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United States · Certification test

EPA 608 certification lookup

The Environmental Protection Agency (EPA) doesn’t keep a database of certified technicians, so there’s no single EPA 608 certification lookup. Each certifying organization keeps its own records, and since January 1, 2018 every program that isn’t run by the federal government has had to publish online a list of the technicians it certified. To check someone, start with the program named on their card.

  • NoneNational database kept by EPA
  • Once a yearLeast often a program must update its list
  • January 1, 2017Certifications the online lists cover from
Where to study

Updated October 2026 · Written from official sources, listed at the bottom of this page

What each program’s online list shows

  • The technician’s first name, middle initial and last name
  • The city they lived in when they took the test
  • The type or types of certification
  • The date of each certification

Programs must tell technicians their details will be published, and must let them opt out. So a name missing from a list doesn’t prove someone isn’t certified, and certifications from before 2017 don’t have to be listed.

How do you do an EPA 608 certification lookup?

  • Mainstream Engineering’s Certification Credentials Lookup: search by name, with city, state and ZIP code, or by certification number. It shows the valid certificates Mainstream issued to that person.
  • The Air Conditioning Contractors of America (ACCA) posts a searchable list of the technicians it has certified.
  • ESCO Institute, as an approved program that isn’t federal, has to publish a list too. EPA links to ESCO’s site from its program list.
ESCO, Mainstream and other approved programs →

Finding your own EPA certification number

Your number is printed on your card. If the card is lost, ask the program that tested you: approved programs must keep the names, addresses, scores and test dates of everyone they test, with no time limit. If you’ve forgotten which program it was, the card page lists where to look.

EPA certification card replacement →

How to verify EPA certification before you hire

Ask to see the card or a copy. Technicians have to keep a copy of their certificate at their place of business, and EPA says customers may ask for proof. Then check the name on the issuing program’s list or lookup tool, keeping in mind the opt-out and the 2017 start date.

Refrigerant sellers do a version of this check every time: they must confirm the buyer is a certified technician or employs one, and they accept a copy of the card, the program’s certificate, or proof that the buyer employs a certified technician.

Section 609 lookups

Motor vehicle air-conditioning certifications under Section 609 are kept by the program that issued them, and some closed programs’ records have moved. The details are on the Section 609 page.

EPA 609 certification online →
Sources: EPA · eCFR · Mainstream Engineering and 3 more. Checked October 2026.

Rules and fees can change, so check the official site before your test.

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Certification types

Type IType IIType IIIUniversalSection 609

Programs and states

ESCO and othersBy state