Numbers in brackets link to the official sources listed under Sources & last verified. Dates that have passed are removed automatically.
| Item | Detail | Source · Verified |
|---|---|---|
| Number of questions (Grade 4) | 85 questions (1 point each)[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Number of questions (Grades 1–3) | 100 questions (1 point each)[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Time limit | 3 hours[2] | California Water Environment Association · Oct 21, 2026 |
| Exam fee (Grade 2) | $247 member / $506 non-member[3] | California Water Environment Association · Oct 21, 2026 |
| Exam fee (Grade 3) | $262 member / $521 non-member[3] | California Water Environment Association · Oct 21, 2026 |
| Exam fee (Grade 4) | $277 member / $536 non-member[3] | California Water Environment Association · Oct 21, 2026 |
| Retake policy | Retest application; skip at least one exam window[4] | California Water Environment Association · Oct 21, 2026 |
| Validity | 1 year, renewed annually[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Delivery | Pearson VUE test center or OnVUE online proctoring[2] | California Water Environment Association · Oct 21, 2026 |
| Eligibility (Grade 1) | No requirements (1 year of experience recommended)[5] | California Water Environment Association · Oct 21, 2026 |
| Eligibility (Grade 2) | 2 years' experience, or 1 year + bachelor's degree[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Eligibility (Grade 3) | Grade 2 cert + 4 years (or 3 with associate / 2 with bachelor's)[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Eligibility (Grade 4) | Grade 3 cert + 6 years (or 5 with associate / 4 with bachelor's) + supervision[1] | cweawebstorage1.blob.core.windows.net · Oct 21, 2026 |
| Score release | Instant on-screen result[4] | California Water Environment Association · Oct 21, 2026 |
According to California Water Environment Association, “Each question is worth 1 point. Total points possible for each exam are as follows: Grade 1 – 100 points Grade 2 – 100 points Grade 3 – 100 points Grade 4 – 85 points”[1]
The California Water Environment Association (CWEA) offers the Environmental Compliance Inspector certification. Candidates take the test at a Pearson VUE center or via OnVUE online proctoring, with a 3-hour time limit. The exam consists of 100 questions for Grades 1, 2, and 3, and 85 questions for Grade 4, with each question worth 1 point. After submitting, candidates receive an instant on-screen result.Eligibility varies by level. Grade 1 requires no prior experience, though 1 year is recommended. Grade 2 requires 2 years of experience, or 1 year combined with a related bachelor's degree. Grade 3 requires a Grade 2 certification plus 4 years of experience (or 3 years with an associate degree, or 2 years with a bachelor's degree). Grade 4 requires a Grade 3 certification, 6 years of experience (or 5 with an associate, 4 with a bachelor's), and 1 year of supervisory experience.Exam fees differ based on membership status and level. For Grade 2, the fee is $247 for members and $506 for non-members. Grade 3 is $262 for members and $521 for non-members, while Grade 4 is $277 and $536. If a retake is necessary, candidates must submit a retest application and skip at least 1 exam window. Certifications expire after 1 year and must be renewed annually.The content areas below are copied from the official Environmental Compliance Inspector content outline published by California Water Environment Association. The right-hand column shows which of our practice sets covers it.
| Official content area | Practice on this site |
|---|---|
| Domain 6: Math[1] | Start Practice Test Practice calculations related to flow rates, concentration limits, and environmental compliance metrics. |
Prepare for the Environmental Compliance Inspector exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.
These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.
Question: Under EPCRA Section 313, what form must facilities submit annually to report releases of toxic chemicals to the environment?
Answer: A. EPA Form R (Toxic Chemical Release Inventory)
Explanation:
Correct Answer: AEPA Form R is the correct submission required under EPCRA Section 313 for facilities reporting annual toxic chemical releases to the environment. Option B (EPA Form 8700-12) is incorrect because it is used for RCRA notification activities, not EPCRA reporting. Option C (SF-299) applies to transportation applications, which are unrelated to toxic release inventories. Option D (EPA Form 3520-1) is used for vehicle emissions under the Clean Air Act, not facility release reporting. Remember that EPCRA Section 313 specifically mandates the Toxic Chemical Release Inventory, which relies on Form R for compliance.Question: Which of the following is classified as a 'criteria pollutant' under the NAAQS framework?
Answer: C. Particulate matter (PM2.5)
Explanation:
Correct Answer: CParticulate matter (PM2.5) is designated as a criteria pollutant under the NAAQS framework. Options A and B (benzene and mercury) are incorrect because the EPA classifies them as hazardous air pollutants, which are regulated under different standards rather than the core NAAQS criteria list. Option D (hydrogen sulfide) is also not one of the designated criteria pollutants. When reviewing air quality regulations, remember that the NAAQS specifically covers a limited list of criteria pollutants like PM2.5, while toxics like mercury fall under separate hazardous emission standards.Question: Which U.S. agency has primary oversight of the federal Underground Storage Tank program?
Answer: A. U.S. Environmental Protection Agency (EPA)
Explanation:
Correct Answer: AThe U.S. Environmental Protection Agency (EPA) is the correct agency, as it oversees the federal Underground Storage Tank (UST) program established under Subtitle I of RCRA. Option B (OSHA) is incorrect because it focuses on workplace safety and employee health, not environmental storage tank compliance. Option C (DOT) governs the transportation of hazardous materials in commerce, not stationary underground tanks. Option D (U.S. Army Corps of Engineers) manages navigable waters and wetlands, not USTs. A general rule for environmental compliance is that stationary hazardous storage programs typically fall under EPA jurisdiction unless delegated to state authorities.How we verify: editorial & fact-checking policy. Report an error: contact us.
Candidates have a 3-hour time limit to complete the exam. This applies whether you test at a Pearson VUE center or through OnVUE online proctoring.
Grades 1, 2, and 3 contain 100 questions. The Grade 4 exam contains 85 questions. Each question is worth 1 point toward your final score.
You will receive an instant on-screen result immediately after you submit the exam, before you leave the Pearson VUE center or close your OnVUE session.
If you do not pass, you must submit a retest application. The CWEA requires candidates to skip at least 1 exam window before they are eligible to test again.
No, the Grade 1 exam is entry-level and has no strict requirements, meaning anyone can take it. However, the CWEA recommends having 1 year of experience.