EPA Underground Storage Tank Operator

First published: September 1, 2026Last verified: September 2, 2026Reviewed by the CertQuestUSA team

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 citing the real regulation it comes from.

Where these questions come from

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

Not sure where you stand? Take the free diagnostic — 10 real questions across the exam's domains, no sign-up required, with a domain-by-domain breakdown at the end.

Start diagnostic

2

full papers, no repeats

50

questions per paper

118

questions in the bank

What this exam covers

Applicability & Exclusions (280.10, 280.12)10%
Out-of-Service & Closure (280.70-.74)9%
Financial Responsibility (280.90-.93)6%
General Operating Requirements (280.30-.36)17%
Operator Classes A/B/C & Training (Subpart J, 280.240-.245)16%
New & Upgraded UST Performance Standards (280.20-.21)11%
Release Detection (280.40-.45)18%
Release Response & Corrective Action (280.50-.66)13%

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

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

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

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

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

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

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 diagnostic for EPA Underground Storage Tank Operator?

Yes -- 10 real questions across the exam's domains, no sign-up required, with a domain-by-domain breakdown at the end.