CO Wastewater Treatment Operator TU Requirements

The short version

Colorado counts training units — TUs. One TU is ten contact hours, and how many you owe depends on which certificate you hold and at what class. There is no single Colorado number:

Two ladders, running in opposite directions: treatment runs D up to A (A is the highest), collection runs 1 up to 4 (4 is the highest). Industrial wastewater treatment uses the same D–A ladder and the same numbers.

One oddity worth knowing: Class S — the entry-level hybrid certificate for systems serving 3,300 or fewer people — requires 1.8 TUs, more than a Class D or Class 1 at 1.2. The operator at the smallest plant in the state owes 50% more CE than a Class D holder. The Board set it that way deliberately.

What counts: the 50/50 rule

Colorado approves courses in five categories: water treatment, domestic wastewater treatment, industrial wastewater treatment, distribution system, and collection system.

• At least half of a certificate's TUs must come from courses approved in that certificate's own category.
• Up to half may come from courses approved in any other category — including "supplemental training," the Board's label for courses that are useful but not directly related to facility operations.

Note the structure: supplemental training doesn't get its own separate cap. It shares the same 50% out-of-category bucket with cross-discipline courses. Spend that allowance on a first-aid course and you can't also spend it on a collection course.

The Board's own catalog labels are core training (mechanical/electrical/ hydraulics, treatment processes, testing and disinfection, regulatory compliance) and supplemental training — those are the words you'll see when you search the course catalog.

The mandatory regulatory course — inside your total, not on top

Every renewal requires a completed, approved Mandatory Regulatory Training (MRT) course. Each completion is valid three years, and an application without one is incomplete.

The part people get backwards: the MRT's training units count toward the totals in the table above, not in addition to them. It's a gate, not an extra line item.

A single wastewater MRT covers wastewater treatment, industrial wastewater, and collection certificates. Free on-demand versions are published by CDPHE through Indigo Water Group.

If you hold more than one certificate

Colorado works differently from any other state we've verified:

• Each certificate carries its own full TU requirement. No reduction, no single shared set.
• But the same course can count toward more than one certificate, if the course is approved in each of those categories.
• And each certificate still needs its own 50% in-category floor.

Worked example — Class B treatment (2.4 TU) plus Class 3 collection (2.4 TU):

Twenty-four hours of training can satisfy both certificates — if it's split evenly by category. Take all 24 hours in treatment courses and the collection certificate fails its in-category floor even though your hour total looks fine. (This is our reading of how the rule's clauses interact; the Board doesn't publish a worked example. When in doubt, ask the program office.)

Sub-hour courses round down hard

Minimum course length for credit is 30 minutes:

A 40-minute course is worth half an hour, not two-thirds.

And one that pays the other way: teaching an approved classroom course earns double the course's TU value — but only the first presentation per year under a given course approval number. Repeats earn nothing.

Cycle, deadlines, and the rule that bites

• Three-year cycle, staggered per operator. No statewide renewal date.
• A new certificate runs three years from your certification eligibility letter.
• A renewed certificate runs three years from the prior certificate's expiration date — not from when you actually renewed. Renew four months late and those four months are permanently gone from the new term.
• Renewal is filed in the CCWP Portal and reviewed in roughly ten business days, so apply with review time to spare.

If you miss your expiration:

Carryover and repeats

• No carryover between three-year periods; extra TUs are lost. One narrow exception: units earned after an expiration that weren't used to restore the lapsed certificate may be applied to the following renewal.
• A course counts once per category. You affirm on the renewal application that you're not reusing credits, and reuse is grounds for discipline up to revocation.
• Courses used to qualify for an entry-level certificate (D, 1, S) can't be reused to renew that same certificate.

Who holds the record

Colorado tracks your TUs for you, and renewal runs through it. Instructors upload TUs into your CCWP Portal account against your Operator ID — but the units don't attach themselves: you have to claim them.

Colorado puts no record-retention duty on the operator that we could find — the state holds the ledger. So your job here isn't warehousing paper for an auditor; it's confirming that every course actually posted and got claimed. A TU an instructor never uploaded, or you never claimed, is invisible until renewal review — which is exactly the wrong time to find out. Keep your own copy of each completion certificate for that conversation.

Out-of-state and unapproved courses

The Board pre-approves courses and publishes TU values in a searchable catalog. Took a course that isn't on it — typically out-of-state training? You can submit the course details with a fee for individual review. Approval then applies only to you, not to the course generally.

Water vs. wastewater

Same board, same Regulation 100, same TU table — water treatment uses D–A and distribution uses 1–4 with identical amounts. Two class letters need care: Class S exists on both sides (Small Water System and Small Wastewater System are separate certificates, both 1.8 TUs), and Class T is drinking water only — it has no wastewater counterpart.

Fees

We're deliberately not printing dollar amounts: Colorado raised program fees in a 2023 rulemaking and the published figures floating around predate it. Get current amounts from the CCWP office — (719) 225-7339, info@coloradocwp.com.

Where WaterCEU fits

We're not a course provider, and we'll be straight about Colorado: the CCWP Portal already holds your TU ledger and gates your renewal, so we're not filling the hole we fill in states with no tracking at all.

What's genuinely useful here is narrower and real. If you hold more than one certificate, the portal shows you a balance — it doesn't tell you whether that balance satisfies each certificate's own in-category floor. Tracking your courses by category against both requirements is exactly what the app's category tracking does. And your own copy of every completion certificate is what settles it when a TU was never uploaded or never claimed.

Sources

5 CCR 1003-2 (Regulation No. 100), § 100.16 — renewal, expiration, and training units, under the regulation's current numbering.

• CDPHE, CCWP certificate renewal (TU table): https://cdphe.colorado.gov/ccwp-certificate-renewal
• CDPHE, CCWP program: https://cdphe.colorado.gov/ccwp-program
• Rule text (current numbering): https://www.law.cornell.edu/regulations/colorado/5-CCR-1003-2-100.16
• Course catalog: https://portal.coloradocwp.com/External/Pages/CourseCatalog/Operator/CourseCatalogSearch.aspx
• CCWP Portal: https://portal.coloradocwp.com/
• CCWP office: (719) 225-7339, info@coloradocwp.com

Verified against the above on August 31, 2026.

WaterCEU is not affiliated with CDPHE, the Water and Wastewater Facility Operators Certification Board, or Colorado Rural Water Association. We are not a continuing education provider and we do not award training units. This page is a plain-language summary of a published regulation, not compliance or legal advice. Rules change — confirm your own requirements with the CCWP program before you rely on them.