Colorado Regulation 100Intermediate 25 min read

Colorado Regulation 100: Process Control Basics

How Colorado's classification matrix actually assigns a class to a facility or distribution system, how the certification exam and application process work, and what renewal looks like at the Class C / Class 2 level.

Passing your Class D or Class 1 exam taught you that facilities get classified and operators get certified — but at the Class C / Class 2 level, the exam expects you to actually work the classification logic yourself: given a flow rate and a treatment process, or a population and a set of complexity factors, what class does this system land in, and what does that mean for who can legally run it? This guide walks through the mechanics Regulation 100 actually uses.

The Water Treatment Classification Matrix, in Practice

Regulation 100 section 100.4 classifies water treatment facilities using a matrix, not a simple point total. The two inputs are:

Plant design flow rate, sorted into three bands:

Less than 350 GPM
350–1,400 GPM
More than 1,400 GPM

Treatment process(es) employed — each recognized treatment technology (e.g., disinfection-only, filtration,

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