CHMM Exam Pass Rate, Format & Study Guide

The IHMM exam specifications (effective 2021) and the January 2026 candidate handbook describe a closed-book, computer-based multiple-choice exam of four options with one correct answer. The passing score is 700 on a 0-1000 scaled score, set by criterion-referenced scoring. The twelve domains range from Health and Safety (10.57%) and Shipping and Transporting Hazardous Waste and Hazardous Materials (10.34%) to Remediation (6.5%). Unscored pre-test items may appear in some exam forms; IHMM does not publish how many.

The CHMM is the IHMM credential for professionals who manage hazardous materials and waste across industries.

Environmental, health and safety professionals and hazmat managers who are preparing for the CHMM.

The certifying body does not publicly publish an official pass rate for this exam. Be wary of third-party sites citing a specific number here — treat any pass-rate claim you see elsewhere for this exam as unverified.

Retake rules and waiting periods are set by IHMM; check the current candidate handbook before you reschedule.

The passing score is 700 on a 0-1000 scaled score; a scaled score is not a percentage of correct answers, so the percent score in the portal mock is only a self-check. Format: 140 multiple-choice questions in 3 hours on computer, closed book; the portal mock uses 140 questions in 180 minutes. No official pass rate is available for this exam, so none is quoted here.

The IHMM exam specifications (effective 2021) and the January 2026 candidate handbook describe a closed-book, computer-based multiple-choice exam of four options with one correct answer. The passing score is 700 on a 0-1000 scaled score, set by criterion-referenced scoring. The twelve domains range from Health and Safety (10.57%) and Shipping and Transporting Hazardous Waste and Hazardous Materials (10.34%) to Remediation (6.5%). Unscored pre-test items may appear in some exam forms; IHMM does not publish how many. 140 multiple-choice questions · 3 hours · computer-based, closed book · scaled score of 700 on 0-1000 to pass. The passing score is 700 on a 0-1000 scaled score; a scaled score is not a percentage of correct answers, so the percent score in the portal mock is only a self-check.

• Planning for Materials with Hazards9.3%
• Shipping and Transporting Hazardous Waste and Hazardous Materials10.3%
• Store Materials with Hazard9.2%
• Facility Operations Involving Materials with Hazards9.1%
• Disposition of Materials with Hazards8.5%
• Record Keeping and Reporting7.5%
• Training Personnel8.1%
• Response and Recovery8%
• Remediation6.5%
• Management Systems6.6%
• Environmental Studies6.3%
• Health and Safety10.6%

The content outline spreads questions across 12 areas: Planning for Materials with Hazards (9.3%); Shipping and Transporting Hazardous Waste and Hazardous Materials (10.3%); Store Materials with Hazard (9.2%); Facility Operations Involving Materials with Hazards (9.1%); Disposition of Materials with Hazards (8.5%); Record Keeping and Reporting (7.5%); Training Personnel (8.1%); Response and Recovery (8.0%); Remediation (6.5%); Management Systems (6.6%); Environmental Studies (6.3%); Health and Safety (10.6%).

IHMM publishes the education and experience requirements for the CHMM in its candidate handbook and reviews your application before you can schedule. Read the current requirements before you apply.

IHMM charges application and exam fees and may charge for rescheduling. The amounts change, so no figure is quoted here; confirm them in the IHMM candidate handbook.

Holding the CHMM involves IHMM recertification requirements; check the current handbook for the rules.

Work through all twelve domains, spending extra time on Health and Safety and shipping rules, and finish with timed 140-question runs.

This guide follows the IHMM CHMM exam specifications (effective 2021) and the IHMM candidate handbook of January 2026, checked October 31, 2026. Fees and policies can change.