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EPA 608 Practice Test 2026: Free Core Questions

Last checked October 20, 2026

Ten Core questions, right here. No account, no email.

Pick an answer and you'll see right away whether it's correct, why, and the rule it comes from.

Question 1 of 10

Which element released from CFC molecules in the stratosphere is mainly responsible for destroying ozone?

Question 2 of 10

Why can a small amount of chlorine cause large ozone losses?

Question 3 of 10

Which is a recognized health effect of increased UV-B radiation reaching the ground because of ozone depletion?

Question 4 of 10

Ozone depletion potential (ODP) values are measured relative to which refrigerant, which is assigned an ODP of 1.0?

Question 5 of 10

HFCs do not deplete ozone, but many are still regulated because they:

Question 6 of 10

Compared with CFCs, HCFCs cause less ozone depletion mainly because the hydrogen in them:

Question 7 of 10

R-22 is classified as a:

Question 8 of 10

Which refrigerant is an HFO (hydrofluoroolefin) with a very low global warming potential?

Question 9 of 10

The Montreal Protocol is best described as:

Question 10 of 10

EPA's refrigerant management program for stationary refrigeration and air conditioning is established under which section of the Clean Air Act?

How the real exam works

The EPA 608 exam has four sections: Core, Type I, Type II and Type III. Each test pulls 25 questions per section from EPA's question bank (40 CFR Part 82, Appendix D to Subpart F).

The pass mark is 70%. On a 25-question section, that means 18 correct answers.

Everyone takes Core. You then add the type that matches the equipment you work on, or take all three for Universal.

Why practice on 2026 rules

The rules have moved in the last few years. Some free tests still teach old numbers.

Two examples:

  • Evacuation levels. The current table groups appliances by pressure class. Older guides still show a separate HCFC-22 row (40 CFR 82.156).
  • Leak repair. Section 608 leak repair now covers ozone-depleting refrigerants in appliances with 50 lb or more. HFC leak repair falls under the AIM Act (40 CFR 82.157, 40 CFR 84.106). This is a separate rule from Section 608 (40 CFR 84.106). You need it on the job, but testing programs may not test it yet.

Every question here cites the rule it tests and shows the date it was last checked.

What you get for free

  • The full Core practice test, with every answer explained
  • A strategy tip on each question
  • Progress saved on your device

Type I, II and III practice and a 100-question Universal mock exam come with the $19 one-time Universal pass.

Keep going

You've seen ten questions. The full Core test is the best next step, because no certification is issued unless you pass Core.

Take the free Core test

80 free questions. No signup.

Good to know

This is practice, not the certification. To get certified, you pass a proctored exam from an EPA-approved certifying organization (EPA certification requirements).

Sources