Maryland RegulationsIntermediate 30 min read

Maryland Water Treatment Class 1-5: Surface Water Plants, WSSC & Baltimore

The core study guide for Maryland's numbered Water Treatment classes (1 through 5), covering conventional filtration, WSSC Water and Baltimore's reservoir-fed systems, watershed protection, and disinfection byproduct control.

Overview

Above Maryland's entry-level Class G (no chemical treatment) and Class D (chlorination only) certifications sits the numbered ladder: Class 1 through Class 5, per COMAR 26.06.01, Table 7. These classes correspond to increasingly complex treatment plants, culminating in Class 5, the certification required at Maryland's largest conventional filtration plants.

The Class Ladder in Context

Class 1: first numeric class, typically small-to-moderate systems adding basic filtration beyond simple chlorination.
Class 2: moderately complex treatment systems.
Class 3: larger systems, approaching conventional filtration plant scale.
Class 4: advanced conventional filtration plants with significant capacity.
Class 5: the state's largest, most complex plants -- WSSC's Potomac

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