- Identity Snapshot: Which CRER This Is
- Exam Format at a Glance
- Fees, Renewal and Recertification Math
- Eligibility and Application Quirks
- The Five Skill Groups: Cheat-Sheet Version
- Source-Reading Guide for the Reference List
- Known Source Conflicts to Remember
- Reading the Pass-Ratio Number Carefully
- Sequencing Your Review by Domain
- Quick-Answer FAQ
- CRER here means Council-certified Residential Environmental Remediator, issued by the American Council for Accredited Certification (ACAC), not any other...
- The exam is 50 multiple-choice questions, two hours, closed book, with a 70% passing criterion set by modified Angoff.
- Initial US/Canada cost is USD 400; retakes are USD 100; renewal is USD 300 plus 40 RCs every two years.
- ACAC publishes five skill groups (asbestos, lead, hazardous materials, microbial, chemicals) but no percentage weights.
Identity Snapshot: Which CRER This Is
Several unrelated credentials and industries use the letters "CRER." This page covers exactly one: the Council-certified Residential Environmental Remediator, administered by the American Council for Accredited Certification (ACAC). Certification decisions are made by ACAC's CRER Certification Board, and the exam is delivered through the testing provider Kryterion, Inc. If a fee, date, or pass rate you find online does not trace back to ACAC, it probably belongs to a different credential.
If you are still orienting yourself, the explainers on what CRER is and what CRER stands for give the longer background. This cheat sheet assumes you already know the credential and want the facts compressed.
Exam Format at a Glance
| Item | CRER Fact |
|---|---|
| Questions | 50 multiple-choice, at least four answer choices each |
| Time limit | Two hours |
| Book policy | Closed book |
| Passing criterion | 70%, set by the certification board using modified Angoff |
| Delivery | Testing center or online video-proctored; instructor-proctored vocational exams also available through ACAC arrangements |
| Results | Immediate; question and answer order randomized |
| Online setup | Your own computer, approved webcam, private location, continuous 2 Mbps upload/download connection |
A 70% criterion on 50 questions works out to 35 correct answers, though ACAC frames the standard as a percentage criterion rather than publishing a raw-score table, so confirm any scoring details with the issuer. Our page on the CRER passing score goes deeper on how the standard is set.
Fees, Renewal and Recertification Math
Keep three buckets separate: what the issuer charges, what you optionally spend on preparation, and what you owe to stay certified.
| Item | Amount / Requirement |
|---|---|
| Initial fee (US/Canada) | USD 400 = USD 100 examination + USD 300 vocational certification for the first two-year term |
| Outside US/Canada | Current official application quotes USD 425 |
| Retake | USD 100 |
| Validity | Two years |
| Renewal | USD 300 plus 40 RCs (recertification credits) |
| RC allocation | 10 for continued field activity; 30 professional-development hours |
| Documentation | Retain records in case of audit |
A prep course is optional, and any course purchase is separate from issuer charges. Course hours are not exam timing, so do not conflate a course's length with the two-hour test window. For the full breakdown, see the CRER certification cost guide, and for a value judgment, the ROI analysis.
Eligibility and Application Quirks
The CRER route is employment-based. The handbook requires current employment in indoor environmental remediation, while the current application affidavit instead names indoor environmental consulting and adds attestations about legal work status, regulatory compliance, and ethics. Treat this wording difference as a reason to read the live application carefully rather than rely on any summary, including this one.
- No degree prerequisite for CRER, and it does not impose the two-year route associated with the CIER credential.
- Project sheets: the current application page expressly exempts CRER, even though generic handbook process text mentions them.
- Process steps: application, electronic signature, required email verification, examination, and unanimous certification-board review.
- Ethics: ACAC ethics is a named reference, so read it as exam material, not just paperwork.
The Five Skill Groups: Cheat-Sheet Version
ACAC's handbook lists five "Required Skills" competencies, which this site uses as unweighted study headings. No percentage weights are published, and the five-item list is not an official separately numbered blueprint, so do not assume equal weighting or exhaustive coverage. For each group, think in four lenses: engineering controls, cleaning and removal, worker protection, and the applicable regulatory references. The complete domains guide expands each area.
Domain 1: Understand and execute successful remediation of asbestos in the indoor environment
Know how containment, negative pressure, and wet methods control fiber release, and how removal and cleaning are executed and verified.
- Regulatory anchors: 40 CFR 763, 40 CFR 61 Subpart M, and 29 CFR 1926.1101
- Worker protection: respirator selection, decontamination, and exposure-control logic
Domain 2: Understand and execute successful remediation of lead in the indoor environment
Focus on dust control, safe work practices, cleanup, and protecting occupants and workers during disturbance of lead-containing materials.
- Regulatory anchors: 40 CFR 745 and 29 CFR 1926.62
- Worker protection: exposure assessment, hygiene facilities, and respiratory protection
Domain 3: Understand and execute successful remediation of hazardous materials in the indoor environment
This is the broadest group: it spans mercury response and methamphetamine laboratory cleanup, with emergency-style site work governed by hazardous-waste-operations rules.
- Regulatory anchor: 29 CFR 1910.120
- References: mercury response guidance and EPA methamphetamine cleanup guidelines (see conflicts below)
Domain 4: Understand and execute successful remediation of microbial contaminants and allergens in the indoor environment
Think moisture source correction, containment, physical removal over biocide reliance, and protecting workers during fungal remediation.
- Reference: NYC fungi-remediation guidance (2008)
- Worker protection: respirator selection and containment practices
Domain 5: Understand and execute successful remediation of chemicals in the indoor environment
Cover chemical hazards, ventilation and other engineering controls, safe removal, and protective equipment choices.
- Worker protection tie-in: NIOSH Respirator Selection Logic (2004)
- Hazard-communication and hazardous-operations rules overlap with Domain 3
Source-Reading Guide for the Reference List
The handbook warns that its selected study pages are examples and assumes comprehensive knowledge of its references. Skimming only the cited pages is a trap. Read each source with a specific question in mind:
- Asbestos (40 CFR 763, 40 CFR 61 Subpart M, 29 CFR 1926.1101): Separate what each rule governs: school and building-related requirements, demolition/renovation notification and work practices, and construction-worker protections. Ask which rule a scenario triggers.
- Lead (40 CFR 745, 29 CFR 1926.62): Distinguish residential and child-occupied-facility requirements from the construction worker-exposure standard.
- Hazardous materials (29 CFR 1910.120): Focus on how site work is organized around hazard assessment, training, and protective measures.
- Microbial contaminants and allergens (NYC fungi guidance, 2008): Study containment tiers, source control, and worker protection logic rather than memorizing sentences.
- Chemicals and methamphetamine cleanup: Read the EPA methamphetamine laboratory cleanup guidelines for site assessment, decontamination approach, and cleanup verification concepts.
- NIOSH Respirator Selection Logic (2004): Practice walking the decision logic from hazard identification to respirator type, since respiratory protection threads through every domain.
- Mercury guidance: Read the specific sections ACAC assigns, noting the title conflict described next.
Known Source Conflicts to Remember
- Methamphetamine guidance: ACAC names the Voluntary Guidelines for Methamphetamine Laboratory Cleanup without an edition. EPA's current PDF is titled "Voluntary Guidelines for Methamphetamine and Fentanyl Laboratory Cleanup" (revised August 2021). The expanded title does not mean ACAC adopted that edition or added fentanyl to CRER exam scope.
- NYC fungi guidance link: the legacy URL could not be retrieved, though the assignment and title are verified in the issuer handbook.
- Third-party career profiles: O*NET and My Next Move classify CRER as advanced and add education and experience requirements that conflict with the issuer's employment-attestation route. Treat the issuer as the authority on eligibility.
Reading the Pass-Ratio Number Carefully
ACAC's 2025 exam pass ratio for CRER is 0%, based on 0 passes out of 2 examinations. That denominator is far too small to establish typical difficulty, and the report includes retakes and state-licensing-only examinations. It would be a mistake to read it as "nobody passes." Our pass-rate data page and the difficulty guide put this in context.
Key Takeaway
Do not let a two-exam cohort drive your confidence up or down. Judge readiness by your own practice performance against the 70% criterion, using explained questions across all five skill groups.
Sequencing Your Review by Domain
Because no weights are published, spread effort sensibly and weight toward your own gaps. One CRER-specific sequence: start with the regulation-heavy groups so the CFR citations have time to settle, and place the broad hazardous-materials group where you have the most room for reading.
Asbestos and lead
- Map 40 CFR 763, 61 Subpart M, 1926.1101, 745, and 1926.62 to what each governs
Hazardous materials
- Read 29 CFR 1910.120, both mercury titles, and the methamphetamine cleanup guidelines
Microbial and chemicals
- Study the NYC fungi guidance and NIOSH Respirator Selection Logic decision flow
Ethics and mixed practice
- Review ACAC ethics, then drill mixed questions under a two-hour, closed-book limit
For a fuller plan, see the CRER study guide, then test yourself with the practice questions on the main site. If you want the one-page version of everything above bookmarked, it lives at the CRER cheat sheet, and the practice test hub is the best place to check retention afterward.
Quick-Answer FAQ
The CRER handbook specifies 50 multiple-choice questions with at least four answer choices each, in two hours, closed book. The 75-120 range on ACAC's generic examinations page does not apply to CRER.
The initial US/Canada fee is USD 400 (USD 100 exam plus USD 300 vocational certification for the first two-year term). The current application quotes USD 425 outside the US/Canada. A retake is USD 100. Optional prep purchases are extra.
CRER has no degree prerequisite, and the current application page expressly exempts CRER from project sheets. Eligibility rests on employment in indoor environmental remediation per the handbook, with the current form's affidavit naming indoor environmental consulting. Verify against the live application.
Certification lasts two years. Renewal costs USD 300 and 40 RCs, with current procedures allocating 10 for continued field activity and requiring 30 professional-development hours. Keep documentation in case of audit.
Yes. Delivery is by testing center or online video proctoring, and instructor-proctored vocational exams are available through ACAC arrangements. Online candidates need a computer, approved webcam, private location, and a continuous 2 Mbps upload/download connection.