What Does CIES Mean?

The Short Answer: What CIES Stands For Here

On this site, CIES means Council-certified Indoor Environmental Supervisor. It is a professional certification for people who plan, direct and oversee remediation work in the indoor environment: removing or controlling asbestos, lead, other hazardous materials, microbial contaminants and allergens, and chemicals in buildings. The word "supervisor" is the key: the credential is aimed at someone responsible for how remediation is executed, not simply someone who has read about it.

If you landed here from a search for the acronym alone, read the next section before going further. If you already know you want this specific credential, jump ahead to the five competency areas, then continue to the full CIES requirements guide for eligibility detail.

Why the Acronym Causes Confusion

"CIES" is a short string of letters, and more than one professional credential in unrelated fields has used it. A search for the acronym can therefore return material about completely different certifications, with different certifying bodies, different exams and different career paths. None of that material applies to the credential discussed here.

To avoid mixing sources, anchor on the full name: Council-certified Indoor Environmental Supervisor. When you evaluate any study resource, practice test or salary claim, check that it names this exact credential and the American Council for Accredited Certification (ACAC). If a page talks about a different industry, different fees or a different exam body, it is describing something else. Our companion articles on what CIES is and what CIES stands for cover the same ground from other angles.

Who Issues the Credential and What It Certifies

The credential is issued by the American Council for Accredited Certification (ACAC), operating through its CIES Certification Board. ACAC's program is accredited by the Council for Engineering and Scientific Specialty Boards (CESB), an organization that accredits specialty certification programs in engineering and scientific fields. Exam delivery is handled by Kryterion, Inc.

What the certification signals is a combination of documented field experience and a passed examination. ACAC does not hand the credential to anyone who simply sits an exam. Applicants submit project sheets and experience verification, and the certification board must approve the application. This is why the credential tends to carry weight with employers who need a supervisor they can point to as qualified on paper as well as on the job site. For a broader view of what the certificate represents, see our overview of CIES certification.

Reading the Title Word by Word

Council-certified

The certification comes from a council-style certifying body (ACAC) whose program is itself accredited by CESB. The "Council" in the title refers to that certifying structure.

Indoor Environmental

The scope is the built indoor environment: occupied and unoccupied buildings where contaminants must be identified, contained, removed or controlled. It is not an outdoor-site or general environmental-science credential.

Supervisor

The holder is expected to direct remediation work. Each of the five published competency headings uses the phrase "understand and execute successful remediation," and each addresses engineering controls, cleaning and removal methods, worker safety and applicable regulations. That combination describes a person who both knows the rules and runs the job.

The Five Competency Areas Behind the Title

ACAC publishes five competency headings for CIES. They are unweighted: no public chart assigns percentages to them, and the handbook notes that the board prescribes an exam blueprint without reproducing it publicly. Treat them as preparation topics rather than a guarantee of exact exam coverage. Our complete guide to all five CIES content areas goes deeper on each.

How the Exam Works

The CIES examination is a 120-question multiple-choice test, each question with at least four answer options. It is computer-delivered, closed book, and runs three hours. The passing score is 75%, set using the Modified Angoff method, a standard-setting approach in which subject-matter experts judge how a minimally competent candidate would perform on each item. ACAC does not publish how many questions are scored versus unscored, and no separate practical assessment is described.

According to the candidate handbook, the test uses a fixed question set with randomized item and answer order. Adaptive testing is not described, and calculator permission is unverified, so confirm that detail with ACAC before exam day. Scores are available electronically right after the exam and confirmed by email.

For online delivery, ACAC specifies a computer with an approved webcam, a private location and at least 2 Mbps upload and download speed; phones and tablets are excluded. At a testing center, two government-issued IDs are required, one of them a photo ID. Arrival guidance differs between sources: the current Examinations page says 15 minutes early, while the handbook says 30, so plan for the longer window. More on the cut score is in our CIES passing score guide, and scheduling notes are in the exam dates article.

What It Takes to Qualify

The exam is only one part of the credential. ACAC requires a combination of education and documented indoor environmental remediation experience. Three pathways are published:

1. A related four-year postsecondary degree, or 30 qualifying college credits, plus four years of documented indoor environmental remediation experience.
2. A related two-year degree, or 15 qualifying credits, plus six years of experience.
3. A high school diploma or GED plus eight years of experience.

Regardless of pathway, the experience must cover at least three of five areas: asbestos; lead; hazardous materials; microbial/allergens; and industrial hygiene/chemicals/toxicology. Applicants also submit four project sheets, educational evidence where applicable, and experience verification. ACAC's FAQ describes each project sheet as covering the problem, the applicant's own responsibilities and actions, and the outcome, and it requires actual field experience. Writing about what you personally did, rather than what your crew or company did, is the heart of a strong sheet.

Application handling has an unresolved inconsistency worth knowing about. The current online application page specifies online submission, required email verifications, a six-month window that includes the examination, and unanimous board approval, with the board meeting every four to six weeks. The candidate handbook instead gives 90 days and describes notarized forms and employer affidavits. Until ACAC reconciles these, follow the most current page and confirm directly. Full details live in our CIES requirements guide.

Fees, Term Length and Renewal

Costs are published in US dollars. The initial package is an examination fee of $100 plus a certification fee of $400 (which includes a $100 nonrefundable processing fee), totaling $500 for the initial two-year term. A retake costs $100 and renewal is $400. No separate member and non-member schedule is published. See the CIES certification cost breakdown for planning detail.

The certification is valid for two years. Current recertification procedures call for 40 recertification credits: 10 for continued field activity and 30 for professional development during the term, with an attestation and evidence retained in case of audit. A current photo is requested. Other ACAC documents describe the requirement slightly differently (the handbook gives a general 40 credits, and a program page mentions 20 professional-development hours annually), so check the procedures page before logging your credits.

Certification Versus State Licensing

This distinction trips up many candidates. Some states use ACAC examinations as part of their own licensing processes. Florida is the example that comes up most: indexed content from the state's Department of Business and Professional Regulation lists CIES among mold-remediation examinations, though the regulator's page could not be directly retrieved for verification at the time of writing. The regulator's checklist for the initial mold remediator license makes clear that passing an approved exam is only one part of licensing; separate application, education and experience, fingerprinting and insurance requirements also apply.

Who Uses the Credential

Because the title is supervisor-level and the scope spans several hazard types, the credential fits people who run or oversee remediation: project managers and field supervisors at abatement and remediation contractors, environmental consulting and industrial hygiene firms, facility and property management groups that handle contaminated buildings, and public-sector or institutional environmental health staff. Mold remediators in states that recognize the exam may also encounter it through licensing.

On earnings, be cautious. No reliable salary survey specific to ACAC CIES holders was verified, and no causal pay premium for the credential has been established. Pay for supervisors in this field depends heavily on region, employer type and hazard specialty. Our salary analysis, ROI discussion and jobs overview treat the topic qualitatively for that reason.

Matching Your Study Order to the Competencies

Because the five areas are unweighted publicly, build your plan around your own gaps rather than a guessed blueprint. A practical approach: spend the most time on the disciplines where your field experience is thinnest, since you will have documented only three of the five for eligibility. The sequence below is one reasonable layout, not an official schedule.

ACAC's public study guide warns that its selected pages are examples, not exhaustive coverage, and recommends comprehensive study of the listed references. No mandatory preparation course or minimum training-hour requirement is published, and ACAC does not develop or administer prep courses. For a structured plan, see the CIES study guide, the one-page cheat sheet for last-minute review, and our difficulty guide. When you are ready to test yourself under timed conditions, try the CIES practice tests and work through the scenario-style questions on the main practice site.

Frequently Asked Questions