per-100-feet-
Rationale:-To-ensure-even-distribution-of-effluent,-the-trench-bottom-
must-be-level-within-2-inches-per-100-feet.-
5. What-is-the-purpose-of-a-distribution-box-in-a-septic-system?-
a) Remove-solids-
b) Distribute-effluent-evenly-
c) Treat-sewage-
d) Store-effluent-
Rationale:-A-distribution-box-ensures-effluent-is-evenly-distributed-to-
the-drain-field-laterals.-
6. Soil-with-what-texture-is-generally-unsuitable-for-a-conventional-
drain-field?-
a) Sandy-loam-
b) Silt-loam-
c) Clay-
d) Loamy-sand-
, Rationale:-Clay-soils-drain-poorly-and-are-generally-unsuitable-for-
conventional-systems-without-modifications.-
7. What-is-the-maximum-daily-flow-allowed-for-a-standard-OSSF-in-
Texas-without-special-approval?-a)-300-gallons-
b) 360-gallons-
c) 500-gallons-
d) 600-gallons-
Rationale:-Systems-handling-more-than-500-gallons/day-typically-
require-engineering-or-advanced-approval.-
8. Which-type-of-system-is-most-appropriate-in-an-area-with-high-
groundwater?-
a) Aerobic-treatment-unit-with-spray-distribution-
b) Conventional-trench-system-
c) Gravel-less-pipe-system-
d) Leaching-pit-
Rationale:-High-groundwater-limits-soil-treatment;-aerobic-units-treat-
wastewater-before-dispersal.-
9. In-Texas,-how-long-is-an-OSSF-installer-license-valid-before-renewal-
is-required?-a)-1-year-
b) 2-years-
c) 3-years-
d) 5-years-
Rationale:-Texas-OSSF-Installer-licenses-must-be-renewed-every-2-
years.-
10. What-agency-regulates-OSSF-Installer-licensing-in-Texas?-
a) EPA-
b) Texas-Commission-on-Environmental-Quality-(TCEQ)-
c) Texas-Department-of-State-Health-Services-
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025 Q&A | Instant
Download Pdf
1. What-is-the-minimum-setback-distance-from-a-private-water-well-to-a-
standard-septic-tank-in-Texas?-a)-25-feet-
b) 50-feet-
c) 100-feet-
d) 150-feet-
Rationale:-Texas-regulations-require-a-100-foot-minimum-distance-
between-a-private-water-well-and-any-component-of-an-OSSF-system-
to-prevent-contamination.-
2. Who-is-responsible-for-obtaining-a-permit-for-the-installation-of-an-OSSF-
system?-
a) Homeowner-
b) Installer-
c) Property-developer-
d) Environmental-health-officer-
Rationale:-The-licensed-installer-is-responsible-for-obtaining-the-proper-
permits-before-installation.-
,3. Which-of-the-following-components-is-part-of-a-conventional-OSSF-
system?-
a) Aerobic-treatment-unit-
b) Septic-tank-
c) Sand-filter-
d) Chlorinator-
Rationale:-A-conventional-system-includes-a-septic-tank-and-a-soil-
absorption-system.-
4. The-trench-bottom-of-a-drain-field-must-be-level-to-within:-
a) 3-inches-per-100-feet-
b) 2-inches-per-100-feet-
c) 6-inches-per-100-feet-
d) 4-inches-per-100-feet-
Rationale:-To-ensure-even-distribution-of-effluent,-the-trench-bottom-
must-be-level-within-2-inches-per-100-feet.-
5. What-is-the-purpose-of-a-distribution-box-in-a-septic-system?-
a) Remove-solids-
b) Distribute-effluent-evenly-
c) Treat-sewage-
d) Store-effluent-
Rationale:-A-distribution-box-ensures-effluent-is-evenly-distributed-to-
the-drain-field-laterals.-
6. Soil-with-what-texture-is-generally-unsuitable-for-a-conventional-
drain-field?-
a) Sandy-loam-
b) Silt-loam-
c) Clay-
d) Loamy-sand-
, Rationale:-Clay-soils-drain-poorly-and-are-generally-unsuitable-for-
conventional-systems-without-modifications.-
7. What-is-the-maximum-daily-flow-allowed-for-a-standard-OSSF-in-
Texas-without-special-approval?-a)-300-gallons-
b) 360-gallons-
c) 500-gallons-
d) 600-gallons-
Rationale:-Systems-handling-more-than-500-gallons/day-typically-
require-engineering-or-advanced-approval.-
8. Which-type-of-system-is-most-appropriate-in-an-area-with-high-
groundwater?-
a) Aerobic-treatment-unit-with-spray-distribution-
b) Conventional-trench-system-
c) Gravel-less-pipe-system-
d) Leaching-pit-
Rationale:-High-groundwater-limits-soil-treatment;-aerobic-units-treat-
wastewater-before-dispersal.-
9. In-Texas,-how-long-is-an-OSSF-installer-license-valid-before-renewal-
is-required?-a)-1-year-
b) 2-years-
c) 3-years-
d) 5-years-
Rationale:-Texas-OSSF-Installer-licenses-must-be-renewed-every-2-
years.-
10. What-agency-regulates-OSSF-Installer-licensing-in-Texas?-
a) EPA-
b) Texas-Commission-on-Environmental-Quality-(TCEQ)-
c) Texas-Department-of-State-Health-Services-
