Approved Environment, Inc. water and wastewater operator training
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Online Water and Wastewater Continuing Education

Professional online courses, wastewater certification review classes, practice exams, and study materials for water and wastewater operators.

Create Your Own CE Package Browse Individual Courses Prepare for Certification

Operator Training Since 1998

Approved Environment, Inc. helps water and wastewater professionals maintain their licenses, strengthen plant-operating knowledge, and prepare for certification examinations. Courses include practical explanations, diagrams, photographs, and treatment-plant applications you can study at your own pace.

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Create Your Own CE Package

Select the individual courses you need, register once, and pay for the entire package in one transaction.

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Returning student

Continue a Course

Resume a course you already started using your existing login information.

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Exam preparation

Certification Practice Exams

Practice multiple-choice questions and prepare for your state wastewater certification exam.

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Study guide

Wastewater Review Book

Use the complete wastewater certification review book as a focused exam-preparation resource.

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Approved Online Courses by State

Select your state to review available water and wastewater continuing education courses. When a state is not listed, verify acceptance with the appropriate state certification authority before enrolling.

Alabama Arizona Alaska California Delaware Indiana Wastewater Indiana Water Illinois Ohio Idaho North Carolina South Carolina Nevada Maryland Louisiana Tennessee Virginia West Virginia Washington Wisconsin

Continuing Education Packages

We’ve bundled our best courses into convenient Continuing Education Packages. Course bundles offer great savings, or you can create your own package by selecting the courses you need.

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Wastewater Certification Review Classes

Prepare for municipal, industrial, activated sludge, laboratory, and mathematics-related certification topics. These review classes may also provide continuing education credit where approved.

See All Certification Review Classes

Individual One-Hour Courses

Order individual courses and pay as you go. Each listed course provides one contact hour. Click a course title to read its description and registration information.

Course types: W = Water, WW = Wastewater, WD = Well Driller, PI = Pump Installer. Log in to one course at a time; completion dates and times are recorded on the certificate.

Learn how the online courses work →

CourseCategoryTypeCreditPrice
Activated Sludge ITechnicalWW1 hour$20
Activated Sludge IITechnicalWW1 hour$20
Aerobic and Anaerobic Sludge DigestionTechnicalWW1 hour$20
Ammonia, pH and ChlorineTechnicalW & WW WD PI1 hour$20
Air Stripping and Carbon AdsorptionGeneralW & WW1 hour$20
BOD, DO and CODTechnicalW & WW1 hour$20
Biological Nitrogen RemovalTechnicalWW1 hour$20
Biochemical Oxygen Demand Concept and TreatmentTechnicalW & WW1 hour$20
Chemistry I/Water ChemistryTechnicalW & WW WD PI1 hour$20
Chemistry II/The Periodic TableTechnicalW & WW1 hour$20
Clarifiers OptimizationTechnicalW & WW1 hour$20
Disinfection by ChlorineTechnicalW & WW WD PI1 hour$20
Drinking Water ProductionTechnicalWater Only1 hour$20
FiltrationTechnicalW & WW1 hour$20
Final Effluent ITechnicalWW1 hour$20
Final Effluent IITechnicalWW1 hour$20
Industrial Waste Treatment ITechnicalWW1 hour$20
Industrial Waste Treatment IITechnicalWW1 hour$20
Laboratory Procedures For Plant ControlTechnicalWW1 hour$20
Laboratory Terms, Equipment and SamplingTechnicalW & WW1 hour$20
Maintenance I/Boiler Feed WaterGeneralW & WW1 hour$20
Maintenance II/PumpsTechnicalW & WW WD PI1 hour$20
Membrane TechnologyTechnicalW & WW1 hour$20
Multiple Choice QuestionsTechnicalWW1 hour$20
Odor ControlGeneralW & WW1 hour$20
Operation and Control of a Wastewater Treatment PlantTechnicalWW1 hour$20
Ozone DisinfectionTechnicalW & WW1 hour$20
Parasites and PathogensTechnicalW & WW WD PI1 hour$20
Primary TreatmentTechnicalW & WW1 hour$20
Removing Metals from WastewaterTechnicalWW1 hour$20
SafetyGeneralW & WW WD PI1 hour$20
Settleability and Loss of SolidsTechnicalW & WW1 hour$20
Sludge Stabilization Versus Sludge ConditioningTechnicalWW1 hour$20
Solids DewateringTechnicalWW1 hour$20
Solids Handling Alternatives/CentrifugationTechnicalWW1 hour$20
The MicrolifeTechnicalW & WW WD PI1 hour$20
Trickling Filters and RBCsTechnicalWW1 hour$20
UV DisinfectionTechnicalW & WW1 hour$20
Understanding Wastewater MathematicsTechnicalWW1 hour$20
Wastewater Mathematics Practice ProblemsTechnicalWW1 hour$20
Wastewater Preliminary TreatmentTechnicalWW1 hour$20
H1 N1 FluGeneralWater Only1 hour$20
Waste Disposal ManagementGeneralWW1 hour$20
Environment and Health in Developing CountriesGeneralW & WW1 hour$20
Oxidation DitchesTechnicalWW1 hour$20
Ground Water and WellsTechnicalW & WD PI1 hour$20
Sequencing Batch Recators (SBRs)TechnicalWW1 hour$20
Package PlantsTechnicalWW1 hour$20
Basic MathematicsTechnicalW & WW1 hour$20
Advanced MathematicsTechnicalW & WW1 hour$20

Wastewater Certification Review Textbook

$75 plus shipping and handling. The complete review book is designed to help operators prepare for wastewater certification examinations.

“Your Wastewater Certification Guide is fantastic. I’ve ordered three different guides, and yours is the best by far.”
“Your training was top notch, your website is top notch, and your support is the best I’ve ever experienced.”
“Justin Popen Jan 22, 2023 Their test review book helped me pass my Class IV and D highly recommend.”
Order from the Bookstore
Wastewater Certification Review textbook

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Corporate Accounts

Businesses, municipalities, and corporations are welcome. Contact us to discuss group training and account setup.

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Build Your Water or Wastewater Training Plan

Choose individual courses, a ready-made continuing education package, or create your own package and pay for all selected courses in one payment.

Create Your Own Package View Individual Courses