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Drinking Water Treatment and Distribution:

Removal and Regrowth of Bacteria

Assessments of Water Treatment Plant Performance

and Distribution System Water Quality


The attached report is a consolidation of four separate seasonal assessments of the performance of the Capital City Water Treatment Plant, Jefferson City, Missouri, in removing microorganisms and particles of potential heath significance from its Missouri River source.


In addition to traditional measures of drinking water treatment plant performance (turbidity, total coliform, heterotrophic plate counts), direct microscopic observations were made to quantify total bacterial cell removal as well as regrowth during distribution under both summer and winter conditions.


In addition, the treatment plant performance was assessed with respect to the removal of particle-associated bacteria (PAB), nematodes, and carbon 'fines' .


By all measures, microorganism removals were observed to be significantly impaired when water temperatures were low.