Maryland
Certifying agency: Maryland Department of the Environment (MDE).
Wastewater operator certification in Maryland is administered by the Maryland Department of the Environment (MDE).
To study for your exam: request the current certification study guide and exam application from the agency's water/wastewater operator certification program, then check whether your state accepts the ABC (Association of Boards of Certification) standardized exam or uses its own state-specific test.
Most states require documented supervised operating experience plus a passing exam score for each certification grade, and require continuing education hours to renew — check the agency site for exact hour requirements and approved training providers.
Local rural water associations, community colleges, and state operator associations frequently offer exam-prep courses recognized by the certifying agency — the agency's site typically lists approved trainers.
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