The Complete REHS Exam FAQ

Every question we get asked about the California REHS exam, credential, and career, answered in one place with sources.

This page pulls together the questions candidates ask us most, with straight answers and no filler. Where a figure could change (fees, dates, policy details), we've said so and pointed you to the authoritative source. Use the categories below to jump to what you need.

The basics

What is a Registered Environmental Health Specialist (REHS)?

An REHS is a credentialed professional who inspects and regulates environmental health risks: food facilities, water systems, housing, land use, hazardous materials, and more. In California, CDPH issues the credential after a candidate meets education and experience requirements, passes the state exam, and completes registration.

Who administers the California REHS exam?

The California Department of Public Health's Environmental Management Branch. This is separate from NEHA, the organization that administers a similarly named national credential used by other states. More on that distinction in the California vs. national exam section below.

Exam format & scoring

How many questions are on the exam?

260 multiple-choice questions, administered as two separate 130-question booklets rather than one continuous test, spanning 17 content modules.

How long do I have to complete it?

The time limit is set per exam date and stated on your official CDPH admission materials. Don't rely on a specific number from any prep site (including a previous version of this one) until you've confirmed it against your own admission materials.

What's the passing score?

There isn't one fixed number used across every exam form. CDPH sets a pass point per form using a modified Angoff method, where subject matter experts rate how a minimally competent, entry-level REHS would perform on each question. Published pass points typically land in the 60–70% range of items correct, shifting slightly by form. You don't need a perfect score, and getting a meaningful chunk of questions wrong is still compatible with passing.

What are the 17 exam modules?

They span food protection, housing, water quality, recreational health, land use, hazardous materials, vector control, and related environmental health program areas, with roughly 14–20 questions per major module and 6–10 per specialized module. See REHS Exam: The 17 Modules You Need to Master for the full breakdown.

Fees & logistics

How often is the exam offered?

Three times a year: March, July, and November, at sites in the Sacramento and Santa Ana areas. Confirm current dates on CDPH's REHS program page, since scheduling can shift.

What does the whole process cost, start to finish?

Budget for several separate fees: a transcript evaluation through CPS HR Consulting (currently around $245), the CDPH registration application ($178), the exam itself ($235, non-refundable), and the initial registration fee after passing ($327). A $35 handling fee applies if you fail to cancel or show up for a scheduled exam. All figures should be confirmed on CDPH's current site, since they're periodically updated. Our full application walkthrough covers the sequence in detail.

Retakes & results

What happens if I fail?

You get an immediate pass/fail result at the testing center, without detailed feedback on individual questions.

How long do I have to wait before retaking it?

Under AB 1288, effective January 1, 2026, there's a 90-day waiting period before you can retake the exam. This replaced the older rule that allowed two attempts before a longer mandatory wait. Confirm the current process with CDPH before planning around a specific retake date.

What are the most common reasons candidates fail?

Pacing and preparation habits more often than raw knowledge gaps. We cover the recurring patterns in Common REHS Exam Mistakes and How to Avoid Them.

California vs. national exam

Is the California exam the same as NEHA's national REHS/RS exam?

No. They're administered by different organizations, test different content, and use different scoring systems. Fifteen states use NEHA's national exam instrument for their own licensing; California is not one of them and runs its own independent, CDPH-administered exam. Full comparison in California REHS vs. the National NEHA Exam.

Does an out-of-state or NEHA credential transfer to California?

Generally, no, not through NEHA's standard reciprocity process, which explicitly excludes California exams taken after August 1992. If you're relocating with an existing credential, contact CDPH's EHS Registration Program directly at REHSprog@cdph.ca.gov to confirm your specific situation.

Eligibility & path

Do I need a college degree?

Yes. California's eligibility path requires a bachelor's degree with qualifying science coursework, evaluated by CPS HR Consulting on CDPH's behalf, plus supervised field experience, before you can sit for the exam.

What's the difference between an EHS Trainee and an Assistant Environmental Health Specialist?

EHS Trainee is a state-defined status tied to holding a CDPH Letter of Eligibility. Assistant Environmental Health Specialist is a county-level job classification some counties use as a holding tier for candidates who haven't received that letter yet. Full breakdown in EHS Trainee vs. Assistant EHS.

Can I use the title "REHS" before I'm registered?

No. Passing the exam doesn't make you a Registered Environmental Health Specialist by itself. You need to complete formal registration and receive your certificate from CDPH first. Using the title or "R.E.H.S." before that point is a misdemeanor under California Health and Safety Code Section 106735.

Do I have to renew my registration?

Yes, every two years. The renewal fee is $327, with a $163 late fee if you miss the deadline, plus completing your continuing education hours. Details in After You Pass: REHS Renewal & CE Guide.

Career & salary

How much does an REHS earn in California?

It varies significantly by county and level. Entry-level Assistant EHS positions typically start in the low-to-mid $60,000s and can reach the low $80,000s; a real 2026 Orange County posting listed $29.48–$39.74/hour. Senior and supervising REHS roles in higher-paying counties can clear $140,000, based on actual California public payroll records. Full breakdown, with sources, in REHS Salary and Career Path in California.

How long does it take to become an REHS?

It varies, but candidates typically spend one to two years as an EHS Trainee or Assistant Environmental Health Specialist accumulating required field experience, on top of completing a qualifying degree, before they're eligible to test.

Studying & materials

What study material should I use?

Something built specifically around California's exam scope, not adapted from NEHA's national content, since the two exams test different regulatory frameworks. Look for material that references CalCode and CCR Titles 17 and 22 directly.

How long should I study?

Most candidates use a structured plan of around 12 weeks, adjusted based on a diagnostic pretest score. See 12-Week REHS Exam Study Plan That Works for a week-by-week breakdown.

What does REHS prep actually cost across the different formats?

It ranges from roughly $20 for short-term practice-question access up to $500+ for an in-person course plus study guide. Full pricing breakdown, by format, in PassREHS vs. Other REHS Prep Options.

Still have a question?

Email us at info@passrehs.com and we'll get back to you, or add it to this page if it's one other candidates are likely asking too.