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Exam (elaborations)

OSSF DR UPDATED 2026 EXAM SCRIPT QUESTIONS AND SOLUTIONS SCORED

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OSSF DR UPDATED 2026 EXAM SCRIPT QUESTIONS AND SOLUTIONS SCORED

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OSSF
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OSSF

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OSSF DR UPDATED 2026 EXAM SCRIPT QUESTIONS AND
SOLUTIONS SCORED A+
✔✔How must drainfield trenches be installed? - ✔✔Level

✔✔Should drainfield trenches be sloped? - ✔✔No

✔✔What is the standard gravity pipe slope in Texas? - ✔✔¼ inch per foot

✔✔¼ inch per foot equals approximately what percent? - ✔✔2%

✔✔What is the formula for pipe drop? - ✔✔Length (ft) × 0.25 = inches of drop

✔✔How much drop is required for 40 feet of pipe? - ✔✔10 inches

✔✔How much drop is required for 60 feet of pipe? - ✔✔15 inches

✔✔What happens if the slope is too steep? - ✔✔Solids carry over

✔✔What happens if the slope is too flat? - ✔✔Solids settle and clog

✔✔What is prohibited over a drainfield? - ✔✔Driving heavy equipment

✔✔When is an inspection required? - ✔✔Before covering the system

✔✔Who gives final system approval? - ✔✔Designated Representative or permitting
authority

✔✔Can Installer I change system design in the field? - ✔✔No

✔✔Can Installer I adjust pipe slope per design? - ✔✔Yes

✔✔Can local authorities be more restrictive than state rules? - ✔✔Yes

✔✔Can local authorities be less restrictive than state rules? - ✔✔No

✔✔What test measures soil absorption? - ✔✔Perc test

✔✔Does Installer I size drainfields? - ✔✔No

✔✔Who issues the Installer I license? - ✔✔TCEQ

✔✔How many feet is 24 inches? - ✔✔2 feet
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