Does HAZWOPER actually expire?

OSHA’s HAZWOPER standard, 29 CFR 1910.120, does not set a single national expiration date for every HAZWOPER certificate. Instead, OSHA cares about two things:

• Whether workers and supervisors complete an initial course that matches their duties and exposure level, such as the 24 Hour HAZWOPER or 40 Hour HAZWOPER.
• Whether they stay current and competent through an 8 hour refresher every year, plus site specific and hands on training from the employer.

In practice, most employers treat HAZWOPER as current when the worker has completed an approved initial course and has completed a refresher within the last 12 months or close to that time frame, with any lapse explained in the record.

What OSHA 29 CFR 1910.120 says about refreshers

OSHA uses the refresher requirement to keep skills sharp. Under the standard, covered workers and supervisors:

• Complete an initial 24 or 40 hour HAZWOPER course (plus supervisor training if they are in charge of others).
• Complete an 8 hour HAZWOPER refresher every 12 months.
• Receive site specific, hands on, and emergency procedures training from their employer as conditions change.

The standard does not say that a certificate stops being valid at midnight on the anniversary date. It does expect employers to make a good faith effort to keep refreshers on schedule and to be able to explain what they did if someone falls behind.

What if my HAZWOPER is overdue?

OSHA guidance often uses phrases such as “as soon as possible” for workers who miss the annual refresher. That means if your refresher is late, you should complete it right away. Your employer should:

• Schedule and document the 8 hour refresher as soon as practical.
• Review your job duties and exposure level to see whether a simple refresher is still enough.
• Document how the gap was handled in case an OSHA inspector asks about it later.

For many workers who are only a little overdue, the employer is comfortable documenting the gap, sending them through an 8 hour refresher, and moving on.

If you are years out of date

When someone is several years out of date or has been working in a different field, employers often want a deeper reset than a single 8 hour refresher. Common approaches include:

• Extra refresher time. Completing the 8 hour refresher plus additional review hours or toolbox talks focused on the current job.
• One on one review. Time with a competent person to walk through PPE, equipment, procedures, and any changes in site conditions.
• Full 24 or 40 hour course again. For very old training or major duty changes, many employers decide that a complete initial course is the safest option.

The goal is not to punish the worker. The goal is to be confident that people who enter hazardous waste sites or respond to releases can actually do the job safely today, using current practices, PPE, and procedures.

State plan differences

States with OSHA approved plans usually follow the same basic HAZWOPER refresher pattern. Some state agencies publish additional guidance or best practices about how employers should handle overdue training.

If you work in a state plan state, check the links on our HAZWOPER Training by State page and look for state specific guidance on refresher expectations.

Which course should I take if I am out of date?

The right course depends on three main questions:

• Did you previously complete the correct initial course? General site workers usually need the 40 Hour HAZWOPER, while occasional site workers often use the 24 Hour HAZWOPER.
• How far out of date are you? A few months is different from ten years.
• What are your current duties and exposure level? Higher exposure and respirator use call for a more cautious approach.

Some common scenarios:

• Only slightly overdue. Many employers accept an 8 Hour HAZWOPER Refresher with documentation of the gap.
• Several years out of date but same duties. Employers may choose an 8 hour refresher plus extra review or send the worker back through the full 24 or 40 hour course.
• New job with higher exposure. If you previously took 24 hour but are moving into a general site worker role, your employer may require the full 40 Hour HAZWOPER, not just a refresher.

When in doubt, talk with your safety manager or supervisor. They are responsible for matching your training level to the hazards in your job.

Ready to get current on your HAZWOPER?

Enroll in an online HAZWOPER course, complete the knowledge portion at your own pace, and download your certificate as soon as you finish. Your employer can then complete the site specific and hands on pieces required by OSHA.

Enroll in 8 Hour Refresher Enroll in 24 Hour HAZWOPER Enroll in 40 Hour HAZWOPER

Quick FAQs

Here are fast answers to the questions students ask most often about HAZWOPER expiration and refreshers.

How often do I need HAZWOPER refresher training?

OSHA expects covered workers and supervisors to complete an 8 hour refresher every 12 months. If you miss the exact date, complete the refresher as soon as possible and make sure your employer documents the gap.

Does my certificate show an official expiration date?

Some training providers print a “good through” date on the certificate to make scheduling easier, but OSHA does not assign a federal expiration date. What matters is whether you have taken an appropriate initial course and are completing refreshers regularly.

Can I work if my HAZWOPER training is out of date?

Your employer is responsible for deciding whether it is acceptable for you to keep working while refresher training is pending. Many employers limit duties or access to higher hazard areas until the refresher is complete, especially if there has been a long gap.

Do supervisors have different refresher rules?

Supervisors complete the same annual refresher hours as workers, but they also complete an initial 8 Hour HAZWOPER Supervisor course and often a supervisor specific refresher such as the 8 Hour HAZWOPER Supervisor Refresher.

Related HAZWOPER guides

• What Is HAZWOPER Training?
• How to Get HAZWOPER Certified Online
• 40 Hour vs 24 Hour HAZWOPER: Which Do You Need?
• OSHA Requirements for HAZWOPER Certification
• HAZWOPER Near Me

Last updated: November 2025