Original Questions Only
Official question banks are confidential and released only to approved test providers. We don't copy, reconstruct or buy them. We write our own questions to test the same knowledge, based on the published regulation and the regulator's topic lists.
Primary Sources First
We check every fact against a primary source, such as the eCFR text of 40 CFR Part 82, EPA pages or state licensing boards. Each page lists its sources and each question cites a rule. If information comes from a secondary source, such as trade press, we say so on the page.
Technical Review
We plan for a licensed or certified practitioner to review every page. Until a named reviewer is confirmed, each page says the review is pending. We won't show reviewer names or credentials that haven't been verified.
Updates and Corrections
Each page shows a "Last updated" date. When rules or exams change, we revise the affected pages. If you find an error, tell us through our contact page. We'll fix confirmed errors and update the date.
Advertising and Products
Our free practice tests stay free. Paid products, such as an expanded test bank, will follow the same standards.