What Does CIES Stand For?

The Short Answer

CIES stands for Council-certified Indoor Environmental Supervisor. It is a professional credential for people who plan, direct and verify the remediation of contaminants inside buildings. The word "Council-certified" points to the certifying organization, the American Council for Accredited Certification, and "Supervisor" signals that the credential targets people who oversee remediation work rather than only perform it.

If you landed here from a search for "what does CIES stand for," that is the whole answer in one line. The rest of this article explains what each word implies, who is behind the credential, what a candidate has to know, and how to avoid the most common mix-up associated with the acronym.

Why the Acronym Causes Confusion

Acronyms in the certification world are not unique. Several unrelated credentials in other industries abbreviate to the same four letters, and search engines often blend them together. A reader looking for information on one of those can end up with fee schedules, exam dates or salary claims that belong to a completely different certification.

This site covers exactly one meaning: the Council-certified Indoor Environmental Supervisor credential administered through ACAC. Every fact in this article, including the exam length, passing score, fees and eligibility rules, applies only to that credential. If you are researching anything else abbreviated as CIES, the figures below do not transfer.

For other short explainers on the same term, see our pages on what CIES is, the CIES meaning and what CIES means in practice. Each approaches the acronym from a slightly different angle.

Who Issues the Credential

The credential is issued by the American Council for Accredited Certification (ACAC) through its CIES Certification Board. ACAC's program is accredited by the Council for Engineering and Scientific Specialty Boards (CESB), which is the accreditation layer that gives the certification its professional standing. The examination itself is delivered through Kryterion, Inc., which handles the testing platform.

That three-part structure is worth remembering because it explains where to look for authoritative answers:

• ACAC decides eligibility, reviews applications and issues the certification.
• CESB accredits the program, not individual candidates.
• Kryterion delivers the exam, either at a proctored testing center or through online video proctoring.

For a broader overview of how the certification fits together, our page on what CIES certification is walks through the process from application to credential.

Reading the Title Word by Word

Council-certified

The certification is granted by a council, ACAC, after a board review. Approval of an application requires a unanimous board decision, and the board meets every four to six weeks according to the current application page. This is not a self-declared title; it is earned through documented experience, a project review and a passed examination.

Indoor Environmental

The scope is the built indoor environment. The competencies cover contaminants that affect occupants and workers inside structures: asbestos, lead, other hazardous materials, microbial growth and allergens, and chemical contamination. This breadth is what separates the credential from narrower, single-hazard certifications.

Supervisor

The supervisory role is the point of the credential. Each published competency addresses engineering controls, cleaning and removal methods, worker safety and applicable regulations, which is the skill set required to direct a remediation project and defend its decisions. A supervisor must understand not just how work is done but why a given control or method is appropriate and what regulation governs it.

The Five Competency Areas Behind the Name

ACAC publishes five competency headings for this credential. They are unweighted preparation topics, and no public chart gives official exam-domain weights, so be skeptical of any source that claims exact percentages. Each heading begins with the phrase "understand and execute successful remediation," which tells you the exam leans toward applied judgment rather than pure recall. A fuller breakdown lives in our complete guide to all five CIES content areas.

The public study guide itself warns that its selected pages are examples, not exhaustive coverage, and advises comprehensive study of the underlying references. Our CIES study guide turns that advice into a practical plan, and the CIES cheat sheet condenses the must-know facts onto one page.

What the Exam Looks Like

The format details below come from ACAC's published information:

No separate practical assessment is described. The split between scored and unscored questions is not published, and calculator permission is unverified, so check your confirmation materials before test day. For online testing, ACAC specifies a computer, an approved webcam, a private location and at least 2 Mbps upload and download speed; phones and tablets are not allowed. At a testing center, two government-issued IDs are required, including one photo ID.

To understand what the 75% threshold means in practice, read our breakdown of the CIES passing score, and for a candid look at difficulty, see how hard the CIES exam is.

Who Can Apply

The word "Supervisor" in the title is backed by real experience requirements. ACAC offers three pathways:

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.

Across any pathway, experience must cover at least three of five areas: asbestos, lead, hazardous materials, microbial/allergens, and IH/chemicals/toxicology. ACAC requires actual field experience, and the application includes four project sheets, educational evidence where applicable and experience verification. Each project sheet describes the problem, the applicant's own responsibilities and actions, and the outcome, so write them in terms of what you did rather than what your crew did.

One more distinction matters. Taking an examination solely to satisfy a state licensing rule is not the same as earning ACAC CIES certification; a licensing-only exam result does not itself confer the credential.

Costs, Term Length and Renewal

ACAC publishes a single fee schedule, with no separate member and non-member pricing:

The certification term is two years. Current recertification procedures call for 40 recertification credits: 10 for continued field activity and 30 for professional development during the term. Candidates attest to the credits and retain evidence in case of audit. ACAC's materials are not perfectly consistent here, since the candidate handbook gives a general 40-credit figure and a program page mentions 20 professional-development hours annually, so follow the current Recertification Procedures page. For the full financial picture, see our CIES certification cost breakdown.

There is also an unresolved timing conflict on applications. The current application page describes online submission with email verifications and a six-month window including the examination, while the handbook gives 90 days and describes notarized forms and employer affidavits. Confirm which applies to you before you start, and use our CIES exam dates guide to plan scheduling.

How CIES Differs From Related Credentials

Because the title is broad, it helps to know what it is not. ACAC also offers narrower remediation credentials, such as a mold-focused certification. The practical difference is scope: the supervisor credential spans asbestos, lead, hazardous materials, microbial contaminants and chemicals, whereas single-discipline credentials concentrate on one hazard family and carry different experience requirements. Choose based on the work you actually direct.

Florida adds another layer. The state's licensing regulator has been reported to list this credential among accepted mold-remediation examinations, but the regulator's page could not be directly retrieved for verification. Even where an approved exam counts, it is only one part of licensing; separate application, education and experience, fingerprinting and insurance requirements also apply. State licensing eligibility and ACAC certification eligibility are distinct questions, so confirm current rules directly with the regulator.

Where the Title Gets Used

Holders of a supervisor-level indoor environmental credential typically work where contamination has to be assessed, contained and cleared: remediation contractors, environmental consulting firms, facilities and property management organizations, and public-sector building programs. The credential signals that the person directing a job understands engineering controls, removal methods, worker safety and the regulatory framework behind each.

On earnings, be cautious. No reliable salary survey specific to ACAC CIES holders was verified, and no causal pay premium has been established, so treat any specific dollar figure attached to the title with suspicion. Our CIES salary guide and ROI analysis discuss how to evaluate value without invented numbers, and CIES jobs covers the roles where the credential appears.

Likewise, no numerical 2025 or 2026 pass rate has been verified. ACAC's 2025 activity report shows dashes for applicants and pass ratio for this credential, which is not the same as a 0% pass rate, and historical figures from 2024 conflict with each other and rest on very small candidate counts. Our CIES pass rate article explains the data gaps.

Where to Go From Here

Now that the acronym is settled, a sensible sequence is: confirm you meet an eligibility pathway, then build your preparation around the five competencies. If you have a background in one hazard area, schedule the other four before your strongest one. Spend early study time on the competencies where you have the least field exposure, usually the regulatory-heavy ones like asbestos and lead, and leave your home discipline for review.

When you are ready to test your knowledge, the CIES practice test site offers question practice aligned to the five competency headings, and our CIES training overview explains how to think about preparation resources. ACAC does not develop or administer preparation courses, and no mandatory training-hour requirement is published, so your preparation path is up to you. You can also review the general CIES certification page or return to the main practice platform at any point.

Frequently Asked Questions