Texas OSSF DR Certification TEST PRACTICE
Comprehensive Resource To Help You Ace
2026-2027 Includes Frequently Tested
Questions With ELABORATED 100% Correct
COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Which soil textural classes are always unsuitable for standard absorptive OSSF
systems?
A. Class I and II
B. Class II and III
C. Class III and IV
D. Class IA and IV
Correct Answer: D
2. Which of the following lists the major soil horizons?
A. Organic, mineral, bedrock
B. Topsoil, subsoil, rock
C. Surface soil A, surface soil B, parent material
D. A horizon, C horizon, bedrock
Correct Answer: C
3. __________ is the term describing the ability of water to migrate through soil
under __________ or __________ conditions.
A. Permeability; dry; wet
B. Porosity; compacted; loose
,C. Infiltration; gravity; pressure
D. Hydraulic conductivity; saturated; unsaturated
Correct Answer: D
4. Interconnected soil pores allow which two substances to enter the soil and
migrate downward?
A. Nutrients and minerals
B. Heat and pressure
C. Air and water
D. Organics and solids
Correct Answer: C
5. Which list correctly identifies the four components of soil?
A. Sand, silt, clay, rock
B. Oxygen, nitrogen, carbon, hydrogen
C. Water, roots, microbes, minerals
D. Air, water, organics, inorganics
Correct Answer: D
6. A drain field measuring 50 ft by 90 ft must be covered with 15 inches of sand
loam. How many cubic yards are required?
A. 150 cubic yards
B. 180 cubic yards
C. 208.3 cubic yards
D. 250 cubic yards
Correct Answer: C
7. What is the volume of a 5-foot-diameter pump tank that is 5 feet tall with the
inlet 1 foot below the rim?
, A. 450 gallons
B. 520 gallons
C. 587 gallons
D. 650 gallons
Correct Answer: C
8. What is the percent slope of a lot 250 feet deep with a 20-foot elevation
drop?
A. 5%
B. 6%
C. 8%
D. 10%
Correct Answer: C
9. How many cubic yards of gravel are required to fill a ditch 3 ft deep, 10 ft
wide, and 12 ft long with 18 inches of gravel?
A. 4.5 cubic yards
B. 5.8 cubic yards
C. 6.67 cubic yards
D. 8.0 cubic yards
Correct Answer: C
10. A septic tank is 6 ft in diameter and 8 ft deep with the overflow halfway up
from the bottom. What is its capacity?
A. 650 gallons
B. 720 gallons
C. 846 gallons
D. 950 gallons
Correct Answer: C
Comprehensive Resource To Help You Ace
2026-2027 Includes Frequently Tested
Questions With ELABORATED 100% Correct
COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Which soil textural classes are always unsuitable for standard absorptive OSSF
systems?
A. Class I and II
B. Class II and III
C. Class III and IV
D. Class IA and IV
Correct Answer: D
2. Which of the following lists the major soil horizons?
A. Organic, mineral, bedrock
B. Topsoil, subsoil, rock
C. Surface soil A, surface soil B, parent material
D. A horizon, C horizon, bedrock
Correct Answer: C
3. __________ is the term describing the ability of water to migrate through soil
under __________ or __________ conditions.
A. Permeability; dry; wet
B. Porosity; compacted; loose
,C. Infiltration; gravity; pressure
D. Hydraulic conductivity; saturated; unsaturated
Correct Answer: D
4. Interconnected soil pores allow which two substances to enter the soil and
migrate downward?
A. Nutrients and minerals
B. Heat and pressure
C. Air and water
D. Organics and solids
Correct Answer: C
5. Which list correctly identifies the four components of soil?
A. Sand, silt, clay, rock
B. Oxygen, nitrogen, carbon, hydrogen
C. Water, roots, microbes, minerals
D. Air, water, organics, inorganics
Correct Answer: D
6. A drain field measuring 50 ft by 90 ft must be covered with 15 inches of sand
loam. How many cubic yards are required?
A. 150 cubic yards
B. 180 cubic yards
C. 208.3 cubic yards
D. 250 cubic yards
Correct Answer: C
7. What is the volume of a 5-foot-diameter pump tank that is 5 feet tall with the
inlet 1 foot below the rim?
, A. 450 gallons
B. 520 gallons
C. 587 gallons
D. 650 gallons
Correct Answer: C
8. What is the percent slope of a lot 250 feet deep with a 20-foot elevation
drop?
A. 5%
B. 6%
C. 8%
D. 10%
Correct Answer: C
9. How many cubic yards of gravel are required to fill a ditch 3 ft deep, 10 ft
wide, and 12 ft long with 18 inches of gravel?
A. 4.5 cubic yards
B. 5.8 cubic yards
C. 6.67 cubic yards
D. 8.0 cubic yards
Correct Answer: C
10. A septic tank is 6 ft in diameter and 8 ft deep with the overflow halfway up
from the bottom. What is its capacity?
A. 650 gallons
B. 720 gallons
C. 846 gallons
D. 950 gallons
Correct Answer: C
