Welcome To Indigo Water Group, LLC

626 West Davies Way
Littleton, Colorado 80120
Office   303.489.9226

Our Online Training Has Changed

iSpring Market vs iSpring Learn

Online Training Has Moved

New Web Address:

Wastewater Exam Cram

Our popular Wastewater Exam Cram is back and it’s better than ever!
March, July, and October 2023
Up to Four Full Days – $175 per day or $600 for all four days.

Advanced Activated Sludge & Nutrient Removal

Learn through advanced computer simulations!
May 17 – 18, 2023 and August 23 – 24, 2023
$400 (includes simulator trial)

Activated Sludge Microbiology

Hands on Microbiology / Microscopy Class
June 6 – 7, 2023
$495 (bring your microscope for a $50 discount)

Collection Systems Cram

February 22 – 23, 2023

Online Training

Indigo Water Group offers a wide variety of training options to meet your needs.

Online, open-enrollment classroom style courses, and customized on-site training.

Become An Operator

You can become a certified operator.
Municipal Wastewater, Industrial, Drinking Water, Collections, or Distribution
Let us help you!


If you are not familiar with our company and your first contact with us is online: We would be pleased to hear from you! Please let us know what your needs and questions are. We are happy to help.

Check out our latest and most exciting project!  We’ve written new operator training manuals for Water Environment Federation. You can find the manuals in the WEF bookstore.


Please take a moment to read our Privacy Policy.

Exam Prep Help

Under the Downloads section, you’ll find FREE sample test questions and math workbooks created by our staff.  Get the PEST software and get prepared for upcoming certification exams!

Check out our Excel spreadsheet that generates new problems on the fly.

Practice questions for Colorado Drinking Water Regulations.

Flash Cards.

Upcoming Training

2023 Training Dates

  • May 17 – 18, 2023 – Activated Sludge & Nutrient Removal (Highlands Ranch)
  • June 6 – 7, 2023 – Wastewater Microbiology & Microscopy (Highlands Ranch)
  • July 19 – 20, 2021 – CRWA and Indigo Workshop (Ignacio)
  • July 25 – 28, 2023 – Wastewater Exam Cram (Grand Junction)
  • August 23 – 24, 2023 – Activated Sludge & Nutrient Removal (Highlands Ranch)
  • October 24 – 27, 2023 – Wastewater Exam Cram (Highlands Ranch)
  • On Demand Online Courses
  • Customized On-Site Training

Register Today!