Wastewater operator CEU course

The Combined Wastestream Formula

Approved for renewal credit in Illinois

Misunderstanding how dilution and production limits work can cause permit violations in industrial pretreatment programs. This hour explains the Combined Wastestream Formula so you can correctly calculate discharge limits and explain dilution rules to industrial users and coordinators.

Course summary, as it appears on your certificate

To provide operators with a clear understanding of the Combined Wastestream Formula (CWF) under 40 CFR 403.6(e), emphasizing its regulatory context, practical application, and operational implications, enabling them to accurately interpret, apply, and communicate about production-based limits and dilution restrictions in pretreatment programs.

Level 2 — what each change does to the plant — effluent, efficiency, sludge and energy — assumes Level 1

Credit awarded: 1 hour — Technical

The Illinois course number is issued by the Agency for this course and is printed on your certificate.

Reviewed by: Robert Risley, Class 1 Wastewater Operator — reviewed November 2026

AquaCert does not mark its own homework: a licensed operator reviews the content and the course cannot be sold while that review is out of date.

One hour of study is one hour of credit. Your certificate reports the hours, which is what Illinois records against your renewal.

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What's included

• ✓ Self-paced online coursework you can start, pause, and resume anytime
• ✓ Short questions along the way, and a short final quiz to pass for your certificate (retake it as often as you need)
• ✓ An official certificate of completion (PDF) with a public verification code
• ✓ Progress saved to your My Learning dashboard