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Free UST Operator Practice Test Online

Official exam: EPA Underground Storage Tank Operator

Take a free UST Operator practice test online: a full 50-question paper with every answer explained, no sign-up, scored by topic. The full 118-question bank and the timed simulator are $14.99 for 30 days.

First published: September 1, 2026Bank updated: September 2, 2026Published by CertQuestUSA · review process
TL;DR

EPA Underground Storage Tank Operator: a 118-question practice bank for the real EPA Environmental standard, 2 full papers of 50 questions each with no repeats, every question written to the regulation it comes from.

Where these questions come from

Every question in this bank cites a source -- primarily 40 CFR (100%) of this exam's citations.

Take a full practice test free. 50 real questions built to the exam's domain weights, every answer explained, no sign-up required, with a domain-by-domain score at the end.
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2
full papers, no repeats
50
questions per paper
118
questions in the bank
What this exam covers
5 real sample questions
Under 40 CFR 280.93, an owner/operator with 101 or more petroleum USTs must maintain an annual aggregate financial responsibility amount of at least:
A. $1 million
B. $2 million
C. $3 million
D. $5 million
Show answer and reasoning

Correct answer: B. $2 million

  • A: $1 million is the annual aggregate for the smaller 1-100 tank tier, not this one.
  • C: $3 million overstates the annual aggregate requirement for this tier.
  • D: $5 million overstates the annual aggregate requirement for this tier.
Source: 40 CFR 280.93
Under 40 CFR 280.41(a), tanks installed after April 11, 2016 must use release detection that complies with:
A. 280.43(g), monitored monthly
B. 280.20(c) only
C. No release detection is required for new tanks
D. Annual tightness testing only
Show answer and reasoning

Correct answer: A. 280.43(g), monitored monthly

  • B: 280.20(c) addresses spill/overfill prevention equipment, not release detection method standards.
  • C: New tanks are not exempt from release detection.
  • D: Annual tightness testing alone does not satisfy the monthly monitoring standard required for post-2016 tanks.
Source: 40 CFR 280.41(a)
Under 40 CFR 280.93, petroleum marketing facilities or those handling more than 10,000 gallons of petroleum per month must maintain per-occurrence financial responsibility coverage of at least:
A. $500,000
B. $1 million
C. $2 million
D. $5 million
Show answer and reasoning

Correct answer: B. $1 million

  • A: $500,000 is the per-occurrence amount for lower-throughput, non-marketing facilities, not this higher-throughput tier.
  • C: $2 million is the annual aggregate figure for large operations, not the per-occurrence amount here.
  • D: $5 million overstates the per-occurrence requirement.
Source: 40 CFR 280.93
Under 40 CFR 280.93, petroleum UST owners/operators that do not meet the high-throughput/marketing threshold must maintain per-occurrence coverage of at least:
A. $250,000
B. $500,000
C. $1 million
D. $2 million
Show answer and reasoning

Correct answer: B. $500,000

  • A: $250,000 understates the required per-occurrence amount.
  • C: $1 million is the per-occurrence amount for the higher-throughput/marketing tier, not this one.
  • D: $2 million is an annual aggregate figure, not this per-occurrence amount.
Source: 40 CFR 280.93
Under 40 CFR 280.33, a metal pipe section or fitting that has released product due to corrosion or other damage must be:
A. Patched with epoxy and returned to service
B. Replaced
C. Wrapped in tape and monitored monthly
D. Left in place if the leak rate is below 0.1 gph
Show answer and reasoning

Correct answer: B. Replaced

  • A: Epoxy patching is not an accepted remedy for a corroded metal pipe that has released product.
  • C: Tape wrapping is not an accepted remedy for a corroded metal pipe that has released product.
  • D: The rule requires replacement outright; a low measured leak rate does not create an exception.
Source: 40 CFR 280.33
Real-world data for this exam
Environmental Scientists and Specialists, Including Health: real median wageMay 2025$82,220/yr

Frequently asked questions

Where can I take a free UST Operator practice test online?
Right here. CertQuestUSA's free UST Operator practice test online is a full 50-question practice paper built to the real exam's domain weights, with every answer explained, with no sign-up and no credit card, and shows your score by topic at the end. The full 118-question bank, with every answer explained and cited to the regulation it comes from, is $14.99 for a 30-day pass that never renews.
How many questions are on the CertQuestUSA EPA Underground Storage Tank Operator practice test?
118 questions total, split into 2 full papers of 50 each with no repeats across papers.
What topics does the EPA Underground Storage Tank Operator test cover?
8 domains, with the heaviest weight on Release Detection (280.40-.45) (18%), General Operating Requirements (280.30-.36) (17%), and Operator Classes A/B/C & Training (Subpart J, 280.240-.245) (16%).
Where do CertQuestUSA's EPA Underground Storage Tank Operator questions come from?
Primarily 40 CFR (100%) of this bank's citations -- computed directly from this exam's own question sources, not a generic description.
Is there a free EPA Underground Storage Tank Operator practice test?
Yes -- one full 50-question practice paper built to the exam's domain weights, free with no sign-up, with every answer explained and a domain-by-domain score at the end.
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