CIES Requirements 2026: Eligibility, Prerequisites & How to Qualify

What This Credential Actually Is

Before checking eligibility, make sure you are pursuing the right credential. In this article, CIES means the Council-certified Indoor Environmental Supervisor credential issued by the American Council for Accredited Certification (ACAC) through its CIES Certification Board. The program is accredited by the Council for Engineering and Scientific Specialty Boards (CESB). If you are new to the acronym, our explainers on what CIES certification is and what CIES stands for cover the basics.

The word that defines this credential is supervisor. Unlike entry-level awareness training, CIES is built around people who have actually run indoor environmental remediation work in the field. That is why the eligibility rules lean so heavily on documented experience, and why the application asks you to describe real projects in your own words. A written exam alone will not get you certified; the board has to approve your background first.

The Three Eligibility Pathways

ACAC publishes three routes to qualify. Each trades formal education against years of documented indoor environmental remediation experience. The more education you can show, the fewer years of field time you need.

A few practical notes on reading this table:

• Credits can substitute for a completed degree. If you have not finished a degree but have accumulated 30 qualifying credits (Pathway A) or 15 (Pathway B), you can still use that route.
• "Qualifying" matters. ACAC's Frequently Asked Questions page explains which semester-credit subjects count. Do not assume every transcript line qualifies; check the FAQ before deciding which pathway to claim.
• Experience must be actual field work. ACAC requires real field experience in indoor environmental remediation, not classroom hours or purely administrative exposure.
• No mandatory course. No required preparation course or minimum training-hour count is published, and ACAC does not develop or administer preparation courses.

The Five Experience Areas and the Three-of-Five Rule

Years on the job are not enough by themselves. Your experience must cover at least three of these five areas:

1. Asbestos
2. Lead
3. Hazardous Materials
4. Microbial/Allergens
5. IH/Chemicals/Toxicology

These areas line up with the five competency headings ACAC publishes in its candidate handbook, which we treat as preparation topics:

Note the distinction: the eligibility rule asks for experience in three of five areas, but the exam preparation topics span all five. That gap is the central planning problem for most applicants. A mold remediation veteran, for example, may qualify on experience in microbial/allergens, hazardous materials and lead, yet still need serious study time on asbestos regulations and chemical hazards. Our complete guide to the five CIES content areas breaks down each one in more depth.

Writing the Four Project Sheets

The application requires four project sheets, along with educational evidence where applicable and experience verification. According to ACAC's FAQ, each sheet describes three things:

• The problem: what contamination or hazard condition existed.
• Your own responsibilities and actions: what you did, not what your company or crew did collectively.
• The outcome: how the project concluded.

Because the board must be satisfied that you have supervisory-level command of the subject, the "your own actions" element is where weak applications stumble. Vague phrases like "the team performed containment" tell reviewers nothing. Better sheets name the engineering controls you specified, the cleaning or removal methods you selected, the worker-safety measures you enforced and the regulations that governed the job. Those are the same themes that run through every published CIES competency: engineering controls, cleaning/removal methods, worker safety and applicable regulations.

Application Mechanics and Board Review

ACAC's current Applications and Project Sheets page for Indoor Environmental Remediation describes online submission, required email verifications and a review that ends in a unanimous board approval. The page also states that the board meets every four to six weeks, so your approval timing depends on where your submission lands in that cycle.

Where ACAC's own sources disagree

Candidates should know that ACAC's published materials are not fully consistent, and we do not want to paper over that:

• Completion window: the current application page specifies six months including the examination, while the CIES handbook gives 90 days.
• Verification format: the handbook describes notarized forms and employer affidavits, whereas the current online process emphasizes email verifications.

This conflict is unresolved in the public record. The sensible approach is to treat the stricter figure (90 days) as your planning target, and to confirm the current rule directly with ACAC before you begin. Our guide to CIES exam dates, deadlines and scheduling tracks how timing fits together.

Exam Format and Test-Day Requirements

Once the board approves your application, you sit a proctored exam delivered through Kryterion, Inc. Here is what is published:

• 120 multiple-choice questions, each with at least four answer options.
• Three hours, computer-delivered, closed book.
• 75% passing score, set using the Modified Angoff method. See what the CIES passing score means in practice.
• The split between scored and unscored questions is not published.
• No separate practical assessment is described.
• The handbook describes a fixed question set with randomized item and answer order; adaptive testing is not described.
• Scores are available electronically immediately and confirmed by email.

Delivery options and ID rules

Both proctored testing-center and online video delivery are available.

• At a testing center: bring two government-issued IDs, including one photo ID. ACAC's current Examinations page gives a 15-minute early arrival, while the handbook says 30 minutes. Arrive at the earlier handbook figure to be safe.
• Online: you supply a computer, an approved webcam and a private location. ACAC specifies at least 2 Mbps upload and download speeds, and phones and tablets are excluded.

Whether a calculator is permitted is unverified in the sources we reviewed, so confirm before test day rather than assuming. For a sense of how demanding the content is, see how hard the CIES exam really is.

Fees at a Glance

All amounts are in USD, from ACAC's Fees and Payments page. No separate member and non-member schedule is published.

Because $100 of the certification fee is a nonrefundable processing fee, make sure your eligibility is solid before you submit. For the full picture, including budgeting beyond ACAC's fees, read our CIES certification cost breakdown.

State Licensing vs. ACAC Certification

This distinction trips up a lot of candidates. Florida's Department of Business and Professional Regulation has listed CIES among the examinations relevant to mold-remediation licensing, according to indexed content we reviewed. However, we could not directly retrieve the regulator's page (it returned an access error), so treat that as a lead to verify, not a confirmed current rule.

What we can say with confidence is this: the regulator's accessible checklist for the Mold Remediator initial license by examination confirms that passing an approved examination is only one part of licensing. Separate application, education and experience, fingerprinting and insurance requirements also apply.

Matching Your Preparation to Your Experience Gaps

Your eligibility pathway quietly predicts where you will need to study hardest. Because only three of the five areas must appear in your experience, you will almost certainly walk into the exam with at least one or two domains that are new to you.

• If your background is mold and microbial work: prioritize Domains 1, 2 and 5. Asbestos, lead and chemical remediation involve regulatory frameworks that differ sharply from mold protocols.
• If you come from asbestos or lead abatement: spend extra time on Domain 4 (microbial contaminants and allergens) and Domain 5 (chemicals), where abatement training rarely goes deep.
• If you work in industrial hygiene or chemical response: Domains 1 and 2 will likely need the most attention, since asbestos and lead rules are heavily regulation-driven.

ACAC lists preparation references including 40 CFR 763, 40 CFR 61 Subpart M, 29 CFR 1926.1101 (asbestos), 40 CFR 745 (lead-based paint), 29 CFR 1926.62 (lead in construction), 29 CFR 1910.120 (hazardous waste operations), the New York City Department of Health guidelines on fungi in indoor environments, NIOSH Respirator Selection Logic and the EPA voluntary guidelines for methamphetamine lab cleanup. ACAC warns that its public study-guide pages are examples rather than exhaustive coverage and advises studying the references comprehensively. One more caution: the handbook's body-of-knowledge and study-guide descriptions of mercury material cite different sources, so confirm which reference applies if mercury is a gap area for you.

Start with our CIES study guide for first-attempt success, keep the one-page CIES cheat sheet handy for quick review, and test yourself with realistic questions on the CIES practice test.

Keeping the Credential: Two-Year Renewal

Certification is valid for two years. ACAC's current Recertification Procedures specify 40 recertification credits per term: 10 for continued field activity and 30 for professional development. You attest to these credits and retain evidence in case of audit, and a current photo is requested. Renewal costs $400.

Be aware that ACAC's sources differ here too: the handbook gives a general 40-credit figure and the program page mentions 20 professional-development hours annually. The current Recertification Procedures page is the most specific, so use it as your working guide and verify with ACAC.

Whether the investment pays off depends on your market and employer. Our analyses of whether CIES is worth it and the CIES salary picture look at the return honestly, including the fact that no reliable salary survey specific to ACAC CIES holders has been verified. You can also explore CIES jobs to see where the credential is put to use.

Frequently Asked Questions